# Meson Particle Listings

## ρ(770)

¹A combined fit of AKHMETSHIN 07, AULCHENKO 06, and AULCHENKO 05.

²Using the GOUNARIS 68 parametrization with the complex phase of the ρ-ω interference.

³From a fit in the energy range 0.61 to 0.96 GeV. Update of AKHMETSHIN 02.

⁴Supersedes ACHASOV 05A.

⁵Using the data of BARKOV 85 in the hidden local symmetry model.

<table><thead><tr><th>Γ(π<sup>+</sup>π<sup>-</sup>π<sup>+</sup>π<sup>-</sup>)</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th><th>Γ<sub>14</sub></th></tr></thead><tbody><tr><td>• • • We do not use the following data for averages, fits, limits, etc.</td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>2.8 ±1.4 ±0.5</td><td>153</td><td>AKHMETSHIN 00</td><td>CMD2</td><td>0.6-0.97 e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup> π<sup>-</sup> π<sup>+</sup> π<sup>-</sup></td><td></td></tr></tbody></table>

## ρ(770) Γ(e<sup>+</sup>e<sup>-</sup>)Γ(i)/Γ<sup>2</sup>(total)

<table><thead><tr><th>Γ(e<sup>+</sup>e<sup>-</sup>)/Γ<sub>total</sub> × Γ(π<sup>+</sup>π<sup>-</sup>)/Γ<sub>total</sub></th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th><th>Γ<sub>12</sub>/Γ × Γ<sub>6</sub>/Γ</th></tr></thead><tbody><tr><td>4.89 ±0.04 OUR AVERAGE</td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>4.889 ±0.015 ±0.039</td><td>1 ACHASOV</td><td>21</td><td>SND</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup> π<sup>-</sup></td><td></td></tr><tr><td>4.876 ±0.023 ±0.064</td><td>800k 2,3 ACHASOV</td><td>06</td><td>SND</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup> π<sup>-</sup></td><td></td></tr></tbody></table>

• • • We do not use the following data for averages, fits, limits, etc.

4.72 ±0.02 4 BENAYOUN 10 RVUE 0.4-1.05 e<sup>+</sup> e<sup>-</sup>

¹From a fit of the cross section in the energy range 0.525 < $\sqrt{s}$ < 0.883 GeV parameterized by the sum of the Breit-Wigner amplitudes for the ρ(770), ω and ρ(1450) resonances.

²Supersedes ACHASOV 05A.

³A fit of the SND data from 400 to 1000 MeV using parameters of the ρ(1450) and ρ(1700) from a fit of the data of BARKOV 85, BISELLO 89 and ANDERSON 00A.

⁴A simultaneous fit of e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup> π<sup>-</sup>, π<sup>+</sup> π<sup>-</sup> π<sup>0</sup>, π<sup>0</sup> γ, ηγ data.

<table><thead><tr><th>Γ(e<sup>+</sup>e<sup>-</sup>)/Γ<sub>total</sub> × Γ(ηγ)/Γ<sub>total</sub></th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th><th>Γ<sub>12</sub>/Γ × Γ<sub>9</sub>/Γ</th></tr></thead><tbody><tr><td>1.42 ±0.10 OUR FIT</td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>1.45 ±0.12 OUR AVERAGE</td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>1.32 ±0.14 ±0.08</td><td>33k</td><td>1 ACHASOV</td><td>07B</td><td>SND</td><td>0.6-1.38 e<sup>+</sup> e<sup>-</sup> → ηγ</td></tr><tr><td>1.50 ±0.65 ±0.09</td><td>17.4k</td><td>2 ACHHMETSHIN 05</td><td>CMD2</td><td>0.60-1.38 e<sup>+</sup> e<sup>-</sup> → ηγ</td><td></td></tr><tr><td>1.61 ±0.20 ±0.11</td><td>23k</td><td>3,4 ACHHMETSHIN 01B</td><td>CMD2</td><td>e<sup>+</sup> e<sup>-</sup> → ηγ</td><td></td></tr><tr><td>1.85 ±0.49</td><td></td><td>5 DOLINSKY</td><td>89</td><td>ND</td><td>e<sup>+</sup> e<sup>-</sup> → ηγ</td></tr></tbody></table>

• • • We do not use the following data for averages, fits, limits, etc.

1.05 ±0.02 6 BENAYOUN 10 RVUE 0.4-1.05 e<sup>+</sup> e<sup>-</sup>

¹From a combined fit of σ(e<sup>+</sup> e<sup>-</sup> → ηγ) with η → 3π<sup>0</sup> and η → π<sup>+</sup> π<sup>-</sup> π<sup>0</sup>, and fixing B(η → 3π<sup>0</sup>) / B(η → π<sup>+</sup> π<sup>-</sup> π<sup>0</sup>) = 1.44 ± 0.04. Recalculated by us from the cross section at the peak. Supersedes ACHASOV 00D and ACHASOV 06A.

²From the η → 2γ decay and using B(η → γγ) = 39.43 ± 0.26%.

³From the η → 3π<sup>0</sup> decay and using B(η → 3π<sup>0</sup>) = (32.24 ± 0.29) × 10<sup>-2</sup>.

⁴The combined fit from 600 to 1380 MeV taking into account ρ(770), ω(782), φ(1020), and ρ(1450) (mass and width fixed at 1450 MeV and 310 MeV respectively).

⁵Recalculated by us from the cross section in the peak.

⁶A simultaneous fit of e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup> π<sup>-</sup>, π<sup>+</sup> π<sup>-</sup> π<sup>0</sup>, π<sup>0</sup> γ, ηγ data.

$$\Gamma(e^{+}e^{-})/\Gamma_{\text{total}} \times \Gamma(\pi^{0}\gamma)/\Gamma_{\text{total}} \quad \Gamma_{12}/\Gamma \times \Gamma_{8}/\Gamma$$

VALUE (units 10<sup>-8</sup>) EVTS DOCUMENT ID TECN COMMENT

2.2 ±0.4 OUR FIT Error includes scale factor of 1.7.

2.21 ±0.34 OUR AVERAGE Error includes scale factor of 1.6. See the ideogram below.

1.98 ±0.22 ±0.10 1 ACHASOV 16A SND 0.60-1.38 e<sup>+</sup> e<sup>-</sup> → π<sup>0</sup>γ

2.90 +0.60 -0.55 ±0.18 18k AKHMETSHIN 05 CMD2 0.60-1.38 e<sup>+</sup> e<sup>-</sup> → π<sup>0</sup>γ

3.61 ±0.74 ±0.49 10k 2 DOLINSKY 89 ND e<sup>+</sup> e<sup>-</sup> → π<sup>0</sup>γ

• • • We do not use the following data for averages, fits, limits, etc.

1.875 ±0.026 3 BENAYOUN 10 RVUE 0.4-1.05 e<sup>+</sup> e<sup>-</sup> → π<sup>0</sup>γ

2.37 ±0.53 ±0.33 36k 4 ACHASOV 03 SND 0.60-0.97 e<sup>+</sup> e<sup>-</sup> → π<sup>0</sup>γ

WEIGHTED AVERAGE
2.21±0.34 (Error scaled by 1.6)

<figure><img src="image_439.png" /></figure>

Values above of weighted average, error, and scale factor are based upon the data in this ideogram only. They are not necessarily the same as our 'best' values, obtained from a least-squares constrained fit utilizing measurements of other (related) quantities as additional information.

²Recalculated by us from the cross section in the peak.

³A simultaneous fit of e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup> π<sup>-</sup>, π<sup>+</sup> π<sup>-</sup> π<sup>0</sup>, π<sup>0</sup> γ, ηγ data.

⁴Using σ<sub>φ</sub> → π<sup>0</sup>γ from ACHASOV 00 and m<sub>ρ</sub> = 775.97 MeV in the model with the energy-independent phase of ρ-ω interference equal to (−10.2 ± 7.0)°.

<table><thead><tr><th>Γ(e<sup>+</sup>e<sup>-</sup>)/Γ<sub>total</sub> × Γ(π<sup>+</sup>π<sup>-</sup>π<sup>0</sup>)/Γ<sub>total</sub></th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th><th>Γ<sub>12</sub>/Γ × Γ<sub>13</sub>/Γ</th></tr></thead><tbody><tr><td>• • • We do not use the following data for averages, fits, limits, etc.</td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>0.903 ±0.076</td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>4.58 +2.46 -1.64 ±1.56</td><td>1.2M</td><td>2 ACHASOV</td><td>03D</td><td>RVUE</td><td>0.4-1.05 e<sup>+</sup> e<sup>-</sup></td></tr></tbody></table>

¹A simultaneous fit of e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup> π<sup>-</sup>, π<sup>+</sup> π<sup>-</sup> π<sup>0</sup>, π<sup>0</sup> γ, ηγ data.

²Statistical significance is less than 3 σ.

## ρ(770) BRANCHING RATIOS

<table><thead><tr><th>Γ(π<sup>±</sup>η)/Γ(ππ)</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>CHG</th><th>COMMENT</th></tr></thead><tbody><tr><td><60</td><td>84</td><td>FERBEL</td><td>66</td><td>HBC</td><td>± π<sup>±</sup>ρ above 2.5</td></tr></tbody></table>

<table><thead><tr><th>Γ(π<sup>±</sup>π<sup>+</sup>π<sup>-</sup>π<sup>0</sup>)/Γ(ππ)</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>CHG</th><th>COMMENT</th></tr></thead><tbody><tr><td><20</td><td>84</td><td>FERBEL</td><td>66</td><td>HBC</td><td>± π<sup>±</sup>ρ above 2.5</td></tr></tbody></table>

• • • We do not use the following data for averages, fits, limits, etc.

35 ±40 JAMES 66 HBC + 2.1 π<sup>+</sup>ρ

<table><thead><tr><th>Γ(π<sup>+</sup>π<sup>-</sup>γ)/Γ<sub>total</sub></th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th><th>Γ<sub>7</sub>/Γ</th></tr></thead><tbody><tr><td>0.0099 ±0.0016 OUR FIT</td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>0.0099 ±0.0016</td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>• • • We do not use the following data for averages, fits, limits, etc.</td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>0.0111 ±0.0014</td><td></td><td>2 VASSERMAN 88</td><td>ND</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup> π<sup>-</sup>γ</td><td></td></tr><tr><td>&lt;0.005</td><td>90</td><td>3 VASSERMAN 88</td><td>ND</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup> π<sup>-</sup>γ</td><td></td></tr></tbody></table>

¹Bremsstrahlung from a decay pion and for photon energy above 50 MeV.

²Superseded by DOLINSKY 91.

³Structure radiation due to quark rearrangement in the decay.

<table><thead><tr><th>Γ(π<sup>0</sup>γ)/Γ<sub>total</sub></th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th><th>Γ<sub>8</sub>/Γ</th></tr></thead><tbody><tr><td>4.20 ±0.52</td><td></td><td>1 ACHASOV</td><td>16A</td><td>SND</td><td>0.60-1.38 e<sup>+</sup> e<sup>-</sup> → π<sup>0</sup>γ</td></tr><tr><td>6.21 +1.28 -1.18 ±0.39</td><td>18k</td><td>2,3 AKHMETSHIN 05</td><td>CMD2</td><td>0.60-1.38 e<sup>+</sup> e<sup>-</sup> → π<sup>0</sup>γ</td><td></td></tr><tr><td>5.22 ±1.17 ±0.75</td><td>36k</td><td>3,4 ACHASOV</td><td>03</td><td>SND</td><td>0.60-0.97 e<sup>+</sup> e<sup>-</sup> → π<sup>0</sup>γ</td></tr><tr><td>6.8 ±1.7</td><td></td><td>5 BENAYOUN</td><td>96</td><td>RVUE</td><td>0.54-1.04 e<sup>+</sup> e<sup>-</sup> → π<sup>0</sup>γ</td></tr><tr><td>7.9 ±2.0</td><td></td><td>3 DOLINSKY</td><td>89</td><td>ND</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>0</sup>γ</td></tr></tbody></table>

¹Using B(ρ → e<sup>+</sup> e<sup>-</sup>) from PDG 15. Supersedes ACHASOV 03.

²Using B(ρ → e<sup>+</sup> e<sup>-</sup>) = (4.67 ± 0.09) × 10<sup>-5</sup>.

³Not independent of the corresponding Γ(e<sup>+</sup> e<sup>-</sup>) × Γ(π<sup>0</sup>γ)/Γ<sup>2</sup>total.

⁴Using B(ρ → e<sup>+</sup> e<sup>-</sup>) = (4.54 ± 0.10) × 10<sup>-5</sup>.

⁵Reanalysis of DRUZHININ 84, DOLINSKY 89, and DOLINSKY 91 taking into account a triangle anomaly contribution.

<table><thead><tr><th>Γ(ηγ)/Γ<sub>total</sub></th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>CHG COMMENT</th></tr></thead><tbody><tr><td>3.00 ±0.21 OUR FIT</td><td></td><td></td><td></td><td></td></tr><tr><td>2.90 ±0.32 OUR AVERAGE</td><td></td><td></td><td></td><td></td></tr><tr><td>2.79 ±0.34 ±0.03</td><td>33k</td><td>1 ACHASOV</td><td>07B</td><td>SND</td><td>0.6-1.38 e<sup>+</sup> e<sup>-</sup> → ηγ</td></tr><tr><td>3.6 ±0.9</td><td></td><td>2 ANDREWS</td><td>77</td><td>CNTR 0</td><td>6.7-10 γCu</td></tr></tbody></table>

¹A CHASOV 07B reports [Γ(ρ(770) → ηγ)/Γ<sub>total</sub>] × [B(ρ(770) → e<sup>+</sup> e<sup>-</sup>)] = (1.32 ± 0.14 ± 0.08) × 10<sup>-8</sup> which we divide by our best value B(ρ(770) → e<sup>+</sup> e<sup>-</sup>) = (4.72 ± 0.05) × 10<sup>-5</sup>. Our first error is their experiment's error and our second error is the systematic error from using our best value. Supersedes ACHASOV 00D and ACHASOV 06A.

²Solution corresponding to constructive ω-ρ interference.

³Using B(ρ → e<sup>+</sup> e<sup>-</sup>) = (4.67 ± 0.09) × 10<sup>-5</sup> and B(η → γγ) = 39.43 ± 0.26%.

⁴Not independent of the corresponding Γ(e<sup>+</sup> e<sup>-</sup>) × Γ(ηγ)/Γ<sup>2</sup>total.

⁵The combined fit from 600 to 1380 MeV taking into account ρ(770), ω(782), φ(1020), and ρ(1450) (mass and width fixed at 1450 MeV and 310 MeV respectively).

⁶Using B(ρ → e<sup>+</sup> e<sup>-</sup>) = (4.75 ± 0.10) × 10<sup>-5</sup> from AKHMETSHIN 02 and B(η → 3π<sup>0</sup>) = (32.24 ± 0.29) × 10<sup>-2</sup>.

⁷Reanalysis of DRUZHININ 84, DOLINSKY 89, and DOLINSKY 91 taking into account a triangle anomaly contribution. Constructive ρ-ω interference solution.

<footnote n="1">¹From the VMD model with the phr0(770), ω(782), φ(1020) resonances, and an additional resonance describing the total contribution of the ρ(1450) and ω(1420) states. Supersedes ACHASOV 03.</footnote>
$$ \Gamma(\pi^0 \pi^0 \gamma) / \Gamma_{\text{total}} \qquad \Gamma_{10/\Gamma} $$

$$ \frac{\text{VALUE (units } 10^{-5})}{\text{EVTS}} $$

DOCUMENT ID

TECN

COMMENT

### 4.5 $\pm 0.8$ OUR FIT

### 4.5 $\pm 0.9$ OUR AVERAGE

<table><tr><td>5.2 $\pm 1.3$</td><td>1.5 ± 0.6</td><td>190</td><td>1 AKHMETSHIN 04B</td><td>CMD2</td><td>0.6-0.97 e<sup>+</sup> e<sup>-</sup> → π<sup>0</sup>π<sup>0</sup>γ</td></tr><tr><td>4.1 $\pm 0.9$</td><td>1.0 ± 0.3</td><td>295</td><td>2 ACHASOV</td><td>02F</td><td>SND</td><td>0.36-0.97 e<sup>+</sup> e<sup>-</sup> → π<sup>0</sup>π<sup>0</sup>γ</td></tr></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>4.8 $\pm 3.4$</td><td>1.8 ± 0.5</td><td>63</td><td>3 ACHASOV</td><td>00G</td><td>SND</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>0</sup>π<sup>0</sup>γ</td></tr></table>

1 This branching ratio includes the conventional VMD mechanism $\rho \to \omega\pi^0$, $\omega \to \pi^0\gamma$, and the new decay mode $\rho \to f_0(500)\gamma$, $f_0(500) \to \pi^0\pi^0$ with a branching ratio ($2.0^{+1.1}_{-0.9} \pm 0.3$) $\times 10^{-5}$ differing from zero by 2.0 standard deviations.

2 This branching ratio includes the conventional VMD mechanism $\rho \to \omega\pi^0$, $\omega \to \pi^0\gamma$ and the new decay mode $\rho \to f_0(500)\gamma$, $f_0(500) \to \pi^0\pi^0$ with a branching ratio ($1.9^{+0.9}_{-0.8} \pm 0.4$) $\times 10^{-5}$ differing from zero by 2.4 standard deviations. Supersedes ACHASOV 00G.

3 Superseded by ACHASOV 02F.

$$ \Gamma(\mu^+ \mu^-) / \Gamma(\pi^+ \pi^-) \qquad \Gamma_{11/\Gamma} $$

$$ \frac{\text{VALUE (units } 10^{-5})}{\text{EVTS}} $$

DOCUMENT ID

TECN

COMMENT

### 4.6 $\pm 0.28$ OUR FIT

### 4.6 $\pm 0.2$ OUR

ANTIPOV

89

SIGM

π$^-$ Cu → $\mu^+ \mu^- \pi^-$ Cu

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>8.2 $\pm 3.6$</td><td>1.6 ± 1.3</td><td>1 ROTHWELL</td><td>69</td><td>CNTR</td><td>Photoproduction</td></tr><tr><td>5.6 ± 1.5</td><td>2.5 ± 1.3</td><td>2 WEHMANN</td><td>69</td><td>OSPK</td><td>12 π$^-$ C, Fe</td></tr><tr><td>9.7 $\pm 3.3$</td><td>3.3 ± 1.1</td><td>3,4 HYAMS</td><td>67</td><td>OSPK</td><td>11 π$^-$ Li, H</td></tr></table>

1 Possibly large $\rho-\omega$ interference leads us to increase the minus error.

2 Result contains 11 ± 11% correction using SU(3) for central value. The error on the correction takes account of possible $\rho-\omega$ interference and the upper limit agrees with the upper limit of $\omega \to \mu^+ \mu^-$ from this experiment.

3 But he even enlarges his error to take residual $\omega$ contamination into account. Since his value is high, seems the other experiments also can't have too many $\omega$'s. But maybe Hyams has additional $\mu$'s from $\rho \to \pi\pi$, decaying $\pi$'s.

4 HYAMS 67's mass resolution is 20 MeV. The $\omega$ region was excluded.

$$ \Gamma(e^+ e^-) / \Gamma(\pi\pi) \qquad \Gamma_{12/\Gamma} $$

$$ \frac{\text{VALUE (units } 10^{-4})}{\text{EVTS}} $$

DOCUMENT ID

TECN

COMMENT

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>0.40 ± 0.05</td><td>1,2 BENAKSAS</td><td>72</td><td>OSPK</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup> π<sup>-</sup></td></tr></table>

1 The $\rho'$ contribution is not taken into account.

2 Barkov excludes Auslender and Benaksas for large statistical and systematic errors.

$$ \Gamma(\pi^+ \pi^- \pi^0) / \Gamma_{\text{total}} \qquad \Gamma_{13/\Gamma} $$

$$ \frac{\text{VALUE (units } 10^{-4})}{\text{EVTS}} \quad \text{CL%} $$

DOCUMENT ID

TECN

COMMENT

0.88 $\pm 0.23$

$0.30$

1 LEES

21B

BABR

10.5 $\pm 0$

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>1.01 $\pm 0.54$</td><td>0.36 ± 0.34</td><td>1.2M</td><td>2 ACHASOV</td><td>03D</td><td>RVUE</td><td>0.44-2.00 e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup> π<sup>-</sup> π<sup>0</sup></td></tr><tr><td>&lt;1.2</td><td>90</td><td>VASSERMAN</td><td>88b</td><td>ND</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup> π<sup>-</sup> π<sup>0</sup></td></tr></table>

1 From the cross section for $e^+ e^- \to \pi^+ \pi^- \pi^0$ with contributions from $\rho(770)$, $\omega(782)$, $\phi(1020)$, $\omega(1420)$, and $\omega(1650)$. Statistical evidence is more than 6 $\sigma$.

2 Statistical significance is less than $3\sigma$.

$$ \Gamma(\pi^+ \pi^- \pi^0) / \Gamma(\pi\pi) \qquad \Gamma_{13/\Gamma} $$

$$ \frac{\text{VALUE (units } 10^{-4})}{\text{EVTS}} \quad \text{CL%} $$

DOCUMENT ID

TECN

CHG

COMMENT

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>~ 0.01</td><td>BRAMON</td><td>86</td><td>RVUE</td><td>0</td><td>J/ψ → ωπ<sup>0</sup></td></tr><tr><td>&lt;0.01</td><td>84</td><td>1 ABRAMS</td><td>71</td><td>HBC</td><td>0</td><td>3.7 π<sup>+</sup> ρ</td></tr></table>

1 Model dependent, assumes $l = 1, 2$, or 3 for the $3\pi$ system.

$$ \Gamma(\pi^+ \pi^- \pi^+ \pi^-) / \Gamma_{\text{total}} \qquad \Gamma_{14/\Gamma} $$

$$ \frac{\text{VALUE (units } 10^{-5})}{\text{EVTS}} \quad \text{CL%} $$

DOCUMENT ID

TECN

COMMENT

### 1.8 $\pm 0.9$ OUR FIT

### 1.8 $\pm 0.9$ OUR

AKHMETSHIN 00

CMD2

0.6-0.97 e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup> π<sup>-</sup> π<sup>+</sup> π<sup>-</sup>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>&lt;20</td><td>90</td><td>KURDADZE</td><td>88</td><td>OLYA</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup> π<sup>-</sup> π<sup>+</sup> π<sup>-</sup></td></tr></table>

$$ \Gamma(\pi^+ \pi^- \pi^+ \pi^-) / \Gamma(\pi\pi) \qquad \Gamma_{14/\Gamma} $$

$$ \frac{\text{VALUE (units } 10^{-4})}{\text{EVTS}} \quad \text{CL%} $$

DOCUMENT ID

TECN

CHG

COMMENT

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>&lt;15</td><td>90</td><td>ERBE</td><td>69</td><td>HBC</td><td>0</td><td>2.5-5.8 γρ</td></tr><tr><td>&lt;20</td><td>90</td><td>CHUNG</td><td>68</td><td>HBC</td><td>0</td><td>3.2-4.2 π<sup>-</sup> ρ</td></tr><tr><td>&lt;20</td><td>90</td><td>HUSON</td><td>68</td><td>HLBC</td><td>0</td><td>16.0 π<sup>-</sup> ρ</td></tr><tr><td>&lt;80</td><td>90</td><td>JAMES</td><td>66</td><td>HBC</td><td>0</td><td>2.1 π<sup>+</sup> ρ</td></tr></table>

$$ \Gamma(\pi^+ \pi^- \pi^0 \pi^0) / \Gamma_{\text{total}} \qquad \Gamma_{15/\Gamma} $$

$$ \frac{\text{VALUE (units } 10^{-5})}{\text{EVTS}} \quad \text{CL%} \quad 1.60 \pm 0.74 \quad 0.18 $$

$$ \frac{\text{DOCUMENT ID}}{\text{TECN}} \quad \text{09A} \quad \text{SND} \quad e^+ e^- \to \pi^+ \pi^- \pi^0 \pi^0 $$

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>&lt;4</td><td>90</td><td>AULCHENKO</td><td>87c</td><td>ND</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup> π<sup>-</sup> π<sup>0</sup> π<sup>0</sup></td></tr><tr><td>&lt;20</td><td>90</td><td>KURDADZE</td><td>86</td><td>OLYA</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup> π<sup>-</sup> π<sup>0</sup> π<sup>0</sup></td></tr></table>

1 Assuming no interference between the $\rho$ and $\omega$ contributions.

$$ \Gamma(\pi^0 e^+ e^-) / \Gamma_{\text{total}} \qquad \Gamma_{16/\Gamma} $$

$$ \frac{\text{VALUE (units } 10^{-5})}{\text{EVTS}} \quad \text{CL%} \quad 1.2 $$

$$ \frac{\text{DOCUMENT ID}}{\text{TECN}} \quad \text{08} \quad \text{SND} \quad 0.36-0.97 e^+ e^- \to \pi^0 e^+ e^- $$

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>&lt;1.6</td><td>90</td><td>AKHMETSHIN 05A</td><td>CMD2</td><td>0.72-0.84 e<sup>+</sup> e<sup>-</sup></td></tr></table>

$$ \Gamma(\eta e^+ e^-) / \Gamma_{\text{total}} \qquad \Gamma_{17/\Gamma} $$

$$ \frac{\text{VALUE (units } 10^{-5})}{\text{EVTS}} \quad \text{CL%} \quad 0.7 < 0.7 $$

$$ \frac{\text{DOCUMENT ID}}{\text{TECN}} \quad \text{05A} \quad \text{SND} \quad 0.72-0.84 e^+ e^- $$

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>&lt;0.7</td><td>90</td><td>AKHMETSHIN 05A</td><td>CMD2</td><td>0.72-0.84 e<sup>+</sup> e<sup>-</sup></td></tr></table>

## ρ(770) REFERENCES

<table><tr><td>ACHASOV</td><td>21</td><td>JHEP 2101 113</td><td>M.N. Achasov et al.</td><td>(SND Collab.)</td></tr><tr><td>LEES</td><td>21B</td><td>PR D104 112003</td><td>J.P. Lees et al.</td><td>(BABAR Collab.)</td></tr><tr><td>ANDREEV</td><td>20</td><td>PR C80 1189</td><td>V. Andreev et al.</td><td>(HJ Collab.)</td></tr><tr><td>ABLIKIM</td><td>18C</td><td>PR 120 242003</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>17</td><td>PR 118 012001</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>BARTOS</td><td>17</td><td>PR D96 113004</td><td>E. Bartos et al.</td><td>(BESIII Collab.)</td></tr><tr><td>BARTOS</td><td>17A</td><td>JMP A32 1750154</td><td>E. Bartos et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>16C</td><td>PL B753 629</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ACHASOV</td><td>16A</td><td>PR D93 092001</td><td>M.N. Achasov et al.</td><td>(PDG Collab.)</td></tr><tr><td>PDG</td><td>15</td><td>RPP 2015 at pdg.lbl.gov</td><td></td><td>(PDG Collab.)</td></tr><tr><td>ABRAMOWICZ</td><td>12</td><td>EPJ C72 1869</td><td>H. Abramowicz et al.</td><td>(ZEUS Collab.)</td></tr><tr><td>LEES</td><td>12G</td><td>PR D66 032013</td><td>J.P. Lees et al.</td><td>(BABAR Collab.)</td></tr><tr><td>ABROSIMNO</td><td>11A</td><td>PR B700 102</td><td>F. Ambrosino et al.</td><td>(KLOE Collab.)</td></tr><tr><td>GARCIA-MAR...</td><td>11</td><td>PR D74 072001</td><td>R. Garcia-Martin et al.</td><td>(MADR, CRAC Collab.)</td></tr><tr><td>BATLEY</td><td>10C</td><td>EPJ C70 635</td><td>J.R. Batley et al.</td><td>(CERN NA48/2 Collab.)</td></tr><tr><td>BENAYOUN</td><td>10</td><td>EPJ C65 211</td><td>M. Benayoun et al.</td><td></td></tr><tr><td>DUBINCKA</td><td>10</td><td>APS 60 1</td><td>S. Dubinicka, A.Z. Dubnickova et al.</td><td></td></tr><tr><td>ACHASOV</td><td>09A</td><td>JETP 109 379</td><td>M.N. Achasov et al.</td><td>(SND Collab.)</td></tr><tr><td>AUBERT</td><td>09AS</td><td>PR 103 231801</td><td>B. Aubert et al.</td><td>(BABAR Collab.)</td></tr><tr><td>ACHASOV</td><td>08</td><td>JETP 107 61</td><td>M.N. Achasov et al.</td><td>(SND Collab.)</td></tr><tr><td>FUJIKAWA</td><td>08</td><td>PR D78 072006</td><td>M. Fujikawa et al.</td><td>(BELLE Collab.)</td></tr><tr><td>ABASOV</td><td>07B</td><td>PR D76 077101</td><td>M.N. Achasov et al.</td><td>(SND Collab.)</td></tr><tr><td>AKHMETSHIN</td><td>07</td><td>PL B648 28</td><td>R.R. Akhmetshin et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>ACHASOV</td><td>06</td><td>PL JETP 103 380</td><td>M.N. Achasov et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>ACHASOV</td><td>06A</td><td>PR D74 014016</td><td>M.N. Achasov et al.</td><td>(SND Collab.)</td></tr><tr><td>AULCHENKO</td><td>06</td><td>JETP 84 413</td><td>V.M. Aulchenko et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>ACHASOV</td><td>05A</td><td>JETP 101 1053</td><td>M.N. Achasov et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>AKHMETSHIN</td><td>05</td><td>PL B605 26</td><td>R.R. Akhmetshin et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>AKHMETSHIN</td><td>05A</td><td>PL B613 29</td><td>R.R. Akhmetshin et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>ALOISIO</td><td>05</td><td>PL B606 12</td><td>A. Aloisio et al.</td><td>(KLOE Collab.)</td></tr><tr><td>AULCHENKO</td><td>05</td><td>JETP 82 743</td><td>V.M. Aulchenko et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>SCHAEL</td><td>05C</td><td>PRPL 421 191</td><td>S. Schael et al.</td><td>(ALEPH Collab.)</td></tr><tr><td>AKHMETSHIN</td><td>04</td><td>PL B587 285</td><td>R.R. Akhmetshin et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>AKHMETSHIN</td><td>04B</td><td>PL B580 119</td><td>R.R. Akhmetshin et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>PELAZ</td><td>04A</td><td>PL M419 2879</td><td>J.R. Pelaz</td><td>(MADU Collab.)</td></tr><tr><td>ACHASOV</td><td>05</td><td>PL D959 171</td><td>M.N. Achasov et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>ACHASOV</td><td>03D</td><td>PR D68 052006</td><td>A. Aloisio et al.</td><td>(KLOE Collab.)</td></tr><tr><td>ALOISIO</td><td>03</td><td>PL B561 55</td><td>A. Aloisio et al.</td><td>(KLOE Collab.)</td></tr><tr><td>SANZ-CILLERO</td><td>03</td><td>EPJ C27 587</td><td>J.J. Sanz-Cillero, A. Pich</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>ACHASOV</td><td>02</td><td>PL D65 032002</td><td>M.N. Achasov et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>ACHASOV</td><td>02</td><td>PL D67 201</td><td>M.N. Achasov et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>AKHMETSHIN</td><td>02</td><td>PL B527 161</td><td>R.R. Akhmetshin et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>AKHMETSHIN</td><td>01B</td><td>PL B509 217</td><td>R.R. Akhmetshin et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>COLANGELO</td><td>01</td><td>NP B603 125</td><td>G. Colangelo, J. Gasser, H. Leytwyler et al.</td><td></td></tr><tr><td>PICH</td><td>01</td><td>PR D63 093005</td><td>A. Pich, J. Portoles</td><td></td></tr><tr><td>ACHASOV</td><td>00</td><td>EPJ C12 25</td><td>M.N. Achasov et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>ACHASOV</td><td>00D</td><td>JETP 72 282</td><td>M.N. Achasov et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>ACHASOV</td><td>00G</td><td>JETP 71 355</td><td>M.N. Achasov et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>AKHMETSHIN</td><td>00</td><td>PL B475 190</td><td>R.R. Akhmetshin et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>ANDERSON</td><td>00A</td><td>PR D61 112002</td><td>S. Anderson et al.</td><td>(CLEO Collab.)</td></tr><tr><td>ABELE</td><td>99E</td><td>PL B469 270</td><td>A. Abele et al.</td><td>(Crystal Barrel Collab.)</td></tr><tr><td>BENAYOUN</td><td>98</td><td>EPJ C2 269</td><td>M. Benayoun et al.</td><td>(IPNP, NOVO, ADL+)</td></tr><tr><td>BREITWEG</td><td>98B</td><td>EPJ C2 247</td><td>J. Breitweg et al.</td><td>(ZEUS Collab.)</td></tr><tr><td>GARDNER</td><td>98</td><td>PR D57 2716</td><td>S. Gardner, H.B. O'Connell</td><td></td></tr><tr><td>Also</td><td></td><td>PR D62 091993 (errat.)</td><td>S. Gardner, H.B. O'Connell</td><td></td></tr><tr><td>ABELE</td><td>97</td><td>PL B391 191</td><td>A. Abele et al.</td><td>(Crystal Barrel Collab.)</td></tr><tr><td>ADAMS</td><td>97</td><td>ZPHY C74 237</td><td>M.R. Adams et al.</td><td>(E665 Collab.)</td></tr><tr><td>BARATE</td><td>97M</td><td>ZPHY C76 15</td><td>R. Barate et al.</td><td>(ALEPH Collab.)</td></tr><tr><td>BERTIN</td><td>97C</td><td>JETP 8408 476</td><td>A. Bertin et al.</td><td>(OBELIX Collab.)</td></tr><tr><td>BOGOLYUB...</td><td>97</td><td>PAN 60 46</td><td>M.Y. Bogolyubsky et al.</td><td>(MOSU, SERP)</td></tr><tr><td>O'CONNELL</td><td>97</td><td>NP A623 559</td><td>H.B. O'Connell et al.</td><td>(ADLD Collab.)</td></tr><tr><td>BAYAYOUN</td><td>96</td><td>ZPHY C72 221</td><td>M. Benayoun et al.</td><td>(IPNP, NOVO Collab.)</td></tr><tr><td>BERNICHA</td><td>94</td><td>PR D50 4454</td><td>A. Bernicha, G. Lopez Castro, J. Pestiehl et al.</td><td>(LOUV+)</td></tr><tr><td>WEIDENAUER</td><td>93</td><td>ZPHY C59 387</td><td>P. Weidenauer et al.</td><td>(ASTERIX Collab.)</td></tr><tr><td>AGUILAR...</td><td>91</td><td>ZPHY C50 450</td><td>M. Aguilar-Benitez et al.</td><td>(LEBC-EMS Collab.)</td></tr><tr><td>DOLINSKY</td><td>91</td><td>PRPL 202 99</td><td>S.I. Dolinsky et al.</td><td>(NOVO Collab.)</td></tr><tr><td>KUHN</td><td>90</td><td>ZPHY C48 445</td><td>J.H. Kuhn et al.</td><td>(MPIM)</td></tr><tr><td>ANTIPOV</td><td>89</td><td>ZPHY C42 185</td><td>Y.M. Antipov et al.</td><td>(SERP, JINR, BGNA+)</td></tr><tr><td>BISELLO</td><td>89</td><td>PL B220 321</td><td>D. Bisello et al.</td><td>(DM2 Collab.)</td></tr><tr><td>DOLINSKY</td><td>89</td><td>ZPHY C42 511</td><td>S.I. Dolinsky et al.</td><td>(NOVO Collab.)</td></tr><tr><td>DUBINCKA</td><td>89</td><td>JP G15 1349</td><td>S. Dubinicka et al.</td><td>(JINR, SLOV)</td></tr><tr><td>GESHKEN...</td><td>89</td><td>ZPHY C45 351</td><td>B.V. Geshkenbein</td><td>(ITEP Collab.)</td></tr><tr><td>KURDADZE</td><td>88</td><td>JP C47 512</td><td>L.M. Kurdadze et al.</td><td>(NOVO Collab.)</td></tr><tr><td>VASSERMAN</td><td>88</td><td>Transated from ZETF 47 432.</td><td></td><td></td></tr><tr><td>VASSERMAN</td><td>88B</td><td>SJNP 47 1035</td><td>I.B. Vasserman et al.</td><td>(NOVO Collab.)</td></tr><tr><td>VASSERMAN</td><td>88B</td><td>SJNP 48 480</td><td>I.B. Vasserman et al.</td><td>(NOVO Collab.)</td></tr><tr><td>VASSERMAN</td><td>88B</td><td>Transated from YAF 47 1635.</td><td></td><td></td></tr><tr><td>VASSERMAN</td><td>88B</td><td>Transated from YAF 48 753.</td><td></td><td></td></tr></table>
# Meson Particle Listings

$\rho(770), \omega(782)$

<table><tbody><tr><td>AULCHENKO</td><td>87C</td><td>IYF 87-90 Preprint</td><td>V.M. Aukhenko et al.</td><td>(NOVO)</td></tr><tr><td>CAPRARO</td><td>87</td><td>NP B288 659</td><td>L. Capraro et al.</td><td>(CLER, FRAS, MILA+)</td></tr><tr><td>BRAMON</td><td>86</td><td>PL B173 657</td><td>A. Bramon, J. Casulleras</td><td>(BARC)</td></tr><tr><td>HUSTON</td><td>86</td><td>PR D33 3199</td><td>J. Huston et al.</td><td>(ROCH, FNAL, MINN)</td></tr><tr><td>KURDADZE</td><td>86</td><td>JETPL 43 643</td><td>L.M. Kurdadze et al.</td><td>(NOVO)</td></tr><tr><td></td><td></td><td>Translated from ZETFP</td><td>43 497</td><td></td></tr><tr><td>BARKOV</td><td>85</td><td>NP B256 365</td><td>L.M. Barkov et al.</td><td>(NOVO)</td></tr><tr><td>DRUZHININ</td><td>84</td><td>PL 144B 136</td><td>V.P. Druzhinin et al.</td><td>(NOVO)</td></tr><tr><td>CHABAUD</td><td>83</td><td>NP B223 1</td><td>V. Chabaud et al.</td><td>(CERN, CRAC, MPIM)</td></tr><tr><td>JENSEN</td><td>83</td><td>PR D27 26</td><td>T. Jensen et al.</td><td>(ROCH, FNAL, MINN)</td></tr><tr><td>HEYN</td><td>81</td><td>ZPHY C7 169</td><td>M.F. Heyn, C.B. Lang</td><td>(GRAZ)</td></tr><tr><td>BOHACIK</td><td>80</td><td>PR D21 1342</td><td>J. Bohacik, H. Kuhnelt</td><td>(SLOV, WIEN)</td></tr><tr><td>COHEN</td><td>80</td><td>PR D22 2595</td><td>D. Cohen et al.</td><td>(ANL)</td></tr><tr><td>LANG</td><td>79</td><td>PR D19 956</td><td>C.B. Lang, A. Mas-Parareda</td><td>(GRAZ)</td></tr><tr><td>BARTALUCCI</td><td>78</td><td>NC 44A 587</td><td>S. Bartalucci et al.</td><td>(DESY, FRAS)</td></tr><tr><td>WICKLUND</td><td>78</td><td>PR D17 1197</td><td>A.B. Wicklund et al.</td><td>(ANL)</td></tr><tr><td>ANDREWS</td><td>77</td><td>PR 38 198</td><td>D. Andrews et al.</td><td>(ROCH)</td></tr><tr><td>DEUTSCH...</td><td>76</td><td>NP B103 426</td><td>M. Deutschmann et al.</td><td>(AACH3, BERL, BONN+)</td></tr><tr><td>ENGLER</td><td>74</td><td>PR D10 2070</td><td>A. Engler et al.</td><td>(CMU, CASE)</td></tr><tr><td>ESTABROOKS</td><td>74</td><td>NP B79 301</td><td>P.G. Estabrooks, A.D. Martin</td><td>(DURH)</td></tr><tr><td>GRAYER</td><td>74</td><td>NP B75 189</td><td>G. Grayer et al.</td><td>(CERN, MPIM)</td></tr><tr><td>RATCLIFF</td><td>74</td><td>Private Comm.</td><td></td><td></td></tr><tr><td>BYERLY</td><td>73</td><td>PR D7 637</td><td></td><td></td></tr><tr><td>GLADDLING</td><td>73</td><td>PR D8 3721</td><td>W.L. Byerly et al.</td><td>(MICH)</td></tr><tr><td>HYAMS</td><td>73</td><td>NP B64 134</td><td>G.E. Gladding et al.</td><td>(HARV)</td></tr><tr><td>PROTOPOP...</td><td>73</td><td>PR D7 1279</td><td>B.D. Hyams et al.</td><td>(CERN, MPIM)</td></tr><tr><td>BALLAM</td><td>72</td><td>PR D5 545</td><td>S.D. Protopopescu et al.</td><td>(LBL)</td></tr><tr><td>BENAKSAS</td><td>72</td><td>PR D2 289</td><td>J. Ballam et al.</td><td>(SLAC, LBL, TUFTS)</td></tr><tr><td>JACOBS</td><td>72</td><td>PR D6 1291</td><td>D. Benakas et al.</td><td>(ORSAY)</td></tr><tr><td>RATCLIFF</td><td>72</td><td>PL 38B 345</td><td>L.D. Jacobs</td><td>(SACL)</td></tr><tr><td>ABRAMS</td><td>71</td><td>PR D4 653</td><td>B.N. Ratcliff et al.</td><td>(SLAC)</td></tr><tr><td>ALVENSELE...</td><td>70</td><td>PR 24 786</td><td>G.S. Abrams et al.</td><td>(LBL)</td></tr><tr><td>BIGGS</td><td>70</td><td>PR 24 1197</td><td>H. Alvenseleben et al.</td><td>(DESY)</td></tr><tr><td>ERBE</td><td>69</td><td>PR 188 2060</td><td>P.J. Biggs et al.</td><td>(DARE)</td></tr><tr><td>MALAMUD</td><td>69</td><td>Argonne Conf. 93</td><td>R. Erbe et al.</td><td>(German Bubble Chamber Collab.)</td></tr><tr><td>REYNOLDS</td><td>69</td><td>PR 184 1424</td><td>E.I. Malamud, P.E. Schlein</td><td>(UCLA)</td></tr><tr><td>ROTH 23</td><td>69</td><td>PL 152 151</td><td>B.G. Reynolds et al.</td><td>(FSU)</td></tr><tr><td>WEHMANN</td><td>69</td><td>PR 178 2095</td><td>P.L. Rothwell et al.</td><td>(NEAS)</td></tr><tr><td>ANDRSEN</td><td>68</td><td>PR 54 999</td><td>A.A. Wehmann et al.</td><td>(HARV, CASE, SLAC+)</td></tr><tr><td>BATON</td><td>68</td><td>PR 176 1574</td><td>N. Armenise et al.</td><td>(BARI, BGN, FIZR+)</td></tr><tr><td>CHUNG</td><td>68</td><td>PR 165 1491</td><td>J.P. Baton, G. Laurens</td><td>(SACL)</td></tr><tr><td>FOSTER</td><td>68</td><td>NP B6 107</td><td>S.U. Chung et al.</td><td>(LRL)</td></tr><tr><td>GOUNARIS</td><td>68</td><td>PL 21 244</td><td>M. Foster et al.</td><td>(CERN, CDEF)</td></tr><tr><td>HUSON</td><td>68</td><td>PL 28B 208</td><td>G.J. Gounaris, J.J. Sakurai</td><td></td></tr><tr><td>HYAMS</td><td>68</td><td>NP B7 1</td><td>R. Huson et al.</td><td>(ORSAY, MILA, UCLA)</td></tr><tr><td>LANZEROTTI</td><td>68</td><td>PR 166 1365</td><td>B.D. Hyams et al.</td><td>(CERN, MPIM)</td></tr><tr><td>PISUT</td><td>68</td><td>NP B6 325</td><td>L.J. Lanzerotti et al.</td><td>(HARV)</td></tr><tr><td>ASBURY</td><td>67B</td><td>PL 19 865</td><td>J. Pisut, M. Roos</td><td>(CERN)</td></tr><tr><td>BACON</td><td>67</td><td>PL 157 1263</td><td>J.G. Asbury et al.</td><td>(DESY, COLU)</td></tr><tr><td>EISNER</td><td>67</td><td>PR 164 1699</td><td>T.C. Bacon et al.</td><td>(BNL)</td></tr><tr><td>HUWE</td><td>67</td><td>PL 24B 252</td><td>R.L. Eisner et al.</td><td>(PURD)</td></tr><tr><td>HYAMS</td><td>67</td><td>PL 24B 634</td><td>D.O. Huwe et al.</td><td>(COLU)</td></tr><tr><td>MILLER</td><td>67B</td><td>PR 153 1423</td><td>B.D. Hyams et al.</td><td>(CERN, MPIM)</td></tr><tr><td>ALFF...</td><td>66</td><td>PR 145 1072</td><td>D.H. Miller et al.</td><td>(PURD)</td></tr><tr><td>FERBEL</td><td>66</td><td>PL 21 111</td><td>C. Alff-Steinberger et al.</td><td>(COLU, RUTG)</td></tr><tr><td>HAGOPIAN</td><td>66</td><td>PR 145 1128</td><td>T. Ferbel</td><td>(ROCH)</td></tr><tr><td>HAGOPIAN</td><td>66</td><td>PR 152 1183</td><td>V. Hagopian et al.</td><td>(PENN, SACL)</td></tr><tr><td>JACOBS</td><td>66B</td><td>UCRL 16877</td><td>V. Hagopian, Y.L. Pan</td><td>(PENN, LRL)</td></tr><tr><td>JAMES</td><td>66</td><td>PR 142 896</td><td>L.D. Jacobs</td><td>(LRL)</td></tr><tr><td>ROSS</td><td>66</td><td>PR 149 1172</td><td>F.E. James, H.L. Kraybill</td><td>(YALE, BNL)</td></tr><tr><td>SOEDING</td><td>66</td><td>PL B19 702</td><td>P. Soeding</td><td></td></tr><tr><td>WEST</td><td>66</td><td>PR 149 1089</td><td>E. West et al.</td><td>(WISC)</td></tr><tr><td>BLIEDEN</td><td>65</td><td>PL 19 444</td><td>H.R. Blieden et al.</td><td>(CERN MMS Collab.)</td></tr><tr><td>CARMONY</td><td>64</td><td>PL 12 254</td><td>D.D. Carmony et al.</td><td>(UCB)</td></tr><tr><td>GOLDHABER</td><td>64</td><td>PL 12 336</td><td>G. Goldhaber et al.</td><td>(LRL, UCB)</td></tr><tr><td>ABOLINS</td><td>63</td><td>PL 11 381</td><td>M.A. Abolins et al.</td><td>(UCSD)</td></tr></tbody></table>

<table><tbody><tr><td>781.0 ±0.6</td><td>510</td><td>BIZZARRI</td><td>71 HBC</td><td>0.0 p p&#773; → K<sub>1</sub> K<sub>1</sub> ω</td></tr><tr><td>783.7 ±1.0</td><td>3583</td><td>12 COYNE</td><td>71 HBC</td><td>3.7 π<sup>+</sup> p → pπ<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr><tr><td>784.1 ±1.2</td><td>750</td><td>ABRAMOVI...</td><td>70 HBC</td><td>3.9 π<sup>-</sup> p</td></tr><tr><td>783.2 ±1.6</td><td>13 BIGGS</td><td></td><td>70B CNTR</td><td>&lt;4.1 γC → π<sup>+</sup>π<sup>-</sup>C</td></tr><tr><td>782.4 ±0.5</td><td>2400</td><td>BIZZARRI</td><td>69 HBC</td><td>0.0 p p&#773;</td></tr></tbody></table>

¹Update of AKHMETSHIN 00C.

²From the combined fit of ANTONELLI 92, ACHASOV 01E, ACHASOV 02E, and ACHASOV 03D data on the $π^+π^-π^0$ and ANTONELLI 92 on the $ωπ^+π^-$ final states. Supersedes ACHASOV 99E and ACHASOV 02E.

³From the $η → γγ$ decay.

⁴From the $η → 3π^0$ decay.

⁵Observed by threshold-crossing technique. Mass resolution = 4.8 MeV FWHM.

⁶The values were extracted from a dispersively improved Breit-Wigner parameterization and do not include vacuum polarization. Inclusion of vacuum polarization gives 782.736 ± 0.024 MeV.

⁷The $ω$ mass was extracted from a dispersively improved Breit-Wigner parameterization, the $ω$ width fixed at 8.49 ± 0.08 MeV. The value does not include vacuum polarization which would shift the mass to 781.81 ± 0.09 ± 0.03 MeV. The mixing parameter is assumed real valued.

⁸The values were extracted from a dispersively improved Breit-Wigner parameterization and do not include vacuum polarization.

⁹From the $p-ω$ interference in the $π^+π^-$ mass spectrum using the Breit-Wigner for the $ω$ and leaving its mass and width as free parameters of the fit.

¹⁰Systematic uncertainties underestimated.

¹¹Systematic uncertainties not estimated.

¹²From best-resolution sample of COYNE 71.

¹³From $ω-p$ interference in the $π^+π^-$ mass spectrum assuming $ω$ width 12.6 MeV.

<figure><img src="image_440.png" /><figcaption>$\omega(782)$ mass (MeV)</figcaption></figure>

$\omega(782)$

$\omega(782) \text{ MASS}$

<table><thead><tr><th>VALUE (MeV)</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td><strong>782.66±0.13 OUR AVERAGE</strong></td><td></td><td>Error Includes scale factor</td><td>of 2.0.</td><td>See the ideogram below.</td></tr><tr><td>777.9 ±2.2 <sup>+4.3</sup><sub>-2.2</sub></td><td>900k</td><td>ANDREEV</td><td>20 H1</td><td>e<sup>+</sup> → eπ<sup>+</sup>π<sup>-</sup> p</td></tr><tr><td>783.20 ±0.13±0.16</td><td>18680</td><td>AKHMETSHIN 05</td><td>CMD2</td><td>0.60<sup>+1.38</sup><sub>-0.7</sub> e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>γ</td></tr><tr><td>782.68 ±0.09±0.04</td><td>11200</td><td>1 AKHMETSHIN 04</td><td>CMD2</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr><tr><td>782.79 ±0.08±0.09</td><td>1.2M</td><td>2 ACHASOV</td><td>03D RVUE</td><td>0.44-2.00 e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr><tr><td>781.96 ±0.17±0.80</td><td>11k</td><td>3 AMSLER</td><td>94C CBAR</td><td>0.0 p p&#773; → ωηπ<sup>0</sup></td></tr><tr><td>782.08 ±0.36±0.82</td><td>3463</td><td>4 AMSLER</td><td>94C CBAR</td><td>0.0 p p&#773; → ωηπ<sup>0</sup></td></tr><tr><td>781.96 ±0.13±0.17</td><td>15k</td><td>AMSLER</td><td>93B CBAR</td><td>0.0 p p&#773; → ωπ<sup>0</sup>π<sup>0</sup></td></tr><tr><td>782.4 ±0.2</td><td>270k</td><td>WEIDENAUER 93</td><td>ASTE</td><td>p p&#773; → 2π<sup>+</sup>2π<sup>-</sup>π<sup>0</sup></td></tr><tr><td>782.4 ±0.5</td><td>7000</td><td>5 KEYNE</td><td>76 CNTR</td><td>π<sup>-</sup> p → ωn</td></tr><tr><td colspan="5"><strong>• • • We do not use the following data for averages, fits, limits, etc. • • •</strong></td></tr><tr><td>782.58 ±0.03±0.01</td><td>6 HOID</td><td>20 RVUE</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>0</sup>γ</td><td></td></tr><tr><td>781.68 ±0.09±0.03</td><td>7 COLANGELO</td><td>19 RVUE</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup></td><td></td></tr><tr><td>782.63 ±0.03±0.01</td><td>8 HOFERICHT...</td><td>19 RVUE</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td><td></td></tr><tr><td>781.91 ±0.24</td><td>9 LEES</td><td>12G BABR</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>γ</td><td></td></tr><tr><td>782.7 ±0.1 ±1.5</td><td>10 WURZINGER</td><td>95 SPEC</td><td>1.33 p d → <sup>3</sup>Heω</td><td></td></tr><tr><td>781.78 ±0.10</td><td>10 BARKOV</td><td>87 CMD</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td><td></td></tr><tr><td>782.2 ±0.4</td><td>11 KURDADZE</td><td>83B OLYA</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td><td></td></tr><tr><td>783.3 ±0.4</td><td>1488</td><td>CORDIER</td><td>80 DM1</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr><tr><td>782.5 ±0.8</td><td>433</td><td>ROOS</td><td>80 RVUE</td><td>0.0-3.6 p p&#773;</td></tr><tr><td>782.6 ±0.8</td><td>33260</td><td>BENKHEIRI</td><td>79 OMEG</td><td>9-12 π<sup>±</sup> p</td></tr><tr><td>781.8 ±0.6</td><td>1430</td><td>COOPER</td><td>78B HBC</td><td>0.7-0.8 p p&#773; → 5π</td></tr><tr><td>782.7 ±0.9</td><td>535</td><td>VANAPEL...</td><td>78 HBC</td><td>7.2 p p&#773; → p pω</td></tr><tr><td>783.5 ±0.8</td><td>2100</td><td>NESSEROLI</td><td>77 HBC</td><td>11 π<sup>-</sup> p → ωn</td></tr><tr><td>782.5 ±0.8</td><td>418</td><td>AGUILAR...</td><td>72B HBC</td><td>3.9,4.6 K<sup>-</sup> p</td></tr><tr><td>783.4 ±1.0</td><td>248</td><td>BIZZARRI</td><td>71 HBC</td><td>0.0 p p&#773; → K<sup>+</sup> K<sup>-</sup>ω</td></tr></tbody></table>

$\omega(782) \text{ WIDTH}$

<table><thead><tr><th>VALUE (MeV)</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td><strong>8.68±0.13 OUR AVERAGE</strong></td><td></td><td></td><td></td><td></td></tr><tr><td>8.68±0.23±0.10</td><td>11200</td><td>1 AKHMETSHIN 04</td><td>CMD2</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr><tr><td>8.68±0.04±0.15</td><td>1.2M</td><td>2 ACHASOV</td><td>03D RVUE</td><td>0.44-2.00 e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr><tr><td colspan="5"><strong>• • • We do not use the following data for averages, fits, limits, etc. • • •</strong></td></tr><tr><td>8.65±0.06±0.01</td><td>3 HOID</td><td>20 RVUE</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>0</sup>γ</td><td></td></tr><tr><td>8.71±0.04±0.04</td><td>12G</td><td>4 HOFERICHT...</td><td>19 RVUE</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr><tr><td>8.13±0.45</td><td>19500</td><td>5 LEES</td><td>12G BABR</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>γ</td></tr><tr><td>8.2 ±0.3</td><td>19500</td><td>6 WURZINGER</td><td>95 SPEC</td><td>1.33 p d → <sup>3</sup>Heω</td></tr><tr><td>8.4 ±0.1</td><td>87 ND</td><td>7 AULCHENKO</td><td>87 ND</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr><tr><td>8.30±0.40</td><td>87 CMD</td><td>6 BARKOV</td><td>87 CMD</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr><tr><td>9.8 ±0.9</td><td>83B OLYA</td><td>8 KURDADZE</td><td>83B OLYA</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr><tr><td>9.0 ±0.8</td><td>1488</td><td>6 CORDIER</td><td>80 DM1</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr><tr><td>12 ±2</td><td>1430</td><td>COOPER</td><td>78B HBC</td><td>0.7-0.8 p p&#773; → 5π</td></tr><tr><td>9.4 ±2.5</td><td>2100</td><td>GESSAROLI</td><td>77 HBC</td><td>11 π<sup>-</sup> p → ωn</td></tr><tr><td>10.22±0.43</td><td>20000</td><td>9 KEYNE</td><td>76 CNTR</td><td>π<sup>-</sup> p → ωn</td></tr><tr><td>13.3 ±2</td><td>418</td><td>AGUILAR...</td><td>72B HBC</td><td>3.9,4.6 K<sup>-</sup> p</td></tr><tr><td>9.1 ±0.8</td><td>451</td><td>6 BENAKSAS</td><td>72B OSPK</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr><tr><td>10.5 ±1.5</td><td>940</td><td>BORENSTEIN</td><td>72 HBC</td><td>2.18 K<sup>-</sup> p</td></tr><tr><td>7.70±0.9 ±1.15</td><td>940</td><td>BROWN</td><td>72 MMS</td><td>2.5 π<sup>-</sup> p → nMM</td></tr><tr><td>10.3 ±1.4</td><td>510</td><td>BIZZARRI</td><td>71 HBC</td><td>0.0 p p&#773; → K<sub>1</sub> K<sub>1</sub>ω</td></tr><tr><td>12.8 ±3.0</td><td>248</td><td>BIZZARRI</td><td>71 HBC</td><td>0.0 p p&#773; → K<sup>+</sup> K<sup>-</sup>ω</td></tr><tr><td>9.5 ±1.0</td><td>3583</td><td>COYNE</td><td>71 HBC</td><td>3.7 π<sup>+</sup> p → pπ<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr></tbody></table>

¹Update of AKHMETSHIN 00C.

²From the combined fit of ANTONELLI 92, ACHASOV 01E, ACHASOV 02E, and ACHASOV 03D data on the $π^+π^-π^0$ and ANTONELLI 92 on the $ωπ^+π^-$ final states. Supersedes ACHASOV 99E and ACHASOV 02E.

³The values were extracted from a dispersively improved Breit-Wigner parameterization and do not include vacuum polarization. Inclusion of vacuum polarization gives 8.63 ± 0.05 MeV.
⁴ The values were extracted from a dispersively improved Breit-Wigner parameterization and do not include vacuum polarization.

⁵ From the $\rho-\omega$ interference in the $\pi^+\pi^-$ mass spectrum using the Breit-Wigner for the $\omega$ and leaving its mass and width as free parameters of the fit.

⁶ Systematic uncertainties underestimated.

⁷ Relativistic Breit-Wigner includes radiative corrections. Systematic uncertainties not estimated.

⁸ Systematic uncertainties not estimated.

⁹ Observed by threshold-crossing technique. Mass resolution is 4.8 MeV FWHM.

## $\omega(782)$ DECAY MODES

<table><thead><tr><th>Mode</th><th>Fraction (Γ<sub>j</sub>/Γ)</th><th>Scale factor/<br>Confidence level</th></tr></thead><tbody><tr><td>Γ<sub>1</sub></td><td>π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td><td>(89.2 ± 0.7) %</td></tr><tr><td>Γ<sub>2</sub></td><td>π<sup>0</sup>γ</td><td>(8.35 ± 0.27) %</td><td>S=2.2</td></tr><tr><td>Γ<sub>3</sub></td><td>π<sup>+</sup>π<sup>-</sup></td><td>(1.53 ± 0.12) %</td><td>S=1.2</td></tr><tr><td>Γ<sub>4</sub></td><td>neutrals (excluding π<sup>0</sup>γ)</td><td>(7.8 ± 4) × 10<sup>-3</sup></td><td>S=1.1</td></tr><tr><td>Γ<sub>5</sub></td><td>ηγ</td><td>(4.5 ± 0.4) × 10<sup>-4</sup></td><td>S=1.1</td></tr><tr><td>Γ<sub>6</sub></td><td>π<sup>0</sup>e<sup>+</sup>e<sup>-</sup></td><td>(7.7 ± 0.6) × 10<sup>-4</sup></td><td>S=1.1</td></tr><tr><td>Γ<sub>7</sub></td><td>π<sup>0</sup>μ<sup>+</sup>μ<sup>-</sup></td><td>(1.34 ± 0.18) × 10<sup>-4</sup></td><td>S=1.5</td></tr><tr><td>Γ<sub>8</sub></td><td>ηe<sup>+</sup>e<sup>-</sup></td><td></td><td></td></tr><tr><td>Γ<sub>9</sub></td><td>e<sup>+</sup>e<sup>-</sup></td><td>(7.38 ± 0.22) × 10<sup>-5</sup></td><td>S=1.9</td></tr><tr><td>Γ<sub>10</sub></td><td>π<sup>+</sup>π<sup>-</sup>π<sup>0</sup>π<sup>0</sup></td><td>&lt; 2 × 10<sup>-4</sup></td><td>CL=90%</td></tr><tr><td>Γ<sub>11</sub></td><td>π<sup>+</sup>π<sup>-</sup>γ</td><td>&lt; 3.6 × 10<sup>-3</sup></td><td>CL=95%</td></tr><tr><td>Γ<sub>12</sub></td><td>π<sup>+</sup>π<sup>-</sup>π<sup>+</sup>π<sup>-</sup></td><td>&lt; 1 × 10<sup>-3</sup></td><td>CL=90%</td></tr><tr><td>Γ<sub>13</sub></td><td>π<sup>0</sup>π<sup>0</sup>γ</td><td>(6.7 ± 1.1) × 10<sup>-5</sup></td><td>CL=90%</td></tr><tr><td>Γ<sub>14</sub></td><td>ηπ<sup>0</sup>γ</td><td>&lt; 3.3 × 10<sup>-5</sup></td><td>CL=90%</td></tr><tr><td>Γ<sub>15</sub></td><td>μ<sup>+</sup>μ<sup>-</sup></td><td>(7.4 ± 1.8) × 10<sup>-5</sup></td><td>CL=95%</td></tr><tr><td>Γ<sub>16</sub></td><td>3γ</td><td>&lt; 1.9 × 10<sup>-4</sup></td><td>CL=95%</td></tr></tbody></table>

### Charge conjugation (C) violating modes

<table><tbody><tr><td>Γ<sub>17</sub></td><td>ηπ<sup>0</sup></td><td>C</td><td>&lt; 2.1</td><td>× 10<sup>-4</sup></td><td>CL=90%</td></tr><tr><td>Γ<sub>18</sub></td><td>2π<sup>0</sup></td><td>C</td><td>&lt; 2.2</td><td>× 10<sup>-4</sup></td><td>CL=90%</td></tr><tr><td>Γ<sub>19</sub></td><td>3π<sup>0</sup></td><td>C</td><td>&lt; 2.3</td><td>× 10<sup>-4</sup></td><td>CL=90%</td></tr><tr><td>Γ<sub>20</sub></td><td>invisible</td><td></td><td>&lt; 7</td><td>× 10<sup>-5</sup></td><td>CL=90%</td></tr></tbody></table>

## CONSTRAINED FIT INFORMATION

An overall fit to 15 branching ratios uses 48 measurements and one constraint to determine 10 parameters. The overall fit has a $\chi^2 = 48.0$ for 39 degrees of freedom.

The following off-diagonal array elements are the correlation coefficients $\langle\delta x_i \delta x_j\rangle / (\delta x_i \delta x_j)$, in percent, from the fit to the branching fractions, $x_i \equiv \Gamma_i/\Gamma_{total}$. The fit constrains the $x_i$ whose labels appear in this array to sum to one.

<figure><img src="image_441.png" /></figure>

## $\omega(782)$ PARTIAL WIDTHS

$$ \Gamma(\pi^0\gamma) \qquad \Gamma_2 \qquad \begin{array}{c} \text{VALUE (keV)} \\ \text{EVTS} \end{array} \qquad \begin{array}{c} \text{DOCUMENT ID} \\ \text{TECN} \end{array} \qquad \begin{array}{c} \text{COMMENT} \\ \text{COMMENT} \end{array} $$

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tbody><tr><td>880 ± 50</td><td>7815</td><td>1 ACHASOV</td><td>13</td><td>SND</td><td>1.05-2.00 e<sup>+</sup>e<sup>-</sup> → π<sup>0</sup>π<sup>0</sup>γ</td></tr><tr><td>788 ± 12 ± 27</td><td>36500</td><td>2 ACHASOV</td><td>03</td><td>SND</td><td>0.60-0.97 e<sup>+</sup>e<sup>-</sup> → π<sup>0</sup>γ</td></tr><tr><td>764 ± 51</td><td>10625</td><td>DOLINSKY</td><td>89</td><td>ND</td><td>e<sup>+</sup>e<sup>-</sup> → π<sup>0</sup>γ</td></tr></tbody></table>

¹ Systematic uncertainty not estimated.

² Using $\Gamma_\omega = 8.44 \pm 0.09$ MeV and $B(\omega \to \pi^0\gamma)$ from ACHASOV 03.

$$ \Gamma(\eta\gamma) \qquad \Gamma_5 \qquad \begin{array}{c} \text{VALUE (keV)} \\ \text{EVTS} \end{array} \qquad \begin{array}{c} \text{DOCUMENT ID} \\ \text{TECN} \end{array} \qquad \begin{array}{c} \text{COMMENT} \\ \text{COMMENT} \end{array} $$

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tbody><tr><td>6.1 ± 2.5</td><td>1 DOLINSKY</td><td>89</td><td>ND</td><td>e<sup>+</sup>e<sup>-</sup> → ηγ</td></tr></tbody></table>

¹ Using $\Gamma_\omega = 8.4 \pm 0.1$ MeV and $B(\omega \to \eta\gamma)$ from DOLINSKY 89.

$$ \Gamma(e^+e^-) \qquad \Gamma_9 \qquad \begin{array}{c} \text{VALUE (keV)} \\ \text{EVTS} \end{array} \qquad \begin{array}{c} \text{DOCUMENT ID} \\ \text{TECN} \end{array} \qquad \begin{array}{c} \text{COMMENT} \\ \text{COMMENT} \end{array} $$

### 0.60 ± 0.02 OUR EVALUATION

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tbody><tr><td>0.591 ± 0.015</td><td>11200</td><td>1,2 AKHMETSHIN 04</td><td>CMD2</td><td>e<sup>+</sup>e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr><tr><td>0.653 ± 0.003 ± 0.021</td><td>1.2M</td><td>3 ACHASOV</td><td>03D</td><td>RVUE</td><td>0.44-2.00 e<sup>+</sup>e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr><tr><td>0.600 ± 0.031</td><td>10625</td><td>DOLINSKY</td><td>89</td><td>ND</td><td>e<sup>+</sup>e<sup>-</sup> → π<sup>0</sup>γ</td></tr></tbody></table>

¹ Using $B(\omega \to \pi^+\pi^-\pi^0) = 0.891 \pm 0.007$ and $\Gamma_{total} = 8.44 \pm 0.09$ MeV.

² Update of AKHMETSHIN 00C.

³ Using ACHASOV 03, ACHASOV 03D and $B(\omega \to \pi^+\pi^-) = (1.70 \pm 0.28)\%$.

## $\omega(782)$ $\Gamma(i)\Gamma(e^+e^-)/\Gamma(\text{total})$

$$ \Gamma(\pi^+\pi^-\pi^0) \times \Gamma(e^+e^-)/\Gamma_{\text{total}} \qquad \Gamma_1\Gamma_9/\Gamma \qquad \begin{array}{c} \text{VALUE (eV)} \\ \text{EVTS} \end{array} \qquad \begin{array}{c} \text{DOCUMENT ID} \\ \text{TECN} \end{array} \qquad \begin{array}{c} \text{COMMENT} \\ \text{COMMENT} \end{array} $$

<table><tbody><tr><td>569.8 ± 3.1 ± 8.2</td><td>1 LEES</td><td>21B</td><td>BABR</td><td>10.5 e<sup>+</sup>e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup>γ</td></tr></tbody></table>

¹ From the cross section for $e^+e^- \to \pi^+\pi^-\pi^0$ with contributions from $\rho(770)$, $\omega(782)$, $\phi(1020)$, $\omega(1420)$, and $\omega(1650)$.

## $\omega(782)$ $\Gamma(e^+e^-)\Gamma(i)/\Gamma^2(\text{total})$

$$ \Gamma(e^+e^-)/\Gamma_{\text{total}} \times \Gamma(\pi^+\pi^-\pi^0)/\Gamma_{\text{total}} \qquad \Gamma_9/\Gamma \times \Gamma_1/\Gamma \qquad \begin{array}{c} \text{VALUE (units 10<sup>-5</sup>)} \\ \text{EVTS} \end{array} \qquad \begin{array}{c} \text{DOCUMENT ID} \\ \text{TECN} \end{array} \qquad \begin{array}{c} \text{COMMENT} \\ \text{COMMENT} \end{array} $$

6.59 ± 0.19 OUR FIT Error includes scale factor of 2.1.

6.36 ± 0.14 OUR AVERAGE Error includes scale factor of 1.3. See the ideogram below.

<table><tbody><tr><td>6.24 ± 0.11 ± 0.08</td><td>11.2k</td><td>1 AKHMETSHIN 04</td><td>CMD2</td><td>e<sup>+</sup>e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr><tr><td>6.74 ± 0.04 ± 0.24</td><td>1.2M</td><td>2,3 ACHASOV</td><td>03D</td><td>RVUE</td><td>0.44-2.00 e<sup>+</sup>e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr><tr><td>6.37 ± 0.35</td><td>2 DOLINSKY</td><td>89</td><td>ND</td><td>e<sup>+</sup>e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr></tbody></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tbody><tr><td>6.20 ± 0.13</td><td>4 BENAYOUN</td><td>10</td><td>RVUE</td><td>0.4-1.05 e<sup>+</sup>e<sup>-</sup></td></tr><tr><td>6.70 ± 0.06 ± 0.27</td><td>5 AUBERT, B</td><td>04N</td><td>BABR</td><td>10.6 e<sup>+</sup>e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup>γ</td></tr><tr><td>6.45 ± 0.24</td><td>6 BARKOV</td><td>87</td><td>CMD</td><td>e<sup>+</sup>e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr><tr><td>5.79 ± 0.42</td><td>1488</td><td>7 KURDADZE</td><td>83B</td><td>OLYA</td><td>e<sup>+</sup>e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr><tr><td>5.89 ± 0.54</td><td>433</td><td>8 CORDIER</td><td>80</td><td>DM1</td><td>e<sup>+</sup>e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr><tr><td>7.54 ± 0.84</td><td>451</td><td>6 BENAKSAS</td><td>72B</td><td>OSPK</td><td>e<sup>+</sup>e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup></td></tr></tbody></table>

¹ Update of AKHMETSHIN 00C.

² Recalculated by us from the cross section in the peak.

³ From the combined fit of ANTONELLI 92, ACHASOV 01E, ACHASOV 02E, and ACHASOV 03D data on the $\pi^+\pi^-\pi^0$ and ANTONELLI 92 on the $\omega\pi^+\pi^-$ final states. Supersedes ACHASOV 99E and ACHASOV 02E.

⁴ A simultaneous fit of $e^+e^- \to \pi^+\pi^-$, $\pi^+\pi^-\pi^0$, $\pi^0\gamma$, $\eta\gamma$ data.

⁵ Superseded by LEES 21B.

⁶ Recalculated by us from the cross section in the peak. Systematic uncertainties underestimated.

⁷ Recalculated by us from the cross section in the peak. Systematic uncertainties not estimated.

### WEIGHTED AVERAGE
6.36±0.14 (Error scaled by 1.3)

<figure><img src="image_442.png" /></figure>

Values above of weighted average, error, and scale factor are based upon the data in this ideogram only. They are not necessarily the same as our 'best' values, obtained from a least-squares constrained fit utilizing measurements of other (related) quantities as additional information.

$\Gamma(e^+e^-)/\Gamma_{\text{total}} \times \Gamma(\pi^+\pi^-\pi^0)/\Gamma_{\text{total}}$ (units 10<sup>-5</sup>)

$$ \Gamma(e^+e^-)/\Gamma_{\text{total}} \times \Gamma(\pi^0\gamma)/\Gamma_{\text{total}} \qquad \Gamma_9/\Gamma \times \Gamma_2/\Gamma \qquad \begin{array}{c} \text{VALUE (units 10<sup>-5</sup>)} \\ \text{EVTS} \end{array} \qquad \begin{array}{c} \text{DOCUMENT ID} \\ \text{TECN} \end{array} \qquad \begin{array}{c} \text{COMMENT} \\ \text{COMMENT} \end{array} $$

6.16 ± 0.14 OUR FIT Error includes scale factor of 1.8.

6.34 ± 0.10 OUR AVERAGE

<table><tbody><tr><td>6.336 ± 0.056 ± 0.089</td><td>1 ACHASOV</td><td>16A</td><td>SND</td><td>0.60-1.38 e<sup>+</sup>e<sup>-</sup> → π<sup>0</sup>γ</td></tr><tr><td>6.47 ± 0.14 ± 0.39</td><td>18k</td><td>AKHMETSHIN 05</td><td>CMD2</td><td>0.60-1.38 e<sup>+</sup>e<sup>-</sup> → π<sup>0</sup>γ</td></tr><tr><td>6.34 ± 0.21 ± 0.21</td><td>10k</td><td>2 DOLINSKY</td><td>89</td><td>ND</td><td>e<sup>+</sup>e<sup>-</sup> → π<sup>0</sup>γ</td></tr></tbody></table>
# Meson Particle Listings

## ω(782)

• • • We do not use the following data for averages, fits, limits, etc. • • •

6.80 ± 0.13 3 BENAYOUN 10 RVUE 0.4-1.05 e⁺e⁻

6.50 ± 0.11 ± 0.20 36k 4 ACHASOV 03 SND 0.60-0.97 e⁺e⁻ → π⁰γ

¹ From the VMD model with the interfering ρ(770), ω(782), φ(1020), and an additional resonance describing the total contribution of the ρ(1450) and ω(1420) states. Supersedes ACHASOV 03.

² Recalculated by us from the cross section in the peak.

³ A simultaneous fit of e⁺e⁻ → π⁺π⁻, π⁺π⁻π⁰, π⁰γ, ηγ data.

⁴ Using $\sigma(\phi \to \pi^0 \gamma)$ from ACHASOV 00 and $m_\omega = 782.57$ MeV in the model with the energy-independent phase of $\rho\omega$ interference equal to (-10.2 ± 7.0)°.

$$ \Gamma(e^+ e^-)/\Gamma_{\text{total}} \times \Gamma(\pi^+ \pi^-)/\Gamma_{\text{total}} \quad \Gamma_9/\Gamma \times \Gamma_3/\Gamma $$

VALUE (units 10⁻⁶) EVTS DOCUMENT ID TECN COMMENT

### 1.28 ±0.05 OUR AVERAGE

1.318 ± 0.051 ± 0.021

1 ACHASOV 21 SND e⁺e⁻ → π⁺π⁻

1.225 ± 0.058 ± 0.041

2 ACHASOV 06 SND e⁺e⁻ → π⁺π⁻

• • • We do not use the following data for averages, fits, limits, etc. • • •

1.166 ± 0.036

3 BENAYOUN 13 RVUE 0.4-1.05 e⁺e⁻

1.05 ± 0.08

4 DAVIER 13 RVUE e⁺e⁻ → π⁺π⁻(γ)

¹ From a fit of the cross section in the energy range 0.525 < $\sqrt{s}$ < 0.883 GeV parameterized by the sum of the Breit-Wigner amplitudes for the $\rho(770)$, $\omega$ and $\rho(1450)$ resonances. The measured phase of the $\rho(770)$-$\omega$ interference is (110.7 ± 1.5 ± 1.0)°.

² Supersedes ACHASOV 05a.

³ A simultaneous fit to e⁺e⁻ → π⁺π⁻, π⁺π⁻π⁰, π⁰γ, ηγ, $K\bar{K}$, and $\tau^- \to \pi^-\pi^0\nu_\tau$ data. Supersedes BENAYOUN 10.

⁴ From e⁺e⁻ → π⁺π⁻(γ) data of LEES 12G.

$$ \Gamma(e^+ e^-)/\Gamma_{\text{total}} \times \Gamma(\eta\gamma)/\Gamma_{\text{total}} \quad \Gamma_9/\Gamma \times \Gamma_5/\Gamma $$

VALUE (units 10⁻⁸) EVTS DOCUMENT ID TECN COMMENT

3.32 ±0.28 OUR FIT Error includes scale factor of 1.1.

### 3.18 ±0.28 OUR AVERAGE

3.10 ± 0.31 ± 0.11

1 ACHASOV 07B SND 0.6-1.38 e⁺e⁻ → ηγ

3.17 ± 1.85 ± 0.21

2 AKHMETSHIN 05 CMD2 0.60-1.38 e⁺e⁻ → ηγ

3.17 ± 1.31

3.4 AKHMETSHIN 01B CMD2 e⁺e⁻ → ηγ

3.41 ± 0.52 ± 0.21

• • • We do not use the following data for averages, fits, limits, etc. • • •

4.50 ± 0.10

5 BENAYOUN 10 RVUE 0.4-1.05 e⁺e⁻

¹ From a combined fit of $\sigma(e^+ e^- \to \eta\gamma)$ with $\eta \to 3\pi^0$ and $\eta \to \pi^+\pi^-\pi^0$, and fixing $B(\eta \to 3\pi^0) / B(\eta \to \pi^+\pi^-\pi^0) = 1.44 \pm 0.04$. Recalculated by us from the cross section at the peak. Supersedes ACHASOV 00d and ACHASOV 06a.

² From the $\eta \to 2\gamma$ decay and using $B(\eta \to \gamma\gamma) = 39.43 \pm 0.26\%$.

³ From the $\eta \to 3\pi^0$ decay and using $B(\eta \to 3\pi^0) = (32.24 \pm 0.29) \times 10^{-2}$.

⁴ The combined fit from 600 to 1380 MeV taking into account $\rho(770)$, $\omega(782)$, $\phi(1020)$, and $\rho(1450)$ (mass and width fixed at 1450 MeV and 310 MeV respectively).

⁵ A simultaneous fit of e⁺e⁻ → π⁺π⁻, π⁺π⁻π⁰, π⁰γ, ηγ data.

$$ \Gamma(e^+ e^-)/\Gamma_{\text{total}} \times \Gamma(\mu^+ \mu^-)/\Gamma_{\text{total}} \quad \Gamma_9/\Gamma \times \Gamma_{15}/\Gamma $$

VALUE (units 10⁻⁹) EVTS DOCUMENT ID TECN COMMENT

### 4.3 ±1.8 ±2.2

1 ANASTASI 17 KLOE e⁺e⁻ → μ⁺μ⁻γ

¹ From a fit of the real part of the vacuum polarization by a sum of the leptonic and hadronic contributions, where the hadronic contribution is parametrized as a sum of Breit-Wigner resonances $\omega(782)$, $\phi(1020)$ and using a GOUNARIS 68 parametrization for the $\rho(770)$, and a non-resonant term.

## ω(782) BRANCHING RATIOS

$$ \Gamma(\pi^+ \pi^- \pi^0)/\Gamma_{\text{total}} \quad \Gamma_1/\Gamma $$

NIECKNIG 12 describes final-state interactions between the three pions in a dispersive framework using data on the $\pi\pi$ P-wave scattering phase shift.

VALUE EVTS DOCUMENT ID TECN COMMENT

• • • We do not use the following data for averages, fits, limits, etc. • • •

0.9024 ± 0.0019

1 AMBROSINO 08G KLOE 1.0-1.03 e⁺e⁻ → π⁺π⁻ 2π⁰, 2π⁰γ

0.8965 ± 0.0016 ± 0.0048

2,3 ACHASOV 03D RVUE 0.44-2.00 e⁺e⁻ → π⁺π⁻π⁰

0.880 ± 0.020 ± 0.032

3,4 AKHMETSHIN 00C CMD2 e⁺e⁻ → π⁺π⁻π⁰

0.8942 ± 0.0062

3 DOLINSKY 89 ND e⁺e⁻ → π⁺π⁻π⁰

¹ Not independent of $\Gamma(\pi^0\gamma) / \Gamma(\pi^+\pi^-\pi^0)$ from AMBROSINO 08G.

² Using ACHASOV 03, ACHASOV 03d and B($\eta \to \pi^+\pi^0$) = (1.70 ± 0.28)%.

³ Not independent of the corresponding $\Gamma(e^+ e^-) \times \Gamma(\pi^+ \pi^- \pi^0)/\Gamma_{\text{total}}^2$.

⁴ Using $\Gamma(e^+ e^-) = 0.60 \pm 0.02$ keV.

$$ \Gamma(\pi^0\gamma)/\Gamma_{\text{total}} \quad \Gamma_2/\Gamma $$

VALUE (units 10⁻⁲) EVTS DOCUMENT ID TECN COMMENT

• • • We do not use the following data for averages, fits, limits, etc. • • •

8.88 ± 0.18

1 ACHASOV 16A SND 0.60-1.38 e⁺e⁻ → π⁰γ

8.09 ± 0.14

2 AMBROSINO 08G KLOE e⁺e⁻ → π⁺π⁻ 2π⁰, 2π⁰γ

9.06 ± 0.20 ± 0.57

3,4 AKHMETSHIN 05 CMD2 0.60-1.38 e⁺e⁻ → π⁰γ

9.34 ± 0.15 ± 0.31

4 ACHASOV 03 SND 0.60-0.97 e⁺e⁻ → π⁰γ

8.65 ± 0.16 ± 0.42

5.6 ACHASOV 03D RVUE 0.44-2.00 e⁺e⁻ → π⁺π⁻π⁰

8.39 ± 0.24

7 BENAYOUN 96 RVUE e⁺e⁻ → π⁰γ

8.88 ± 0.62

4 DOLINSKY 89 ND e⁺e⁻ → π⁰γ

¹ Using $B(\omega \to e^+e^-)$ from PDG 15. Supersedes ACHASOV 03.

² Not independent of $\Gamma(\pi^0\gamma) / \Gamma(\pi^+\pi^-\pi^0)$ from AMBROSINO 08G.

³ Using $B(\omega \to e^+e^-) = (7.14 \pm 0.13) \times 10^{-5}$.

⁴ Not independent of the corresponding $\Gamma(e^+ e^-) \times \Gamma(\pi^0\gamma)/\Gamma_{\text{total}}^2$.

⁵ Using ACHASOV 03, ACHASOV 03d and $B(\omega \to \pi^+\pi^-) = (1.70 \pm 0.28)\%$.

⁶ Not independent of the corresponding $\Gamma(e^+ e^-) \times \Gamma(\pi^+\pi^-\pi^0)/\Gamma_{\text{total}}^2$.

⁷ Reanalysis of DRUZHININ 84, DOLINSKY 89, DOLINSKY 91 taking into account the triangle anomaly contributions.

$$ \Gamma(\pi^0\gamma)/\Gamma(\pi^+\pi^-\pi^0) \quad \Gamma_2/\Gamma_1 $$

VALUE (units 10⁻²) EVTS DOCUMENT ID TECN COMMENT

9.35 ±0.30 OUR FIT Error includes scale factor of 2.4.

9.05 ±0.27 OUR AVERAGE Error includes scale factor of 1.8.

8.97 ± 0.16 AMBROSINO 08G KLOE e⁺e⁻ → π⁺π⁻ 2π⁰, 2π⁰γ

9.94 ±0.36 ± 0.38 1 AULCHENKON 00A SND e⁺e⁻ → π⁺π⁻ 2π⁰, 2π⁰γ

8.4 ± 1.3 KEYNE 76 CNTR $\pi^- p \to \omega n$

10.9 ± 2.5 BENAKSAS 72C OSPK e⁺e⁻ → π⁰γ

8.1 ± 2.0 BALDIN 71 HLBC 2.9 $\pi^+ p$

13 ± 4 JACQUET 69B HLBC 2.05 $\pi^+ p \to \pi^+ \rho \omega$

• • • We do not use the following data for averages, fits, limits, etc. • • •

9.7 ± 0.2 ± 0.5 2,3 ACHASOV 03D RVUE 0.44-2.00 e⁺e⁻ → π⁺π⁻π⁰

9.9 ± 0.7 2 DOLINSKY 89 ND e⁺e⁻ → π⁰γ

¹ From $\sigma_0^\omega \pi^0 \to \pi^0 \pi^0 \gamma(m_\phi)/\sigma_0^\omega \pi^0 \to \pi^+\pi^-\pi^0 \pi^0(m_\phi)$ with a phase-space correction factor of 1/1.023.

² Not independent of the corresponding $\Gamma(e^+ e^-) \times \Gamma(\pi^0\gamma)/\Gamma_{\text{total}}^2$.

³ Using ACHASOV 03. Based on 1.2M events.

$$ \Gamma(\pi^+ \pi^-)/\Gamma_{\text{total}} \quad \Gamma_3/\Gamma $$

See also $\Gamma(\pi^+ \pi^-) / \Gamma(\pi^+ \pi^- \pi^0)$.

VALUE (units 10⁻²) EVTS DOCUMENT ID TECN COMMENT

1.53 ±0.12 OUR FIT Error includes scale factor of 1.2.

1.49 ±0.13 OUR AVERAGE Error includes scale factor of 1.3. See the ideogram below.

1.46 ± 0.12 ± 0.02 900k 1 AKHMETSHIN 07 e⁺e⁻ → π⁺π⁻

1.30 ±0.24 ± 0.05 11.2k 2 AKHMETSHIN 04 CMD2 e⁺e⁻ → π⁺π⁻

2.38 ±1.77 ± 0.18 5.4k 3 ACHASOV 02E SND 1.1-1.38 e⁺e⁻ → π⁺π⁻π⁰

2.3 ± 0.5 BARKOV 85 OLYA e⁺e⁻ → π⁺π⁻

1.6 ± 0.9 ± 0.7 QUENZER 78 DM1 e⁺e⁻ → π⁺π⁻

3.6 ± 1.9 BENAKSAS 72 OSPK e⁺e⁻ → π⁺π⁻

• • • We do not use the following data for averages, fits, limits, etc. • • •

1.29 ±0.22 ± 0.03 970k 4,5 ABLIKIM 18C BES3 $\eta'(958) \to \gamma\pi^+\pi^-$

1.28 ±0.22 ± 0.03 970k 6,7 ABLIKIM 18C BES3 $\eta'(958) \to \gamma\pi^+\pi^-$

1.52 ± 0.08 8 HANHART 18 RVUE e⁺e⁻ → π⁺π⁻

1.75 ± 0.11 4.5M 9 ACHASOV 05A SND e⁺e⁻ → π⁺π⁻

2.01 ± 0.29 BENAYOUN 03 RVUE e⁺e⁻ → π⁺π⁻

1.9 ± 0.3 GARDNER 99 RVUE e⁺e⁻ → π⁺π⁻

2.3 ± 0.4 BENAYOUN 98 RVUE e⁺e⁻ → π⁺π⁻, $\mu^+\mu^-$

1.0 ± 0.11 WICKLUND 78 ASPK 3,4,6 $\pi^\pm N$

1.22 ± 0.30 ALVENSLEB... 71 CNTR Photoproduction

1.3 ± 1.2 ± 0.9 MOFFEIT 71 HBC 2.8,4.7 $\gamma p$

14 BIGGS 70B CNTR 4.2 $\gamma C \to \pi^+\pi^- C$

80.0 ± 0.28 ± 0.20

1.19 ± 0.19 ± 0.19

1.19 ± 0.22 ± 0.03 970k 8 BES3 $\eta'(958) \to \gamma\pi^+\pi^-$

1.19 ± 0.22 ± 0.03 970k 6,7 ABLIKIM 18C BES3 $\eta'(958) \to \gamma\pi^+\pi^-$

1.52 ± 0.08 8 HANHART 18 RVUE e⁺e⁻ → π⁺π⁻

1.75 ± 0.11 4.5M 9 ACHASOV 05A SND e⁺e⁻ → π⁺π⁻

2.01 ± 0.29 BENAYOUN 03 RVUE e⁺e⁻ → π⁺π⁻

1.9 ± 0.3 GARDNER 99 RVUE e⁺e⁻ → π⁺π⁻

12.3 ± 0.4 BENAYOUN 98 RVUE e⁺e⁻ → π⁺π⁻, $\mu^+\mu^-$

1.0 ± 0.11 WICKLUND 78 ASPK 3,4,6 $\pi^\pm N$

1.22 ± 0.30 ALVENSLEB... 71 CNTR Photoproduction

1.3 ± 1.2 ± 0.9 MOFFEIT 71 HBC 2.8,4.7 $\gamma p$

14 BIGGS 70B CNTR 4.2 $\gamma C \to \pi^+\pi^- C$

## WEIGHTED AVERAGE
1.49±0.13 (Error scaled by 1.3)

Values above of weighted average, error, and scale factor are based upon the data in this ideogram only. They are not necessarily the same as our 'best' values, obtained from a least-squares constrained fit utilizing measurements of other (related) quantities as additional information.

<figure><img src="image_443.png" /></figure>

(Confidence Level = 0.194)

## $\Gamma(\pi^+\pi^-)/\Gamma_{\text{total}}$ (units 10⁻²)

¹ A combined fit of AKHMETSHIN 01, AULCHENKON 06, and AULCHENKON 05.

² Update of AKHMETSHIN 02.

³ From the $m_{\pi^+\pi^-}$ spectrum taking into account the interference of the $\rho\pi$ and $\omega\pi$ amplitudes.

⁴ From a fit to $\pi^+\pi^-$ mass using $\rho(770)$ (parametrized with the Gounaris-Sakurai approach), $\omega(782)$, and box anomaly components.

⁵ ABLIKIM 18c reports $[\Gamma(\omega(782) \to \pi^+\pi^-) / \Gamma_{\text{total}}] \times [B(\eta'(958) \to \omega\gamma)] = (3.25 \pm 0.21 \pm 0.52) \times 10^{-4}$ which we divide by our best value $B(\eta'(958) \to \omega\gamma) = (2.52 \pm 0.21 \pm 0.52) \times 10^{-4}$.
0.07) × 10⁻². Our first error is their experiment's error and our second error is the systematic error from using our best value.

⁶From a fit to π⁺π⁻ mass using ρ(770) (parametrized with the Gounaris-Sakura approach), ω(782), and ρ(1450) components.

⁷ ABLIKIM 18c reports [Γ(ω(782) → π⁺π⁻)/Γ<sub>total</sub>] × [B(η'(958) → ωγ)] = (3.22 ± 0.21 ± 0.52) × 10⁻⁴ which we divide by our best value B(η'(958) → ωγ) = (2.52 ± 0.07) × 10⁻². Our first error is their experiment's error and our second error is the systematic error from using our best value.

⁸Dispersive analysis. Value extracted from average of data from AUBERT 09AS, AKHMETSHIN 07, ACHASOV 06, AMBROSINO 11A, BABUSCI 13D, ABLIKIM 16B normalised by PDG 16 evaluation for Γ(ω → e⁺e⁻).

⁹Using Γ(ω → e⁺e⁻) from the 2004 Edition of this Review (PDG 04).

¹⁰Using the data of AKHMETSHIN 02 in the hidden local symmetry model.

¹¹Using the data of BARKOV 85.

¹²Using the data of BARKOV 85 in the hidden local symmetry model.

¹³From a model-dependent analysis assuming complete coherence.

¹⁴Re-evaluated under Γ(π⁺π⁻)/Γ(π⁺π⁻π⁰) by BEHREND 71 using more accurate ω → ρ photoproduction cross-section ratio.

$$ \Gamma(\pi^{+}\pi^{-})/\Gamma(\pi^{+}\pi^{-}\pi^{0}) \qquad \Gamma_{3}/\Gamma_{1} $$

See also Γ(π⁺π⁻)/Γ<sub>total</sub>.

<table><thead><tr><th>VALUE</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead></table>

0.0172±0.0014 OUR FIT Error includes scale factor of 1.2.

0.026 ±0.005 OUR AVERAGE

<table><tr><td>0.021</td><td>+0.028</td><td>1,2</td><td>RATCLIFF</td><td>72</td><td>ASPK</td><td>15 π<sup>-</sup> p → n2π</td></tr><tr><td>0.028</td><td>+0.006</td><td>1</td><td>BEHREND</td><td>71</td><td>ASPK</td><td>Photoproduction</td></tr><tr><td>0.022</td><td>+0.009</td><td>3</td><td>ROOS</td><td>70</td><td>RVUE</td><td></td></tr></table>

¹The fitted width of these data is 160 MeV in agreement with present average, thus the ω contribution is overestimated. Assuming ρ width 145 MeV.

²Significant interference effect observed. NB of ω → 3π comes from an extrapolation.

³ROOS 70 combines ABRAMOVICH 70 and BIZZARRI 70.

$$ \Gamma(\pi^{+}\pi^{-})/\Gamma(\pi^{0}\gamma) \qquad \Gamma_{3}/\Gamma_{2} $$

<table><thead><tr><th>VALUE</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>0.20±0.04</td><td>1.98M</td><td>1</td><td>ALOISIO</td><td>03</td><td>KLOE</td><td>1.02 e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup> π<sup>-</sup> π<sup>0</sup> →</td></tr></tbody></table>

¹Using the data of ALOISIO 02D.

$$ \Gamma(\text{neutrals})/\Gamma(\text{total}) \qquad (\Gamma_2+\Gamma_4)/\Gamma $$

<table><thead><tr><th>VALUE</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead></table>

0.091±0.006 OUR FIT

0.081±0.011 OUR AVERAGE

<table><tr><td>0.075±0.025</td><td>BIZZARRI</td><td>71</td><td>HBC</td><td>0.0 p p̄</td></tr><tr><td>0.079±0.019</td><td>DEINET</td><td>69B</td><td>OSPK</td><td>1.5 π<sup>-</sup> p</td></tr><tr><td>0.084±0.015</td><td>BOLLINI</td><td>68C</td><td>CNTR</td><td>2.1 π<sup>-</sup> p</td></tr><tr><td colspan="5">• • • We do not use the following data for averages, fits, limits, etc. • • •</td></tr><tr><td>0.073±0.018</td><td>42</td><td>BASILE</td><td>72B</td><td>CNTR</td><td>1.67 π<sup>-</sup> p</td></tr></table>

$$ \Gamma(\text{neutrals})/\Gamma(\pi^{+}\pi^{-}\pi^{0}) \qquad (\Gamma_2+\Gamma_4)/\Gamma_1 $$

<table><thead><tr><th>VALUE</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead></table>

0.102±0.008 OUR FIT

0.103+0.011-0.010 OUR AVERAGE

<table><tr><td>0.15</td><td>±0.04</td><td>46</td><td>AGUILAR...</td><td>72B</td><td>HBC</td><td>3.9,4.6 K<sup>-</sup> p</td></tr><tr><td>0.10</td><td>±0.03</td><td>19</td><td>BARASH</td><td>67B</td><td>HBC</td><td>0.0 p p̄</td></tr><tr><td>0.134±0.026</td><td></td><td>850</td><td>DIGIUGNO</td><td>66B</td><td>CNTR</td><td>1.4 π<sup>-</sup> p</td></tr><tr><td>0.097±0.016</td><td></td><td>348</td><td>FLATTE</td><td>66</td><td>HBC</td><td>1.4 - 1.7 K<sup>-</sup> p → ΛMM</td></tr><tr><td>0.06</td><td>+0.05</td><td></td><td>JAMES</td><td>66</td><td>HBC</td><td>2.1 π<sup>+</sup> p</td></tr><tr><td>0.08</td><td>±0.03</td><td>35</td><td>KRAEMER</td><td>64</td><td>DBC</td><td>1.2 π<sup>+</sup> d</td></tr><tr><td colspan="5">• • • We do not use the following data for averages, fits, limits, etc. • • •</td></tr><tr><td>0.11</td><td>±0.02</td><td>20</td><td>BUSCHBECK</td><td>63</td><td>HBC</td><td>1.5 K<sup>-</sup> p</td></tr></table>

$$ \Gamma(\pi^{0}\gamma)/\Gamma(\text{neutrals}) \qquad \Gamma_{2}/(\Gamma_{2}+\Gamma_{4}) $$

<table><thead><tr><th>VALUE</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>0.78±0.07</td><td>1</td><td>DAKIN</td><td>72</td><td>OSPK</td><td>1.4 π<sup>-</sup> p → nMM</td></tr><tr><td>>0.81</td><td>90</td><td>DEINET</td><td>69B</td><td>OSPK</td><td></td></tr></table>

¹Error statistical only. Authors obtain good fit also assuming π⁰γ as the only neutral decay.

$$ \Gamma(\text{neutrals})/\Gamma(\text{charged particles}) \qquad (\Gamma_2+\Gamma_4)/(\Gamma_1+\Gamma_3) $$

<table><thead><tr><th>VALUE</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>0.100±0.008 OUR FIT</td><td></td><td></td><td></td><td></td></tr></tbody></table>

0.124±0.021 FELDMAN 67C OSPK 1.2 π⁻ p

$$ \Gamma(\eta)/\Gamma_{\text{total}} \qquad \Gamma_{5}/\Gamma $$

<table><thead><tr><th>VALUE (units 10<sup>-4</sup>)</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead></table>

4.5 ±0.4 OUR FIT Error includes scale factor of 1.1.

6.3 ±1.3 OUR AVERAGE Error includes scale factor of 1.2.

<table><tr><td>6.6</td><td>±1.7</td><td>1</td><td>ABELÉ</td><td>97E</td><td>CBAR</td><td>0.0 p p̄ → 5γ</td></tr><tr><td>8.3</td><td>±2.1</td><td></td><td>ALDE</td><td>93</td><td>GAM2</td><td>38 π<sup>-</sup> p → ωn</td></tr></table>

<table><tr><td>3.0</td><td>+2.5</td><td>2</td><td>ANDREWS</td><td>77</td><td>CNTR</td><td>6.7-10 γ Cu</td></tr></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>4.2</td><td>±0.4</td><td>±0.1</td><td>33k</td><td>3</td><td>ACHASOV</td><td>07B</td><td>SND</td><td>0.6-1.38 e<sup>+</sup> e<sup>-</sup> → ηγ</td></tr><tr><td>4.44+2.59</td><td>-1.83</td><td>±0.28</td><td>17.4k</td><td>4,5</td><td>AKHMETSHIN 05</td><td>CMD2</td><td>0.60-1.38 e<sup>+</sup> e<sup>-</sup> → ηγ</td></tr><tr><td>5.10±0.72</td><td>±0.34</td><td>23k</td><td>6</td><td>AKHMETSHIN 01B</td><td>CMD2</td><td>e<sup>+</sup> e<sup>-</sup> → ηγ</td></tr><tr><td>0.7</td><td>to 5.5</td><td></td><td>7</td><td>CASE</td><td>00</td><td>CBAR</td><td>0.0 p p̄ → ηηγ</td></tr><tr><td>6.56+2.41</td><td>2.55</td><td>3525</td><td>2,8</td><td>BENAYOUN</td><td>96</td><td>RVUE</td><td>e<sup>+</sup> e<sup>-</sup> → ηγ</td></tr><tr><td>7.3</td><td>±2.9</td><td></td><td>2.4</td><td>DOLINSKY</td><td>89</td><td>ND</td><td>e<sup>+</sup> e<sup>-</sup> → ηγ</td></tr></table>

¹No flat ηηγ background assumed.

²Solution corresponding to constructive ω-ρ interference.

³ACHASOV 07B reports [Γ(ω(782) → ηγ)/Γ<sub>total</sub>] × [B(ω(782) → e⁺e⁻)] = (3.10 ± 0.31 ± 0.11) × 10⁻⁸ which we divide by our best value B(ω(782) → e⁺e⁻) = (7.38 ± 0.22) × 10⁻⁵. Our first error is their experiment's error and our second error is the systematic error from using our best value. Supersedes ACHASOV 00D and ACHASOV 06A.

⁴Not independent of the corresponding Γ(e⁺e⁻) × Γ(ηγ)/Γ<sub>total</sub>.

⁵Using B(ω → e⁺e⁻) = (7.14 ± 0.13) × 10⁻⁵ and B(η → ηγ) = 39.43 ± 0.26%.

⁶Using B(ω → e⁺e⁻) = (7.07 ± 0.19) × 10⁻⁵ and using B(η → 3π⁰) = (32.24 ± 0.29) × 10⁻². Solution corresponding to constructive ω-ρ interference. The combined fit from 600 to 1380 MeV taking into account ρ(770), ω(782), φ(1020), and ρ(1450) (mass and width fixed at 1450 MeV and 310 MeV respectively). Not independent of the corresponding Γ(e⁺e⁻) × Γ(ηγ)/Γ<sub>total</sub>.

⁷Depending on the degree of coherence with the flat ηηγ background and using B(ω → π⁰γ) = (8.5 ± 0.5) × 10⁻².

⁸Reanalysis of DRUZHININ 84, DOLINSKY 89, DOLINSKY 91 taking into account the triangle anomaly contributions.

$$ \Gamma(\eta\gamma)/\Gamma(\pi^0\gamma) \qquad \Gamma_5/\Gamma_2 $$

<table><thead><tr><th>VALUE</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>0.0098±0.0024</td><td>1</td><td>ALDE</td><td>93</td><td>GAM2</td><td>38 π<sup>-</sup> p → ωn</td></tr><tr><td>0.0082±0.0033</td><td>2</td><td>DOLINSKY</td><td>89</td><td>ND</td><td>e<sup>+</sup> e<sup>-</sup> → ηγ</td></tr><tr><td>0.010</td><td>±0.045</td><td>3</td><td>APEL</td><td>72B</td><td>OSPK</td><td>4-8 π<sup>-</sup> p → n3γ</td></tr></table>

¹Model independent determination.

²Solution corresponding to constructive ω-ρ interference.

$$ \Gamma(\pi^0 e^+ e^-)/\Gamma_{\text{total}} \qquad \Gamma_6/\Gamma $$

<table><thead><tr><th>VALUE (units 10<sup>-4</sup>)</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead></table>

7.7 ±0.6 OUR FIT

7.7 ±0.6 OUR AVERAGE

<table><tr><td>7.61±0.53</td><td>±0.64</td><td>ACHASOV</td><td>08</td><td>SND</td><td>0.36-0.97 e<sup>+</sup> e<sup>-</sup> → π<sup>0</sup> e<sup>+</sup> e<sup>-</sup></td></tr><tr><td>8.19±0.71</td><td>±0.62</td><td>AKHMETSHIN 05A</td><td>CMD2</td><td>ND</td><td>0.72-0.84 e<sup>+</sup> e<sup>-</sup></td></tr><tr><td>5.9</td><td>±1.9</td><td>43</td><td>DOLINSKY</td><td>88</td><td>ND</td><td>e<sup>+</sup> e<sup>-</sup> → π<sup>0</sup> e<sup>+</sup> e<sup>-</sup></td></tr></table>

$$ \Gamma(\pi^0 \mu^+ \mu^-)/\Gamma_{\text{total}} \qquad \Gamma_7/\Gamma $$

<table><thead><tr><th>VALUE (units 10<sup>-4</sup>)</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead></table>

1.34±0.18 OUR FIT Error includes scale factor of 1.5.

1.34±0.19 OUR AVERAGE Error includes scale factor of 1.5. See the ideogram below.

<table><tr><td>1.41±0.09</td><td>±0.15</td><td>ARNALDI</td><td>16</td><td>NA60</td><td>400 GeV (p-A) collisions</td></tr><tr><td>1.72±0.25</td><td>±0.14</td><td>3k</td><td>09</td><td>NA60</td><td>158A In-In collisions</td></tr><tr><td>0.96±0.23</td><td></td><td>DZHELYADIN</td><td>81B</td><td>CNTR</td><td>25-33 π<sup>-</sup> p → ωn</td></tr></table>

WEIGHTED AVERAGE
1.34±0.19 (Error scaled by 1.5)

<figure><img src="image_444.png" /></figure>

Values above of weighted average, error, and scale factor are based upon the data in this ideogram only. They are not necessarily the same as our 'best' values, obtained from a least-squares constrained fit utilizing measurements of other (related) quantities as additional information.

$$ \Gamma(\eta e^+ e^-)/\Gamma_{\text{total}} \qquad \Gamma_8/\Gamma $$

<table><thead><tr><th>VALUE (units 10<sup>-5</sup>)</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>&lt;1.1</td><td></td><td>AKHMETSHIN 05A</td><td>CMD2</td><td>0.72-0.84 e<sup>+</sup> e<sup>-</sup></td></tr></table>
$$ \Gamma(e^+ e^-)/\Gamma_{\text{total}} \qquad \Gamma_9/\Gamma $$

<table><thead><tr><th>VALUE (units 10<sup>-4</sup>)</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td colspan="5">0.738&plusmn;0.022 OUR FIT</td></tr></tbody></table>

Error includes scale factor of 1.9.

<table><tbody><tr><td>0.700&plusmn;0.016</td><td>11200</td><td>1,2 AKHMETSHIN 04</td><td>CMD2</td><td>e<sup>+</sup>e<sup>-</sup> &rarr; &pi;<sup>+</sup>&pi;<sup>-</sup>&pi;<sup>0</sup></td></tr><tr><td>0.752&plusmn;0.004&plusmn;0.024</td><td>1.2M</td><td>2,3 ACHASOV</td><td>03d</td><td>RVUE</td></tr><tr><td>0.714&plusmn;0.036</td><td></td><td>2 DOLINSKY</td><td>89</td><td>ND</td></tr><tr><td>0.72&plusmn;0.03</td><td></td><td>2 BARKOV</td><td>87</td><td>CMD</td></tr><tr><td>0.64&plusmn;0.04</td><td>1488</td><td>2 KURDADZE</td><td>83b</td><td>OLYA</td></tr><tr><td>0.675&plusmn;0.069</td><td>433</td><td>2 CORDIER</td><td>80</td><td>DM1</td></tr><tr><td>0.83&plusmn;0.10</td><td>451</td><td>2 BENAKSAS</td><td>72b</td><td>OSPK</td></tr><tr><td>0.77&plusmn;0.06</td><td></td><td>4 AUGUSTIN</td><td>69d</td><td>OSPK</td></tr><tr><td>0.65&plusmn;0.13</td><td>33</td><td>5 ASTVACAT...</td><td>68</td><td>OSPK</td></tr></tbody></table>

¹Using B($\omega \rightarrow \pi^{+}\pi^{-}\pi^{0}$) = 0.891 &plusmn; 0.007. Update of AKHMETSHIN 00c.

²Not independent of the corresponding $\Gamma(e^{+}e^{-}) \times \Gamma(\pi^{+}\pi^{-}\pi^{0})/\Gamma_{\text{total}}^{2}$.

³Using ACHASOV 03, ACHASOV 03D and B($\omega \rightarrow \pi^{+}\pi^{-}$) = (1.70 &plusmn; 0.28)%.

⁴Rescaled by us to correspond to $\omega$ width 8.4 MeV. Systematic errors underestimated.

⁵Not resolved from $\rho$ decay. Error statistical only.

$$ \Gamma(\pi^{+}\pi^{-}\pi^{0}\pi^{0})/\Gamma_{\text{total}} \qquad \Gamma_{10}/\Gamma $$

<table><thead><tr><th>VALUE (units 10<sup>-4</sup>)</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;2</td><td>90</td><td>ACHASOV</td><td>09A</td><td>SND</td></tr></tbody></table>

Error is due to the following data for averages, fits, limits, etc. • • •

<table><tbody><tr><td>&lt;200</td><td>90</td><td>KURDADZE</td><td>86</td><td>OLYA</td></tr></tbody></table>

$$ \Gamma(\pi^{+}\pi^{-}\gamma)/\Gamma_{\text{total}} \qquad \Gamma_{11}/\Gamma $$

<table><thead><tr><th>VALUE</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;0.0036</td><td>95</td><td>WEIDENAUER 90</td><td>ASTE</td><td>p p&#773; &rarr; &pi;<sup>+</sup>&pi;<sup>-</sup>&pi;<sup>+</sup>&pi;<sup>-</sup>&gamma;</td></tr></tbody></table>

Error is due to the following data for averages, fits, limits, etc. • • •

<table><tbody><tr><td>&lt;0.004</td><td>95</td><td>BITYUKOV</td><td>88b</td><td>SPEC</td></tr></tbody></table>

$$ \Gamma(\pi^{+}\pi^{-}\gamma)/\Gamma(\pi^{+}\pi^{-}\pi^{0}) \qquad \Gamma_{11}/\Gamma_1 $$

<table><thead><tr><th>VALUE</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;0.066</td><td>90</td><td>KALBFLEISCH 75</td><td>HBC</td><td>2.18 K<sup>+</sup>p &rarr; &Lambda;<sup>+</sup>&pi;<sup>-</sup>&gamma;</td></tr><tr><td>&lt;0.05</td><td>90</td><td>FLATTE</td><td>66</td><td>HBC</td></tr></tbody></table>

<table><tbody><tr><td>&lt;0.066</td><td>90</td><td>KALBFLEISCH 75</td><td>HBC</td><td>2.18 K<sup>+</sup>p &rarr; &Lambda;<sup>+</sup>&pi;<sup>-</sup>&gamma;</td></tr><tr><td>&lt;0.05</td><td>90</td><td>FLATTE</td><td>66</td><td>HBC</td></tr></tbody></table>

$$ \Gamma(\pi^{+}\pi^{-}\pi^{0}\pi^{0})/\Gamma_{\text{total}} \qquad \Gamma_{12}/\Gamma $$

<table><thead><tr><th>VALUE</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;1 &times; 10<sup>-3</sup></td><td>90</td><td>KURDADZE</td><td>88</td><td>OLYA</td></tr></tbody></table>

$$ \Gamma(\pi^{0}\pi^{0}\gamma)/\Gamma_{\text{total}} \qquad \Gamma_{13}/\Gamma $$

<table><thead><tr><th>VALUE (units 10<sup>-5</sup>)</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td colspan="5">6.7&plusmn;1.1 OUR FIT</td></tr><tr><td colspan="5">6.5&plusmn;1.2 OUR AVERAGE</td></tr></tbody></table>

<table><tbody><tr><td>6.4<sup>+2.4</sup><sub>-2.0</sub>&plusmn;0.8</td><td>190</td><td>1 AKHMETSHIN 04B</td><td>CMD2</td><td>0.6-0.97 e<sup>+</sup>e<sup>-</sup> &rarr; &pi;<sup>0</sup>&pi;<sup>0</sup>&gamma;</td></tr><tr><td>6.6<sup>+1.4</sup><sub>-1.3</sub>&plusmn;0.6</td><td>295</td><td>ACHASOV</td><td>02F</td><td>SND</td></tr></tbody></table>

Error is due to the following data for averages, fits, limits, etc. • • •

<table><tbody><tr><td>11.8<sup>+2.1</sup><sub>-1.9</sub>&plusmn;1.4</td><td>190</td><td>2 AKHMETSHIN 04B</td><td>CMD2</td><td>0.6-0.97 e<sup>+</sup>e<sup>-</sup> &rarr; &pi;<sup>0</sup>&pi;<sup>0</sup>&gamma;</td></tr><tr><td>7.8&plusmn;2.7&plusmn;2.0</td><td>63</td><td>1,3 ACHASOV</td><td>00G</td><td>SND</td></tr><tr><td>12.7&plusmn;2.3&plusmn;2.5</td><td>63</td><td>2,3 ACHASOV</td><td>00G</td><td>SND</td></tr></tbody></table>

¹In the model assuming the $\rho \rightarrow \pi^0\pi^0\gamma$ decay via the $\omega\pi$ and $f_0(500)\gamma$ mechanisms.

²In the model assuming the $\rho \rightarrow \pi^0\pi^0\gamma$ decay via the $\omega\pi$ mechanism only.

³Superseded by ACHASOV 02F.

$$ \Gamma(\pi^{0}\pi^{0}\gamma)/\Gamma(\pi^{+}\pi^{-}\pi^{0}) \qquad \Gamma_{13}/\Gamma_1 $$

<table><thead><tr><th>VALUE</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;0.00045</td><td>90</td><td>DOLINSKY</td><td>89</td><td>ND</td></tr></tbody></table>

Error is due to the following data for averages, fits, limits, etc. • • •

<table><tbody><tr><td>&lt;0.08</td><td>95</td><td>JACQUET</td><td>69b</td><td>HLBC</td></tr></tbody></table>

$$ \Gamma(\pi^{0}\pi^{0}\gamma)/\Gamma(\pi^{0}\gamma) \qquad \Gamma_{13}/\Gamma_2 $$

<table><thead><tr><th>VALUE (units 10<sup>-4</sup>)</th><th>CL%</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td colspan="6">8.0&plusmn;1.3 OUR FIT</td></tr><tr><td>8.5&plusmn;2.9</td><td>40 &plusmn; 14</td><td>ALDE</td><td>94b</td><td>GAM2</td><td>38&pi;<sup>+</sup>p &rarr; &pi;<sup>0</sup>&pi;<sup>0</sup>&gamma;n</td></tr></tbody></table>

Error is due to the following data for averages, fits, limits, etc. • • •

<table><tbody><tr><td>&lt;50</td><td>90</td><td>DOLINSKY</td><td>89</td><td>ND</td></tr><tr><td>&lt;1800</td><td>95</td><td>KEYNE</td><td>76</td><td>CNTR</td></tr><tr><td>&lt;1500</td><td>90</td><td>BENAKSAS</td><td>72c</td><td>OSPK</td></tr><tr><td>&lt;1400</td><td>90</td><td>BALDIN</td><td>71</td><td>HLBC</td></tr><tr><td>&lt;1000</td><td>90</td><td>BARMIN</td><td>64</td><td>HLBC</td></tr></tbody></table>

$$ \Gamma(\pi^{0}\pi^{0}\gamma)/\Gamma(\text{neutrals}) \qquad \Gamma_{13}/(\Gamma_{2}+\Gamma_{4}) $$

<table><thead><tr><th>VALUE</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>0.22&plusmn;0.07</td><td>1 DAKIN</td><td>72</td><td>OSPK</td><td>1.4&pi;<sup>+</sup>p &rarr; nMM</td></tr><tr><td>&lt;0.19</td><td>90</td><td>DEINET</td><td>69b</td><td>OSPK</td></tr></tbody></table>

Error is due to the following data for averages, fits, limits, etc. • • •

<table><tbody><tr><td>0.22&plusmn;0.07</td><td>1 DAKIN</td><td>72</td><td>OSPK</td><td>1.4&pi;<sup>+</sup>p &rarr; nMM</td></tr><tr><td>&lt;0.19</td><td>90</td><td>DEINET</td><td>69b</td><td>OSPK</td></tr></tbody></table>

¹See $\Gamma(\pi^0\gamma)/\Gamma(\text{neutrals})$.

$$ \Gamma(\eta\pi^0\gamma)/\Gamma_{\text{total}} \qquad \Gamma_{14}/\Gamma $$

<table><thead><tr><th>VALUE (units 10<sup>-5</sup>)</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;3.3</td><td>90</td><td>AKHMETSHIN 04B</td><td>CMD2</td><td>0.6-0.97 e<sup>+</sup>e<sup>-</sup> &rarr; &eta;<sup>0</sup>&pi;<sup>-</sup>&gamma;</td></tr></tbody></table>

$$ \Gamma(\mu^{+}\mu^{-})/\Gamma_{\text{total}} \qquad \Gamma_{15}/\Gamma $$

<table><thead><tr><th>VALUE (units 10<sup>-5</sup>)</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td colspan="5">7.4&plusmn;1.8 OUR FIT</td></tr><tr><td colspan="5">7.4&plusmn;1.8 OUR AVERAGE</td></tr></tbody></table>

<table><tbody><tr><td>6.6&plusmn;1.4&plusmn;1.7</td><td>4.5M</td><td>1 ANASTASI</td><td>17</td><td>KLOE</td></tr><tr><td>9.0&plusmn;2.9&plusmn;1.1</td><td>18</td><td>HEISTER</td><td>02c</td><td>ALEC</td></tr></tbody></table>

¹Assuming lepton universality in the decay $\omega \rightarrow \ell^{+}\ell^{-}$ and correcting for different phase space between electron and muon final states.

$$ \Gamma(\mu^{+}\mu^{-})/\Gamma(\pi^{+}\pi^{-}\pi^{0}) \qquad \Gamma_{15}/\Gamma_1 $$

<table><thead><tr><th>VALUE (units 10<sup>-3</sup>)</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;0.2</td><td>90</td><td>WILSON</td><td>69</td><td>OSPK</td></tr></tbody></table>

Error is due to the following data for averages, fits, limits, etc. • • •

<table><tbody><tr><td>&lt;1.7</td><td>74</td><td>FLATTE</td><td>66</td><td>HBC</td></tr><tr><td>&lt;1.2</td><td></td><td>BARBARO...</td><td>65</td><td>HBC</td></tr></tbody></table>

$$ \Gamma(\pi^{0}\mu^{+}\mu^{-})/\Gamma(\mu^{+}\mu^{-}) \qquad \Gamma_{7}/\Gamma_{15} $$

<table><thead><tr><th>VALUE</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>1.2&plusmn;0.6</td><td>30</td><td>1 DZHELYADIN</td><td>79</td><td>CNTR</td></tr></tbody></table>

¹Superseded by DZHELYADIN 81B result above.

$$ \Gamma(\gamma\beta)/\Gamma_{\text{total}} \qquad \Gamma_{16}/\Gamma $$

<table><thead><tr><th>VALUE (units 10<sup>-4</sup>)</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;1.9</td><td>95</td><td>1 ABELE</td><td>97E</td><td>CBAR</td></tr></tbody></table>

Error is due to the following data for averages, fits, limits, etc. • • •

<table><tbody><tr><td>&lt;2</td><td>90</td><td>1 PROKOSHKIN</td><td>95</td><td>GAM2</td></tr></tbody></table>

¹From direct $3\gamma$ decay search.

$$ \Gamma(\eta\pi^0)/\Gamma_{\text{total}} \qquad \Gamma_{17}/\Gamma $$

<table><thead><tr><th>VALUE</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;0.001</td><td>90</td><td>ALDE</td><td>94b</td><td>GAM2</td></tr></tbody></table>

Error is due to the following data for averages, fits, limits, etc. • • •

<table><tbody><tr><td>&lt;0.001</td><td>90</td><td>ALDE</td><td>94b</td><td>GAM2</td></tr></tbody></table>

$$ \Gamma(\eta\pi^{0})/\Gamma(\pi^{+}\pi^{-}\pi^{0}) \qquad (\Gamma_{5}+\Gamma_{17})/\Gamma_{1} $$

<table><thead><tr><th>VALUE</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;0.016</td><td>90</td><td>1 FLATTE</td><td>66</td><td>HBC</td></tr></tbody></table>

Error is due to the following data for averages, fits, limits, etc. • • •

<table><tbody><tr><td>&lt;0.045</td><td>95</td><td>JACQUET</td><td>69b</td><td>HLBC</td></tr></tbody></table>

¹Restated by us using $B(\eta \rightarrow \text{charged modes}) = 29.2\%$.

$$ \Gamma(\eta\pi^0)/\Gamma(\pi^0\gamma) \qquad \Gamma_{17}/\Gamma_2 $$

<table><thead><tr><th>VALUE (units 10<sup>-3</sup>)</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;2.6</td><td>90</td><td>1 STAROSTIN</td><td>09</td><td>CRYM</td></tr></tbody></table>

¹STAROSTIN 09 reports $[\Gamma(\omega(782) \rightarrow \eta\pi^0)/\Gamma(\omega(782) \rightarrow \pi^0\gamma)] \times [B(\eta \rightarrow 2\gamma)] < 1.01 \times 10^{-3}$ which we divide by our best value $B(\eta \rightarrow 2\gamma) = 39.36 \times 10^{-2}$.

$$ \Gamma(2\pi^0)/\Gamma(\pi^0\gamma) \qquad \Gamma_{18}/\Gamma_2 $$

<table><thead><tr><th>VALUE (units 10<sup>-3</sup>)</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;2.59</td><td>90</td><td>STAROSTIN</td><td>09</td><td>CRYM</td></tr></tbody></table>

$$ \Gamma(3\pi^0)/\Gamma_{\text{total}} \qquad \Gamma_{19}/\Gamma $$

<table><thead><tr><th>VALUE</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;2.72</td><td>90</td><td>STAROSTIN</td><td>09</td><td>CRYM</td></tr></tbody></table>

Error is due to the following data for averages, fits, limits, etc. • • •

<table><tbody><tr><td>&lt;3 &times; 10<sup>-4</sup></td><td>90</td><td>PROKOSHKIN</td><td>95</td><td>GAM2</td></tr></tbody></table>

$$ \Gamma(3\pi^0)/\Gamma(\pi^0\gamma) \qquad \Gamma_{19}/\Gamma_2 $$

<table><thead><tr><th>VALUE (units 10<sup>-3</sup>)</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;2.72</td><td>90</td><td>STAROSTIN</td><td>09</td><td>CRYM</td></tr></tbody></table>

$$ \Gamma(3\pi^0)/\Gamma(\pi^{+}\pi^{-}\pi^{0}) \qquad \Gamma_{19}/\Gamma_1 $$

<table><thead><tr><th>VALUE</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;0.009</td><td>90</td><td>BARBERIS</td><td>01</td><td>450 p p&#773; &rarr; p<sub>f</sub> 3&pi;<sup>0</sup>p<sub>s</sub></td></tr></tbody></table>

Error is due to the following data for averages, fits, limits, etc. • • •

<table><tbody><tr><td>&lt;0.009</td><td>90</td><td>BARBERIS</td><td>01</td><td>450 p p&#773; &rarr; p<sub>f</sub> 3&pi;<sup>0</sup>p<sub>s</sub></td></tr></tbody></table>

$$ \Gamma(\text{invisible})/\Gamma(\pi^{+}\pi^{-}\pi^{0}) \qquad \Gamma_{20}/\Gamma_1 $$

<table><thead><tr><th>VALUE</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;8.1 &times; 10<sup>-5</sup></td><td>90</td><td>ABLIKIM</td><td>18s</td><td>BES3</td></tr></tbody></table>

<table><tbody><tr><td>&lt;8.1 &times; 10<sup>-5</sup></td><td>90</td><td>ABLIKIM</td><td>18s</td><td>BES3</td></tr></tbody></table>
## PARAMETER $\Lambda$ IN $\omega \to \pi^0 \ell^+ \ell^-$ DECAY

In the pole approximation the electromagnetic transition form factor for a resonance of mass $M$ is given by the expression:

$$|\Pi|^2 = (1 - M^2/\Lambda^2)^2,$$

where for the parameter $\Lambda$ vector dominance predicts $\Lambda = M_p \approx 0.770$ GeV. The ARNALDI 09 measurement is in obvious conflict with this expectation. Note that for $\eta \to \gamma\mu^+\mu^-$ decay ARNALDI 09 and DZHELYADIN 80 obtain the value of $\Lambda$ consistent with vector dominance.

## PARAMETER $\Lambda$ IN $\omega \to \pi^0 \mu^+ \mu^-$ DECAY

<table><thead><tr><th>VALUE (GeV)</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td><strong>0.670 ±0.006</strong></td><td><strong>OUR AVERAGE</strong></td><td></td><td></td><td></td></tr><tr><td>0.6707 ±0.0039 ±0.0056</td><td>1 ARNALDI</td><td>16</td><td>NA60</td><td>400 GeV ($p-\Lambda$) collisions</td></tr><tr><td>0.668 ±0.009 ±0.003</td><td>3k</td><td>2 ARNALDI</td><td>09</td><td>NA60 158A In–In collisions</td></tr></tbody></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>0.65 ±0.03</td><td>DZHELYADIN</td><td>81B</td><td>CNTR</td><td>25–33 $\pi^-$ $p \to \omega n$</td></tr></table>

¹ ARNALDI 16 reports $\Lambda^2(\omega) = 2.223 \pm 0.026 \pm 0.037$ GeV$^{-2}$ which we converted to the quoted $\Lambda$ value.

² ARNALDI 09 reports $\Lambda^2(\omega) = 2.24 \pm 0.06 \pm 0.02$ GeV$^{-2}$ which we converted to the quoted $\Lambda$ value.

## PARAMETER $\Lambda$ IN $\omega \to \pi^0 e^+ e^-$ DECAY

<table><thead><tr><th>VALUE (GeV)</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td><strong>0.709 ±0.037</strong></td><td><strong>1.1k</strong></td><td><strong>1 ADLARSON</strong></td><td><strong>17b</strong></td><td><strong>A2MM $\gamma p \to \omega p$</strong></td></tr></tbody></table>

¹ ADLARSON 17b reports $\Lambda^2(\omega^0) = 1.99 \pm 0.21$ GeV$^{-2}$ that we converted to the quoted $\Lambda$ value.

## ENERGY DEPENDENCE OF $\omega \to \pi^+ \pi^- \pi^0$ DALITZ PLOT

The following experiments fit to one or more of the coefficients $\alpha, \beta, \gamma$ for $|\text{matrix element}|^2 \propto P(1 + 2\alpha Z + 2\beta Z^3/2) \sin(3\phi) + 2\gamma Z^2 + O(Z^5/2))$ where $P$ is the $P$-wave phase-space factor and $Z, \phi$ are kinematical variables as defined in ADLARSON 17.

<table><thead><tr><th>VALUE</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td><strong>0.133 ±0.008</strong></td><td><strong>OUR AVERAGE</strong></td><td></td><td></td><td></td></tr><tr><td>0.1321 ±0.0067 ±0.0046</td><td>260k</td><td>1 ABLIKIM</td><td>18AD</td><td>BES3 $J/\psi \to \omega \eta$</td></tr><tr><td>0.147 ±0.036</td><td>44k</td><td>ADLARSON</td><td>17</td><td>WASA $\alpha$ in $p d \to ^3\text{He} \omega$, $p p \to p p \omega$</td></tr></tbody></table>

¹ Keeping a term linear in $Z$ only. A fit with the terms proportional to $Z$ and $Z^3/2$ gives $\alpha = 0.133 \pm 0.041$ and $\beta = 0.037 \pm 0.054$.

## $\omega(782)$ REFERENCES

<table><tbody><tr><td>ACHASOV</td><td>21</td><td>JHEP</td><td>2101</td><td>113</td><td>M.N. Achasov et al.</td><td>(SND Collab.)</td></tr><tr><td>LEES</td><td>21B</td><td>PR</td><td>D104</td><td>112003</td><td>J.P. Lees et al.</td><td>(BABAR Collab.)</td></tr><tr><td>ANDREEV</td><td>20</td><td>EPJ</td><td>C80</td><td>1189</td><td>V. Andreev et al.</td><td>(H1 Collab.)</td></tr><tr><td>HOID</td><td>20</td><td>EPJ</td><td>C80</td><td>988</td><td>B.-L. Hoid, M. Hoferichter, K. Kubis</td><td>(BONN, BERN)</td></tr><tr><td>COLANGELO</td><td>19</td><td>JHEP</td><td>1902</td><td>006</td><td>G. Colangelo, M. Hoferichter, P. Stoffer</td><td>(BERN+)</td></tr><tr><td>HOFERICHT...</td><td>19</td><td>JHEP</td><td>1908</td><td>137</td><td>M. Hoferichter, B.-L. Hoid, K. Kubis</td><td>(WASH, BONN)</td></tr><tr><td>ABLIKIM</td><td>18AD</td><td>PR</td><td>D98</td><td>112000</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>18C</td><td>PR</td><td>120</td><td>242003</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>18S</td><td>PR</td><td>D98</td><td>032001</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>HANHART</td><td>18</td><td>EPJ</td><td>C75</td><td>450</td><td>C. Harbant et al.</td><td>(WASA-at-COSY Collab.)</td></tr><tr><td>ADLARSON</td><td>17B</td><td>JP</td><td>B770</td><td>418</td><td>P. Adlarson et al.</td><td>(A2 Collab. at MAMI)</td></tr><tr><td>ADLARSON</td><td>17B</td><td>PR</td><td>C95</td><td>035208</td><td>P. Adlarson et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ANASTASI</td><td>17B</td><td>JP</td><td>B767</td><td>485</td><td>A. Anastasi et al.</td><td>(KLOE-2 Collab.)</td></tr><tr><td>ABLIKIM</td><td>16B</td><td>JP</td><td>B753</td><td>103</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ACHASOV</td><td>16A</td><td>PR</td><td>D93</td><td>092001</td><td>M.N. Achasov et al.</td><td>(SND Collab.)</td></tr><tr><td>ARNALDI</td><td>15</td><td>JP</td><td>C65</td><td>211</td><td>R. Akhmetshin et al.</td><td>(NA60 Collab.)</td></tr><tr><td>PDG</td><td>16</td><td>CP</td><td>C40</td><td>100001</td><td>C. Patrignani et al.</td><td>(PDG Collab.)</td></tr><tr><td>PDG</td><td>15</td><td>RPP</td><td>2015</td><td>at pdg.ibl.gov</td><td></td><td>(PDG Collab.)</td></tr><tr><td>ACHASOV</td><td>13</td><td>PR</td><td>D88</td><td>054013</td><td>M.N. Achasov et al.</td><td>(SND Collab.)</td></tr><tr><td>BABUSCI</td><td>13D</td><td>PL</td><td>B720</td><td>336</td><td>D. Babusci et al.</td><td>(CATA, CALB, BARI)</td></tr><tr><td>BENAYOYN</td><td>13</td><td>EPJ</td><td>C73</td><td>2453</td><td>M. Benayoun, P. David, L. DelBuono</td><td>(PARIN, BERLIN+)</td></tr><tr><td>DAVIER</td><td>13</td><td>EPJ</td><td>C73</td><td>2597</td><td>M. Davier et al.</td><td>(BABAR Collab.)</td></tr><tr><td>LEES</td><td>12</td><td>JP</td><td>B77</td><td>102</td><td>J.P. Lees et al.</td><td>(BONN)</td></tr><tr><td>NIECKNIG</td><td>12</td><td>EPJ</td><td>C72</td><td>2014</td><td>F. Niecknig, B. Kubis, S.P. Schneider</td><td>(BONN)</td></tr><tr><td>AMBROSINO</td><td>11A</td><td>JP</td><td>B700</td><td>102</td><td>F. Ambrosino et al.</td><td>(BABAR Collab.)</td></tr><tr><td>BENAYOYN</td><td>10</td><td>EPJ</td><td>C65</td><td>211</td><td>A. Starostin et al.</td><td>(Crystal Ball Collab. at MAMI)</td></tr><tr><td>ACHASOV</td><td>09A</td><td>JP</td><td>C79</td><td>109</td><td>M.N. Achasov et al.</td><td>(SND Collab.)</td></tr><tr><td>ARNALDI</td><td>09</td><td>PL</td><td>B677</td><td>260</td><td>R. Arnaldi et al.</td><td>(NA60 Collab.)</td></tr><tr><td>AUBERT</td><td>09AS</td><td>PR</td><td>103</td><td>231801</td><td>B. Aubert et al.</td><td>(BABAR Collab.)</td></tr><tr><td>STAROSTIN</td><td>09</td><td>JP</td><td>C65</td><td>05201</td><td>A. Starostin et al.</td><td>(Crystal Ball Collab. at MAMI)</td></tr><tr><td>ACHASOV</td><td>08</td><td>JP</td><td>C75</td><td>107</td><td>M.N. Achasov et al.</td><td>(SND Collab.)</td></tr><tr><td>AMBROSINO</td><td>08G</td><td>PL</td><td>B669</td><td>223</td><td>F. Ambrosino et al.</td><td>(KLOE Collab.)</td></tr><tr><td>ACHASOV</td><td>08B</td><td>PL</td><td>B677</td><td>07710</td><td>M.N. Achasov et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>AKHMETSHIN</td><td>07</td><td>PL</td><td>B648</td><td>29</td><td>R.R. Akhmetshin et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>ACHASOV</td><td>06</td><td>JP</td><td>C75</td><td>103</td><td>M.N. Achasov et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>ACHASOV</td><td>06A</td><td>PR</td><td>D74</td><td>041016</td><td>M.N. Achasov et al.</td><td>(SND Collab.)</td></tr><tr><td>AULCHENKO</td><td>06A</td><td>JETPL</td><td>C8</td><td>413</td><td>A. Aulchchenko et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>ACHASOV</td><td>05A</td><td>JETP</td><td>101</td><td>1053</td><td>M.N. Achasov et al.</td><td>(Novosibirsk SND Collab.)</td></tr><tr><td>AKHMETSHIN</td><td>05</td><td>JP</td><td>C75</td><td>103</td><td>Translated from ZETF 130 437.</td><td>(SND Collab.)</td></tr><tr><td>AKHMETSHIN</td><td>05A</td><td>PL</td><td>B605</td><td>26</td><td>R.R. Akhmetshin et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>AKHMETSHIN</td><td>05A</td><td>PL</td><td>B613</td><td>29</td><td>R.R. Akhmetshin et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>AULCHENKO</td><td>05</td><td>JETPL</td><td>B2</td><td>84</td><td>V.M. Aulchchenk et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>AKHMETSHIN</td><td>04</td><td>PL</td><td>B578</td><td>285</td><td>R.R. Akhmetshin et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>AKHMETSHIN</td><td>04B</td><td>PL</td><td>B580</td><td>119</td><td>R.R. Akhmetshin et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>AUBERT, B</td><td>04N</td><td>PR</td><td>D70</td><td>072004</td><td>B. Aubert et al.</td><td>(BABAR Collab.)</td></tr><tr><td>PDG</td><td>02</td><td>PL</td><td>B59</td><td>1</td><td>S. Eidelman et al.</td><td>(PDG Collab.)</td></tr><tr><td>ACHASOV</td><td>03</td><td>PL</td><td>B559</td><td>171</td><td>M.N. Achasov et al.</td><td>(Novosibirsk SND Collab.)</td></tr><tr><td>ACHASOV</td><td>03D</td><td>PR</td><td>D68</td><td>052006</td><td>M.N. Achasov et al.</td><td>(Novosibirsk SND Collab.)</td></tr><tr><td>ALOISIO</td><td>03</td><td>PL</td><td>B651</td><td>55</td><td>A. Aloisio et al.</td><td>(KLOE Collab.)</td></tr><tr><td>BENAYOYN</td><td>03</td><td>EPJ</td><td>C29</td><td>397</td><td>M. Benayoun et al.</td><td>(BONN)</td></tr><tr><td>ACHASOV</td><td>02E</td><td>PR</td><td>D66</td><td>032001</td><td>M.N. Achasov et al.</td><td>(Novosibirsk SND Collab.)</td></tr><tr><td>ACHASOV</td><td>02F</td><td>PL</td><td>B537</td><td>201</td><td>M.N. Achasov et al.</td><td>(Novosibirsk SND Collab.)</td></tr><tr><td>AKHMETSHIN</td><td>02</td><td>PL</td><td>B527</td><td>161</td><td>R.R. Akhmetshin et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>ALOISIO</td><td>02D</td><td>PL</td><td>B521</td><td>21</td><td>A. Aloisio et al.</td><td>(KLOE Collab.)</td></tr><tr><td>HEISTER</td><td>02C</td><td>PL</td><td>B528</td><td>19</td><td>A. Heister et al.</td><td>(ALEPH Collab.)</td></tr></tbody></table>

<table><tbody><tr><td>ACHASOV</td><td>01B</td><td>PR</td><td>D63</td><td>072002</td><td>M.N. Achasov et al.</td><td>(Novosibirsk SND Collab.)</td></tr><tr><td>AKHMETSHIN</td><td>01E</td><td>PL</td><td>B509</td><td>217</td><td>R.R. Akhmetshin et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>BARBERIS</td><td>01</td><td>PL</td><td>B507</td><td>14</td><td>D. Barberis et al.</td><td>(Novosibirsk SND Collab.)</td></tr><tr><td>ACHASOV</td><td>00</td><td>EPJ</td><td>C12</td><td>25</td><td>M.N. Achasov et al.</td><td>(Novosibirsk SND Collab.)</td></tr><tr><td>ACHASOV</td><td>00D</td><td>JETPL</td><td>72</td><td>282</td><td>M.N. Achasov et al.</td><td>(Novosibirsk SND Collab.)</td></tr><tr><td>ACHASOV</td><td>00G</td><td>Translated from</td><td>ZETF</td><td>72</td><td>M.N. Achasov et al.</td><td>(Novosibirsk SND Collab.)</td></tr><tr><td>AKHMETSHIN</td><td>00C</td><td>Translated from</td><td>ZETF</td><td>71</td><td>519</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>AULCHENKO</td><td>00A</td><td>PL</td><td>B476</td><td>33</td><td>R.R. Akhmetshin et al.</td><td>(Novosibirsk CMD-2 Collab.)</td></tr><tr><td>ACHASOV</td><td>00C</td><td>Translated from</td><td>ZETF</td><td>117</td><td>1067.</td><td>(Novosibirsk SND Collab.)</td></tr><tr><td>ACHASOV</td><td>00</td><td>PR</td><td>D61</td><td>032002</td><td>T. Case et al.</td><td>(Crystal Barrel Collab.)</td></tr><tr><td>ACHASOV</td><td>00E</td><td>PL</td><td>B462</td><td>365</td><td>M.N. Achasov et al.</td><td>(Novosibirsk SND Collab.)</td></tr><tr><td>GARDNER</td><td>99</td><td>PR</td><td>D59</td><td>076002</td><td>S. Gardner, H.B. O'Connell</td><td>(IPNP, NOVO, ADLDP+)</td></tr><tr><td>BENAYOYN</td><td>98</td><td>EPJ</td><td>C2</td><td>269</td><td>M. Benayoun et al.</td><td>(Crystal Barrel Collab.)</td></tr><tr><td>ABELO</td><td>97E</td><td>PL</td><td>C11</td><td>361</td><td>A. Ablak et al.</td><td>(IPNP, NOVO)</td></tr><tr><td>BENAYOYN</td><td>96</td><td>ZPHY</td><td>C72</td><td>221</td><td>M. Benayoun et al.</td><td>(IPNP, NOVO)</td></tr><tr><td>PROKOSHKIN</td><td>95</td><td>PD</td><td>40</td><td>273</td><td>Y.D. Prokoshkin, V.D. Samoilenko</td><td>(SERP)</td></tr><tr><td>WURZINGER</td><td>95</td><td>PR</td><td>C51</td><td>443</td><td>R. Wurzinger et al.</td><td>(BONN, ORSAY, SACL+)</td></tr><tr><td>ALDE</td><td>94B</td><td>PL</td><td>B340</td><td>122</td><td>D.M. Alde et al.</td><td>(SERP, BELG, LANL, LAPP+)</td></tr><tr><td>AMSLER</td><td>94C</td><td>PL</td><td>B327</td><td>425</td><td>C. Amsler et al.</td><td>(Crystal Barrel Collab.)</td></tr><tr><td>ALDE</td><td>93</td><td>PAW</td><td>56</td><td>1229</td><td>D.M. Alde et al.</td><td>(SERP, LAPP, LANL, BELG+)</td></tr><tr><td>Also</td><td></td><td>Translated from</td><td>YAF</td><td>56</td><td>D.M. Alde et al.</td><td>(SERP, LAPP, LANL, BELG+)</td></tr><tr><td>AMSLER</td><td>93B</td><td>PL</td><td>B311</td><td>35</td><td>C. Amsler et al.</td><td>(Crystal Barrel Collab.)</td></tr><tr><td>WEIDENAUER</td><td>93</td><td>ZPHY</td><td>C59</td><td>387</td><td>P. Weidenauer et al.</td><td>(ASTERIX Collab.)</td></tr><tr><td>ANTONELLI</td><td>92</td><td>ZPHY</td><td>C56</td><td>15</td><td>A. Antonelli et al.</td><td>(DM2 Collab.)</td></tr><tr><td>DOLINSKY</td><td>91</td><td>PRPL</td><td>202</td><td>99</td><td>S.I. Dolinsky et al.</td><td>(NOVO)</td></tr><tr><td>WEIDENAUER</td><td>90</td><td>ZPHY</td><td>C73</td><td>353</td><td>P. Weidenauer et al.</td><td>(ASTERIX Collab.)</td></tr><tr><td>DOLINSKY</td><td>89</td><td>ZPHY</td><td>C42</td><td>511</td><td>S.I. Dolinsky et al.</td><td>(NOVO)</td></tr><tr><td>BITYUKOV</td><td>88B</td><td>SJNP</td><td>47</td><td>800</td><td>S.I. Bityukov et al.</td><td>(SERP)</td></tr><tr><td>DOLINSKY</td><td>88</td><td>JP</td><td>C61</td><td>277</td><td>S.I. Dolinsky et al.</td><td>(NOVO)</td></tr><tr><td>KURDADZE</td><td>88</td><td>Translated from</td><td>YAF</td><td>48</td><td>L.M. Kurdadze et al.</td><td>(NOVO)</td></tr><tr><td>JETPL</td><td>74</td><td>JP</td><td>C41</td><td>52</td><td>JETPL 47 512</td><td>(NOVO)</td></tr><tr><td>AULCHENKO</td><td>87</td><td>Translated from</td><td>ZETF</td><td>47</td><td>JETPL 46 432</td><td>(NOVO)</td></tr><tr><td>BARKOV</td><td>87</td><td>JP</td><td>C64</td><td>164</td><td>V.M. Aulchchenko et al.</td><td>(NOVO)</td></tr><tr><td>KURDADZE</td><td>86</td><td>Translated from</td><td>ZETF</td><td>46</td><td>JETPL 43 643</td><td>(NOVO)</td></tr><tr><td>BARKOV</td><td>85</td><td>NP</td><td>B256</td><td>365</td><td>L.M. Barkov et al.</td><td>(NOVO)</td></tr><tr><td>DOLINSKY</td><td>84</td><td>NP</td><td>144</td><td>136</td><td>V.P. Druzhin et al.</td><td>(NOVO)</td></tr><tr><td>KURDADZE</td><td>83B</td><td>JP</td><td>36</td><td>274</td><td>A.M. Kurdadze et al.</td><td>(NOVO)</td></tr><tr><td>DZHELYADIN</td><td>81B</td><td>PL</td><td>102B</td><td>296</td><td>R.I. Dzhelayadin et al.</td><td>(SERP)</td></tr><tr><td>CORDIER</td><td>80</td><td>NP</td><td>B172</td><td>13</td><td>A. Cordier et al.</td><td>(LALO)</td></tr><tr><td>DZHELYADIN</td><td>80</td><td>PL</td><td>B948</td><td>54</td><td>R.I. Dzhelayadin et al.</td><td>(SERP)</td></tr><tr><td>ROOS</td><td>80</td><td>LNC</td><td>27</td><td>321</td><td>M. Roos, A. Pellinen</td><td>(HEL5)</td></tr><tr><td>BENAEIRI</td><td>79</td><td>NP</td><td>B32</td><td>268</td><td>P. Benkhlei et al.</td><td>(EPOL, CERN, CDEF+)</td></tr><tr><td>DZHELYADIN</td><td>79</td><td>JP</td><td>C84</td><td>143</td><td>R.I. Dzhelayadin et al.</td><td>(SERP)</td></tr><tr><td>COOPER</td><td>78B</td><td>NP</td><td>B146</td><td>1</td><td>A.M. Cooper et al.</td><td>(TATA, CERN, CDEF+)</td></tr><tr><td>QUENZER</td><td>78</td><td>PL</td><td>76B</td><td>512</td><td>A. Quenzer et al.</td><td>(LALO)</td></tr><tr><td>VANAPEL...</td><td>78</td><td>NP</td><td>B133</td><td>245</td><td>G.W. van Apeldoorn et al.</td><td>(ZEEM)</td></tr><tr><td>WICKLUND</td><td>78</td><td>PR</td><td>D17</td><td>1197</td><td>A.B. Wicklund et al.</td><td>(ANL)</td></tr><tr><td>ANDREWS</td><td>77</td><td>PR</td><td>38</td><td>198</td><td>D.E. Andrews et al.</td><td>(ROCH)</td></tr><tr><td>GESSAROLI</td><td>77</td><td>NP</td><td>B126</td><td>382</td><td>R. Gessaroli et al.</td><td>(BGN, FIRZ, GENO+)</td></tr><tr><td>KEYNE</td><td>76</td><td>PR</td><td>D14</td><td>28</td><td>J. Keyne et al.</td><td>(LOIC, SHMP)</td></tr><tr><td>Also</td><td></td><td>Translated from</td><td>YAF</td><td>13</td><td>D. Keyne et al.</td><td>(LOIC, SHMP)</td></tr><tr><td>KALBFLEISCH</td><td>75</td><td>PR</td><td>D8</td><td>2789</td><td>D. Balthasar et al.</td><td>(LOIC, SHMP)</td></tr><tr><td>AGULAR...</td><td>72</td><td>PR</td><td>D6</td><td>29</td><td>M. Aguilar-Benitez et al.</td><td>(BNL+)</td></tr><tr><td>APEL</td><td>72B</td><td>PL</td><td>41B</td><td>234</td><td>M. Aguilar-Benitez et al.</td><td>(BNL)</td></tr><tr><td>BAFILE</td><td>72B</td><td>PL</td><td>23</td><td>234</td><td>M. Basile et al.</td><td>(KARL, PISA)</td></tr><tr><td>BENAKSAS</td><td>72</td><td>PL</td><td>39B</td><td>289</td><td>D. Benaksas et al.</td><td>(ORSAY)</td></tr><tr><td>BENAKSAS</td><td>72B</td><td>PL</td><td>42B</td><td>507</td><td>D. Benaksas et al.</td><td>(ORSAY)</td></tr><tr><td>BENAKSAS</td><td>72C</td><td>PL</td><td>42B</td><td>511</td><td>D. Benaksas et al.</td><td>(ORSAY)</td></tr><tr><td>BORENSTEIN</td><td>72</td><td>PL</td><td>D5</td><td>1559</td><td>S.R. Borestein et al.</td><td>(BNL, MICH)</td></tr><tr><td>BROWN</td><td>72</td><td>PL</td><td>C28</td><td>117</td><td>R.M. Brown et al.</td><td>(ILL, ILLC)</td></tr><tr><td>DAKIN</td><td>72</td><td>PR</td><td>D6</td><td>2321</td><td>J.T. Dakin et al.</td><td>(PRIN)</td></tr><tr><td>RATCLIFF</td><td>72</td><td>PL</td><td>3B</td><td>345</td><td>B.N. Ratcliff et al.</td><td>(SLAC)</td></tr><tr><td>ALVENSLEB...</td><td>71C</td><td>PL</td><td>27</td><td>888</td><td>H. Alvensleben et al.</td><td>(DESY)</td></tr><tr><td>BALDIN</td><td>71</td><td>PR</td><td>13</td><td>758</td><td>A.B. Baldin et al.</td><td>(ITEF)</td></tr><tr><td>BEHREND</td><td>71</td><td>PR</td><td>27</td><td>61</td><td>J.H. Behrend et al.</td><td>(ROCH, CORN, FNAL)</td></tr><tr><td>BIZARRI</td><td>71</td><td>NP</td><td>B27</td><td>140</td><td>R. Bizzarri et al.</td><td>(CERN, CDEF)</td></tr><tr><td>COYNE</td><td>71</td><td>NP</td><td>B32</td><td>333</td><td>D.G. Coyne et al.</td><td>(LRIL)</td></tr><tr><td>MOFFEIT</td><td>71</td><td>NP</td><td>B29</td><td>349</td><td>K.C. Moffet et al.</td><td>(LRL, UCB, SLAC+)</td></tr><tr><td>ABRAMOV...</td><td>70B</td><td>NP</td><td>B20</td><td>209</td><td>M. Abramovich et al.</td><td>(CERN)</td></tr><tr><td>BIGGS</td><td>70B</td><td>PR</td><td>24</td><td>1201</td><td>P.J. Biggs et al.</td><td>(DARE)</td></tr><tr><td>BIZARRI</td><td>70B</td><td>JP</td><td>15</td><td>1385</td><td>R. Bizzarri et al.</td><td>(ROMA, SYRA)</td></tr><tr><td>ROOS</td><td>70</td><td>DNPL/R</td><td>173</td><td>173</td><td>M. Roos</td><td>(CERN)</td></tr><tr><td>Proc. Daresbury</td><td>70</td><td>Procs.</td><td>Daresbury</td><td>Weekend No. 1.</td><td></td><td></td></tr><tr><td>AUGUSTIN</td><td>69</td><td>PL</td><td>28B</td><td>51</td><td>J.E. Augustin et al.</td><td>(ORSAY)</td></tr><tr><td>BIZARRI</td><td>69</td><td>NP</td><td>B14</td><td>169</td><td>R. Bizzarri et al.</td><td>(CERN, CDEF)</td></tr><tr><td>DEINET</td><td>69B</td><td>PL</td><td>30B</td><td>426</td><td>W. Deinet et al.</td><td>(KARL, CERN)</td></tr><tr><td>JACQUET</td><td>69B</td><td>NC</td><td>63A</td><td>743</td><td>F. Jacquet et al.</td><td>(EPOL, BERG)</td></tr><tr><td>WILSON</td><td>69</td><td>PR</td><td>14</td><td>299</td><td>R. Wilson et al.</td><td>(HARY)</td></tr><tr><td>Also</td><td></td><td>Translated from</td><td>YAF</td><td>13</td><td>A.A. Wohrmann et al.</td><td>(HARV, CASE, SLAC+)</td></tr><tr><td>ASTVACAT...</td><td>68</td><td>PL</td><td>27B</td><td>45</td><td>R.G. Astvatsaturov et al.</td><td>(JINR, MOSU)</td></tr><tr><td>BOLLINI</td><td>68C</td><td>NC</td><td>56A</td><td>531</td><td>D. Bollini et al.</td><td>(CERN, BGN, STRB)</td></tr><tr><td>GOUNARIS</td><td>68</td><td>PR</td><td>21</td><td>244</td><td>G.J. Gounaris, J.J. Sakurai</td><td>(COLU)</td></tr><tr><td>BARASH</td><td>68B</td><td>PR</td><td>156</td><td>1399</td><td>N. Barash et al.</td><td>(PENN)</td></tr><tr><td>FELDMAN</td><td>67C</td><td>PR</td><td>159</td><td>1219</td><td>M. Feldman et al.</td><td>(SERP)</td></tr><tr><td>DIGIUGNO</td><td>66B</td><td>NC</td><td>44A</td><td>1272</td><td>G. Di Giugno et al.</td><td>(NAPL, FRAS, TRST)</td></tr><tr><td>FLATTE</td><td>66</td><td>PR</td><td>145</td><td>1050</td><td>S.M. Flatte et al.</td><td>(LRIL)</td></tr><tr><td>JAMES</td><td>66</td><td>PR</td><td>142</td><td>896</td><td>F. James, H.L. Kraybill</td><td>(YALE, BNL)</td></tr><tr><td>BARBARO...</td><td>65</td><td>PR</td><td>14</td><td>279</td><td>A. Barbaro-Gallerini, R.D. Tripp</td><td>(LRIL)</td></tr><tr><td>BARMIN</td><td>64</td><td>JP</td><td>12</td><td>1829</td><td>V.V. Barmin et al.</td><td>(ITEF)</td></tr><tr><td>KRAEMER</td><td>64</td><td>PR</td><td>136</td><td>89</td><td>Translated from</td><td>(JHU, NWES, WOOD)</td></tr><tr><td>BUSCHBECK</td><td>63</td><td>R.W.</td><td>134</td><td>B496</td><td>R.W. Kraemer et al.</td><td>(VIEN, CERN, ANIK)</td></tr><tr><td>Siena</td><td>63</td><td>Conf. 1</td><td>166</td><td></td><td>B. Buschbeck et al.</td><td></td></tr></tbody></table>

$\eta'(958)$

$I^G(jPC) = 0^+(0^-)$

## $\eta'(958)$ MASS

<table><thead><tr><th>VALUE (MeV)</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>957.793 ±0.06</td><td>OUR AVERAGE</td><td></td><td></td><td></td></tr><tr><td>957.9 ±0.2</td><td>±0.6</td><td>80</td><td>CLEO</td><td>$J/\psi \to \gamma \eta'$</td></tr><tr><td>957.46 ±0.33</td><td>±0.3</td><td>96</td><td>SPEC</td><td>$1.68 p d \to ^3\text{He}\eta'$</td></tr><tr><td>958.2 ±0.5</td><td>±0.1</td><td>74</td><td>MMS</td><td>$\pi^- p \to n \text{MM}$</td></tr><tr><td>958.2</td><td>±0.1</td><td>73</td><td>HBC</td><td>$2.2 K^- p \to \Lambda'\eta'$</td></tr><tr><td>958</td><td>±0.1</td><td>73</td><td>JACOBS</td><td>$2.9 K^- p \to \Lambda'\eta'$</td></tr><tr><td>956.1 ±1.1</td><td>±1.1</td><td>1</td><td>1BASILE</td><td>$\pi^- n p \to n \eta'$</td></tr></tbody></table>
• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>957.5</td><td>±0.2</td><td>BAI</td><td>04J</td><td>BES2</td><td>J/ψ → γγπ<sup>+</sup>π<sup>-</sup></td></tr><tr><td>959</td><td>±1</td><td>630</td><td>2 BELADIDZE</td><td>92C</td><td>VES</td><td>36 π<sup>-</sup> Be → π<sup>-</sup>η<sup>-</sup>ηBe</td></tr><tr><td>958</td><td>±1</td><td>340</td><td>2 ARMSTRONG</td><td>91B</td><td>OMEG</td><td>300 pp → ppηπ<sup>+</sup>π<sup>-</sup></td></tr><tr><td>958.2</td><td>±0.4</td><td>622</td><td>2 AUGUSTIN</td><td>90</td><td>DM2</td><td>J/ψ → γηπ<sup>+</sup>π<sup>-</sup></td></tr><tr><td>957.8</td><td>±0.2</td><td>2420</td><td>2 AUGUSTIN</td><td>90</td><td>DM2</td><td>J/ψ → γγπ<sup>+</sup>π<sup>-</sup></td></tr><tr><td>956.3</td><td>±1.0</td><td>143</td><td>2 GIDAL</td><td>87</td><td>MRK2</td><td>e<sup>+</sup> e<sup>-</sup> → e<sup>+</sup> e<sup>-</sup>ηπ<sup>+</sup>π<sup>-</sup></td></tr><tr><td>957.4</td><td>±1.4</td><td>535</td><td>3 BASILE</td><td>71</td><td>CNTR</td><td>1.6 π<sup>-</sup> p → nη<sup>′</sup></td></tr><tr><td>957</td><td>±1</td><td></td><td>RI TTENBERG</td><td>69</td><td>HBC</td><td>1.7-2.7 K<sup>-</sup> p</td></tr></table>

¹ Using all η' decays.

² Systematic uncertainty not estimated.

³ Using η' decays into neutrals. Not independent of the other listed BASILE 71 η' mass measurement.

η'(958) WIDTH

<table><thead><tr><th>VALUE (MeV)</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>CHG</th><th>COMMENT</th></tr></thead><tbody><tr><td colspan="6"><strong>0.188 ± 0.006 OUR FIT</strong></td></tr><tr><td colspan="6"><strong>0.230 ± 0.021 OUR AVERAGE</strong></td></tr><tr><td>0.226 ± 0.017 ± 0.014</td><td>2300</td><td>CZERWINSKI</td><td>10</td><td>MMS</td><td>pp → ppη<sup>′</sup></td></tr><tr><td>0.40 ± 0.22</td><td>4800</td><td>WURZINGER</td><td>96</td><td>SPEC</td><td>1.68 pd → <sup>3</sup>Heη<sup>′</sup></td></tr><tr><td>0.28 ± 0.10</td><td>1000</td><td>BINNIE</td><td>79</td><td>MMS</td><td>π<sup>-</sup> p → nMM</td></tr><tr><td colspan="6"><strong>• • • We do not use the following data for averages, fits, limits, etc. • • •</strong></td></tr><tr><td>0.20 ± 0.04</td><td>BAI</td><td>04J</td><td>BES2</td><td></td><td>J/ψ → γγπ<sup>+</sup>π<sup>-</sup></td></tr></tbody></table>

η'(958) DECAY MODES

<table><thead><tr><th>Mode</th><th>Fraction (Γ<sub>i</sub>/Γ)</th><th>Confidence level</th></tr></thead><tbody><tr><td>Γ<sub>1</sub> π<sup>+</sup> π<sup>-</sup> η</td><td>(42.5 ± 0.5)</td><td>%</td></tr><tr><td>Γ<sub>2</sub> ρ<sup>0</sup> γ (including non-resonant π<sup>+</sup> π<sup>-</sup> γ)</td><td>(29.5 ± 0.4)</td><td>%</td></tr><tr><td>Γ<sub>3</sub> ρ<sup>0</sup> γ</td><td></td><td></td></tr><tr><td>Γ<sub>4</sub> π<sup>0</sup> π<sup>0</sup> η</td><td>(22.4 ± 0.5)</td><td>%</td></tr><tr><td>Γ<sub>5</sub> ωγ</td><td>(2.52 ± 0.07)</td><td>%</td></tr><tr><td>Γ<sub>6</sub> ωe<sup>+</sup> e<sup>-</sup></td><td>(2.0 ± 0.4)</td><td>× 10<sup>-4</sup></td></tr><tr><td>Γ<sub>7</sub> γγ</td><td>(2.307 ± 0.033)</td><td>%</td></tr><tr><td>Γ<sub>8</sub> 3π<sup>0</sup></td><td>(2.50 ± 0.17)</td><td>× 10<sup>-3</sup></td></tr><tr><td>Γ<sub>9</sub> μ<sup>+</sup> μ<sup>-</sup> γ</td><td>(1.13 ± 0.28)</td><td>× 10<sup>-4</sup></td></tr><tr><td>Γ<sub>10</sub> π<sup>+</sup> π<sup>-</sup> μ<sup>+</sup> μ<sup>-</sup></td><td>(1.9 ± 0.4)</td><td>× 10<sup>-5</sup></td></tr><tr><td>Γ<sub>11</sub> π<sup>+</sup> π<sup>-</sup> π<sup>0</sup></td><td>(3.61 ± 0.17)</td><td>× 10<sup>-3</sup></td></tr><tr><td>Γ<sub>12</sub> (π<sup>+</sup> π<sup>-</sup> π<sup>0</sup>) S-wave</td><td>(3.8 ± 0.5)</td><td>× 10<sup>-3</sup></td></tr><tr><td>Γ<sub>13</sub> π<sup>+</sup> ρ<sup>±</sup></td><td>(7.4 ± 2.3)</td><td>× 10<sup>-4</sup></td></tr><tr><td>Γ<sub>14</sub> 2(π<sup>+</sup> π<sup>-</sup>)</td><td>(8.3 ± 0.9)</td><td>× 10<sup>-5</sup></td></tr><tr><td>Γ<sub>15</sub> π<sup>+</sup> π<sup>-</sup> 2π<sup>0</sup></td><td>(1.8 ± 0.4)</td><td>× 10<sup>-4</sup></td></tr><tr><td>Γ<sub>16</sub> 2(π<sup>+</sup> π<sup>-</sup>) neutrals</td><td>&lt; 1</td><td>%</td></tr><tr><td>Γ<sub>17</sub> 2(π<sup>+</sup> π<sup>-</sup>) π<sup>0</sup></td><td>&lt; 1.8</td><td>× 10<sup>-3</sup></td></tr><tr><td>Γ<sub>18</sub> 2(π<sup>+</sup> π<sup>-</sup>) 2π<sup>0</sup></td><td>&lt; 1</td><td>%</td></tr><tr><td>Γ<sub>19</sub> 3(π<sup>+</sup> π<sup>-</sup>)</td><td>&lt; 3.1</td><td>× 10<sup>-5</sup></td></tr><tr><td>Γ<sub>20</sub> K<sup>±</sup> π<sup>±</sup></td><td>&lt; 4</td><td>× 10<sup>-5</sup></td></tr><tr><td>Γ<sub>21</sub> π<sup>+</sup> π<sup>-</sup> e<sup>+</sup> e<sup>-</sup></td><td>(2.42 ± 0.10)</td><td>× 10<sup>-3</sup></td></tr><tr><td>Γ<sub>22</sub> π<sup>+</sup> e<sup>-</sup> νe + c.c.</td><td>&lt; 2.1</td><td>× 10<sup>-4</sup></td></tr><tr><td>Γ<sub>23</sub> γe<sup>+</sup> e<sup>-</sup></td><td>(4.91 ± 0.27)</td><td>× 10<sup>-4</sup></td></tr><tr><td>Γ<sub>24</sub> π<sup>0</sup> γγ</td><td>(3.20 ± 0.24)</td><td>× 10<sup>-3</sup></td></tr><tr><td>Γ<sub>25</sub> π<sup>0</sup> γγ (non resonant)</td><td>(6.2 ± 0.9)</td><td>× 10<sup>-4</sup></td></tr><tr><td>Γ<sub>26</sub> ηγγ</td><td>&lt; 1.33</td><td>× 10<sup>-4</sup></td></tr><tr><td>Γ<sub>27</sub> 4π<sup>0</sup></td><td>&lt; 4.94</td><td>× 10<sup>-5</sup></td></tr><tr><td>Γ<sub>28</sub> e<sup>+</sup> e<sup>-</sup></td><td>&lt; 5.6</td><td>× 10<sup>-9</sup></td></tr><tr><td>Γ<sub>29</sub> e<sup>+</sup> e<sup>-</sup> e<sup>+</sup> e<sup>-</sup></td><td>(4.5 ± 1.1)</td><td>× 10<sup>-6</sup></td></tr><tr><td>Γ<sub>30</sub> invisible</td><td>&lt; 6</td><td>× 10<sup>-4</sup></td></tr></tbody></table>

Charge conjugation (C), Parity (P), Lepton family number (LF) violating modes

<table><tr><td>Γ<sub>31</sub> π<sup>+</sup> π<sup>-</sup></td><td>P,CP</td><td>&lt; 1.8</td><td>× 10<sup>-5</sup></td><td>90%</td></tr><tr><td>Γ<sub>32</sub> π<sup>0</sup> π<sup>0</sup></td><td>P,CP</td><td>&lt; 4</td><td>× 10<sup>-4</sup></td><td>90%</td></tr><tr><td>Γ<sub>33</sub> π<sup>0</sup> e<sup>+</sup> e<sup>-</sup></td><td>C</td><td>[a] &lt; 1.4</td><td>× 10<sup>-3</sup></td><td>90%</td></tr><tr><td>Γ<sub>34</sub> π<sup>0</sup> ρ<sup>0</sup></td><td>C</td><td>&lt; 4</td><td>%</td><td>90%</td></tr><tr><td>Γ<sub>35</sub> ηe<sup>+</sup> e<sup>-</sup></td><td>C</td><td>[a] &lt; 2.4</td><td>× 10<sup>-3</sup></td><td>90%</td></tr><tr><td>Γ<sub>36</sub> 3γ</td><td>C</td><td>&lt; 1.0</td><td>× 10<sup>-4</sup></td><td>90%</td></tr><tr><td>Γ<sub>37</sub> μ<sup>+</sup> μ<sup>-</sup> π<sup>0</sup></td><td>C</td><td>[a] &lt; 6.0</td><td>× 10<sup>-5</sup></td><td>90%</td></tr><tr><td>Γ<sub>38</sub> μ<sup>+</sup> μ<sup>-</sup> η</td><td>C</td><td>[a] &lt; 1.5</td><td>× 10<sup>-5</sup></td><td>90%</td></tr><tr><td>Γ<sub>39</sub> eμ</td><td>LF</td><td>&lt; 4.7</td><td>× 10<sup>-4</sup></td><td>90%</td></tr></table>

[a] C parity forbids this to occur as a single-photon process.

CONSTRAINED FIT INFORMATION

An overall fit to the total width, a partial width, 2 combinations of partial widths obtained from integrated cross section, and 20 branching ratios uses 52 measurements and one constraint to determine 9 parameters. The overall fit has a $\chi^2 = 69.5$ for 44 degrees of freedom.

The following off-diagonal array elements are the correlation coefficients $\langle\delta p_i \delta p_j\rangle / (\delta p_i \cdot \delta p_j)$, in percent, from the fit to parameters $p_i$, including the branching fractions, $x_i \equiv \Gamma_i / \Gamma_{\text{total}}$. The fit constrains the $x_i$ whose labels appear in this array to sum to one.

<table><tr><td>x<sub>2</sub></td><td>-25</td></tr><tr><td>x<sub>4</sub></td><td>-75 -43</td></tr><tr><td>x<sub>5</sub></td><td>-7 -6 -2</td></tr><tr><td>x<sub>7</sub></td><td>-11 -7 9 -1</td></tr><tr><td>x<sub>8</sub></td><td>-17 -10 19 0 2</td></tr><tr><td>x<sub>11</sub></td><td>-1 -1 -1 0 0 0</td></tr><tr><td>x<sub>21</sub></td><td>-8 30 -14 -2 -2 -3 0</td></tr><tr><td>Γ</td><td>11 -10 -1 1 -40 0 0 -3</td></tr></table>

<table><thead><tr><th>Mode</th><th>Rate (MeV)</th></tr></thead><tbody><tr><td>Γ<sub>1</sub> π<sup>+</sup> π<sup>-</sup> η</td><td>0.0799 ± 0.0029</td></tr><tr><td>Γ<sub>2</sub> ρ<sup>0</sup> γ (including non-resonant π<sup>+</sup> π<sup>-</sup> γ)</td><td>0.0554 ± 0.0019</td></tr><tr><td>Γ<sub>4</sub> π<sup>0</sup> π<sup>0</sup> η</td><td>0.0421 ± 0.0017</td></tr><tr><td>Γ<sub>5</sub> ωγ</td><td>0.00474 ± 0.00020</td></tr><tr><td>Γ<sub>7</sub> γγ</td><td>0.00434 ± 0.00013</td></tr><tr><td>Γ<sub>8</sub> 3π<sup>0</sup></td><td>(4.7 ± 0.4) × 10<sup>-4</sup></td></tr><tr><td>Γ<sub>11</sub> π<sup>+</sup> π<sup>-</sup> π<sup>0</sup></td><td>(6.8 ± 0.4) × 10<sup>-4</sup></td></tr><tr><td>Γ<sub>21</sub> π<sup>+</sup> π<sup>-</sup> e<sup>+</sup> e<sup>-</sup></td><td>(4.54 ± 0.23) × 10<sup>-4</sup></td></tr></tbody></table>

η'(958) PARTIAL WIDTHS

<table><tr><td>Γ(γγ)</td><td>Γ<sub>7</sub></td></tr></table>

<table><tr><td colspan="5"><strong>4.34 ± 0.14 OUR FIT</strong></td></tr><tr><td colspan="5"><strong>4.28 ± 0.19 OUR AVERAGE</strong></td></tr><tr><td>4.17 ± 0.10 ± 0.27</td><td>2000</td><td>1 ACCIARRI</td><td>98Q</td><td>L3</td><td>e<sup>+</sup> e<sup>-</sup> → e<sup>+</sup> e<sup>-</sup> π<sup>+</sup> π<sup>-</sup> γ</td></tr><tr><td>4.53 ± 0.29 ± 0.51</td><td>266</td><td>KARCH</td><td>92</td><td>CBAL</td><td>e<sup>+</sup> e<sup>-</sup> → e<sup>+</sup> e<sup>-</sup> ηπ<sup>0</sup> π<sup>0</sup></td></tr><tr><td>3.61 ± 0.13 ± 0.48</td><td></td><td>2 BEHREND</td><td>91</td><td>CELL</td><td>e<sup>+</sup> e<sup>-</sup> → e<sup>+</sup> e<sup>-</sup> η<sup>-</sup>γ'(958)</td></tr><tr><td>4.6 ± 1.1 ± 0.6</td><td>23</td><td>BARU</td><td>90</td><td>MD1</td><td>e<sup>+</sup> e<sup>-</sup> → e<sup>+</sup> e<sup>-</sup> π<sup>+</sup> π<sup>-</sup> γ</td></tr><tr><td>4.57 ± 0.25 ± 0.44</td><td></td><td>BUTLER</td><td>90</td><td>MRK2</td><td>e<sup>+</sup> e<sup>-</sup> → e<sup>+</sup> e<sup>-</sup> η<sup>-</sup>γ'(958)</td></tr><tr><td>5.08 ± 0.24 ± 0.71</td><td>547</td><td>3 ROE</td><td>90</td><td>ASP</td><td>e<sup>+</sup> e<sup>-</sup> → e<sup>+</sup> e<sup>-</sup> 2γ</td></tr><tr><td>3.8 ± 0.7 ± 0.6</td><td>34</td><td>AIHARA</td><td>88c</td><td>TPC</td><td>e<sup>+</sup> e<sup>-</sup> → e<sup>+</sup> e<sup>-</sup> ηπ<sup>+</sup> π<sup>-</sup></td></tr><tr><td>4.9 ± 0.5 ± 0.5</td><td>136</td><td>4 WILLIAMS</td><td>88</td><td>CBAL</td><td>e<sup>+</sup> e<sup>-</sup> → e<sup>+</sup> e<sup>-</sup> 2γ</td></tr></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>4.7 ± 0.6 ± 0.9</td><td>143</td><td>5 GIDAL</td><td>87</td><td>MRK2</td><td>e<sup>+</sup> e<sup>-</sup> → e<sup>+</sup> e<sup>-</sup> ηπ<sup>+</sup> π<sup>-</sup></td></tr><tr><td>4.0 ± 0.9</td><td></td><td>6 BARTEL</td><td>85E</td><td>JADE</td><td>e<sup>+</sup> e<sup>-</sup> → e<sup>+</sup> e<sup>-</sup> 2γ</td></tr></table>

¹ No non-resonant π<sup>+</sup> π<sup>-</sup> contribution found.

² Reevaluated by us using B(η' → ρ(770)γ) = (30.2 ± 1.3)%.

³ Reevaluated by us using B(η' → γγ) = (2.11 ± 0.13)%.

⁴ Reevaluated by us using B(η' → γγ) = (2.11 ± 0.13)%.

⁵ Superseded by BUTLER 90.

⁶ Systematic error not evaluated.

<table><tr><td>Γ(e<sup>+</sup> e<sup>-</sup>)</td><td>Γ<sub>28</sub></td></tr><tr><td>VALUE (eV)</td><td>CL%</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td>&lt;1.1 × 10<sup>-3</sup></td><td>90</td><td>1,2 ACHASOV</td><td>15</td><td>SND</td><td>0.958 e<sup>+</sup> e<sup>-</sup> → ππη</td></tr></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>&lt;2.0 × 10<sup>-3</sup></td><td>90</td><td>2 ACHASOV</td><td>15</td><td>SND</td><td>0.958 e<sup>+</sup> e<sup>-</sup> → ππη</td></tr><tr><td>&lt;2.4 × 10<sup>-3</sup></td><td>90</td><td>2 AKHMETSHIN</td><td>15</td><td>CMD3</td><td>0.958 e<sup>+</sup> e<sup>-</sup> → π<sup>+</sup> π<sup>-</sup> η</td></tr></table>

¹ Combining data of ACHASOV 15 and AKHMETSHIN 15.

² Using η and η' branching fractions from PDG 14.

η'(958) Γ(i)Γ(γγ)/Γ(total)

This combination of a partial width with the partial width into γγ and with the total width is obtained from the integrated cross section into channel(i) in the γγ annihilation.

<table><tr><td>Γ(γγ) × Γ(ρ<sup>0</sup>γ (including non-resonant π<sup>+</sup> π<sup>-</sup> γ)) / Γ<sub>total</sub></td><td>Γ<sub>7</sub>Γ<sub>2</sub> / Γ</td></tr></table>

<table><tr><td>1.26 ± 0.07 OUR AVERAGE</td><td>Error includes scale factor of 1.2.</td></tr><tr><td>1.09 ± 0.04 ± 0.13</td><td>BEHREND 91 CELL e<sup>+</sup> e<sup>-</sup> → e<sup>+</sup> e<sup>-</sup> ρ(770)<sup>0</sup>γ</td></tr><tr><td>1.35 ± 0.09 ± 0.21</td><td>AIHARA 87 TPC e<sup>+</sup> e<sup>-</sup> → e<sup>+</sup> e<sup>-</sup> ργ</td></tr></table>
<table><tr><td>1.13 ± 0.04 ± 0.13</td><td>867</td><td>ALBRECHT</td><td>87B</td><td>ARG</td><td>e<sup>+</sup>e<sup>-</sup> → e<sup>+</sup>e<sup>-</sup>ργ</td></tr><tr><td>1.53 ± 0.09 ± 0.21</td><td></td><td>ALTHOFF</td><td>84E</td><td>TASS</td><td>e<sup>+</sup>e<sup>-</sup> → e<sup>+</sup>e<sup>-</sup>ργ</td></tr><tr><td>1.14 ± 0.08 ± 0.11</td><td>243</td><td>BERGER</td><td>84B</td><td>PLUT</td><td>e<sup>+</sup>e<sup>-</sup> → e<sup>+</sup>e<sup>-</sup>ργ</td></tr><tr><td>1.73 ± 0.34 ± 0.35</td><td>95</td><td>JENNI</td><td>83</td><td>MRK2</td><td>e<sup>+</sup>e<sup>-</sup> → e<sup>+</sup>e<sup>-</sup>ργ</td></tr><tr><td>1.49 ± 0.13 ± 0.027</td><td>213</td><td>BARTEL</td><td>82B</td><td>JADE</td><td>e<sup>+</sup>e<sup>-</sup> → e<sup>+</sup>e<sup>-</sup>ργ</td></tr></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>1.85 ± 0.31 ± 0.24</td><td>43</td><td>BEHREND</td><td>82C</td><td>CELL</td><td>e<sup>+</sup>e<sup>-</sup> → e<sup>+</sup>e<sup>-</sup>ργ</td></tr></table>

$$\Gamma(\gamma\gamma) \times \Gamma(\pi^0\pi^0\eta)/\Gamma_{\text{total}}$$

<table><tr><td>VALUE (keV)</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="4"><b>Γ<sub>7</sub>Γ<sub>4</sub>/Γ</b></td></tr></table>

0.97 ± 0.04 OUR FIT Error includes scale factor of 1.1.

<table><tr><td>0.92 ± 0.06 ± 0.11</td><td>1 KARCH</td><td>92</td><td>CBAL</td><td>e<sup>+</sup>e<sup>-</sup> → e<sup>+</sup>e<sup>-</sup>ηπ<sub>0</sub>π<sub>0</sub></td></tr></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>0.95 ± 0.05 ± 0.08</td><td>2 KARCH</td><td>90</td><td>CBAL</td><td>e<sup>+</sup>e<sup>-</sup> → e<sup>+</sup>e<sup>-</sup>ηπ<sub>0</sub>π<sub>0</sub></td></tr></table>

<table><tr><td>1.00 ± 0.08 ± 0.10</td><td>2,3 ANTREASYAN</td><td>87</td><td>CBAL</td><td>e<sup>+</sup>e<sup>-</sup> → e<sup>+</sup>e<sup>-</sup>ηπ<sub>0</sub>π<sub>0</sub></td></tr></table>

¹Reevaluated by us using B(η → γγ) = (39.21 ± 0.34)%. Supersedes ANTREASYAN 87 and KARCH 90.

²Superseded by KARCH 92.

³Using BR(η → 2γ)=(38.9 ± 0.5)%.

$$\eta'(958) \Gamma(\gamma) \Gamma(e^+ e^-) / \Gamma(\text{total})$$

$$\Gamma(\pi^+ \pi^- \eta) \times \Gamma(e^+ e^-) / \Gamma_{\text{total}}$$

<table><tr><td>VALUE (10<sup>-3</sup> eV)</td><td>CL%</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td><b>&lt;1.0</b></td><td>90</td><td>1 AKHMETSHIN</td><td>15</td><td>CMD3</td><td>0.958 e<sup>+</sup>e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>η</td></tr></table>

¹AKHMETSHIN 15 reports $[\Gamma(\eta'(958) \to \pi^+\pi^-\eta) \times \Gamma(\eta'(958) \to e^+e^-)/\Gamma_{\text{total}}] \times [B(\eta \to 2\gamma)] < 4.1 \times 10^{-4} \text{ eV which we divide by our best value } B(\eta \to 2\gamma) = 39.36 \times 10^{-2}$.

### η'(958) BRANCHING RATIOS

$$\Gamma(\pi^+ \pi^- \eta) / \Gamma_{\text{total}}$$

<table><tr><td>VALUE (units 10<sup>-2</sup>)</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td><b>42.5</b> ± <b>0.5</b> OUR FIT</td><td colspan="4">Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>41.24 ± 0.08 ± 1.24</td><td>312k</td><td>ABLIKIM</td><td>19T</td><td>BES</td><td>J/ψ → γη'</td></tr></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>42.4 ± 1.1 ± 0.4</td><td>1.2k</td><td>1 PEDLAR</td><td>09</td><td>CLEO</td><td>J/ψ → γη'</td></tr></table>

¹Not independent of other η' branching fractions and ratios in PEDLAR 09.

$$\Gamma(\pi^+ \pi^- \eta(\text{charged decay})) / \Gamma_{\text{total}}$$

<table><tr><td>VALUE (units 10<sup>-2</sup>)</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>0.1191 ± 0.0015</b> OUR FIT Error includes scale factor of 1.1.</td></tr></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>0.123 ± 0.014</td><td>107</td><td>RITTENBERG</td><td>69</td><td>HBC</td><td>1.7-2.7 K<sup>-</sup> p</td></tr><tr><td>0.10 ± 0.04</td><td>10</td><td>LONDON</td><td>66</td><td>HBC</td><td>2.24 K<sup>-</sup> p → Λ2π<sup>+</sup>2π<sup>-</sup>π<sup>0</sup></td></tr><tr><td>0.07 ± 0.04</td><td>7</td><td>BADIER</td><td>65B</td><td>HBC</td><td>3 K<sup>-</sup> p</td></tr></table>

$$\Gamma(\pi^+ \pi^- \eta(\text{neutral decay})) / \Gamma_{\text{total}}$$

<table><tr><td>VALUE (units 10<sup>-2</sup>)</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>0.306 ± 0.004</b> OUR FIT Error includes scale factor of 1.1.</td></tr></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>0.314 ± 0.026</td><td>281</td><td>RITTENBERG</td><td>69</td><td>HBC</td><td>1.7-2.7 K<sup>-</sup> p</td></tr></table>

$$\Gamma(\rho^0\gamma(\text{including non-resonant } \pi^+ \pi^- \gamma)) / \Gamma_{\text{total}}$$

<table><tr><td>VALUE (units 10<sup>-2</sup>)</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td><b>29.5</b> ± <b>0.4</b> OUR FIT</td><td colspan="4">Error includes scale factor of 1.1.</td></tr></table>

29.90 ± 0.03 ± 0.55 913k ABLIKIM 19T BES J/ψ → γη'

<table><tr><td>28.7 ± 0.7 ± 0.4</td><td>0.2k</td><td>1 PEDLAR</td><td>09</td><td>CLEO</td><td>J/ψ → γη'</td></tr><tr><td>32.9 ± 3.3</td><td>298</td><td>RITTENBERG</td><td>69</td><td>HBC</td><td>1.7-2.7 K<sup>-</sup> p</td></tr><tr><td>20 ± 10</td><td>20</td><td>LONDON</td><td>66</td><td>HBC</td><td>2.24 K<sup>-</sup> p → Λπ<sup>+</sup>π<sup>-</sup>γ</td></tr><tr><td>34 ± 9</td><td>35</td><td>BADIER</td><td>65B</td><td>HBC</td><td>3 K<sup>-</sup> p</td></tr></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>29.90 ± 0.03 ± 0.55</td><td>913k</td><td>ABLIKIM</td><td>19T</td><td>BES</td><td>J/ψ → γη'</td></tr><tr><td>28.7 ± 0.7 ± 0.4</td><td>0.2k</td><td>1 PEDLAR</td><td>09</td><td>CLEO</td><td>J/ψ → γη'</td></tr><tr><td>32.9 ± 3.3</td><td>298</td><td>RITTENBERG</td><td>69</td><td>HBC</td><td>1.7-2.7 K<sup>-</sup> p</td></tr><tr><td>20 ± 10</td><td>20</td><td>LONDON</td><td>66</td><td>HBC</td><td>2.24 K<sup>-</sup> p → Λπ<sup>+</sup>π<sup>-</sup>γ</td></tr><tr><td>34 ± 9</td><td>35</td><td>BADIER</td><td>65B</td><td>HBC</td><td>3 K<sup>-</sup> p</td></tr></table>

¹Not independent of other η' branching fractions and ratios in PEDLAR 09.

$$\Gamma(\rho^0\gamma) / \Gamma_{\text{total}}$$

<table><tr><td>VALUE (%)</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>0.694 ± 0.014</b> OUR FIT Error includes scale factor of 1.1.</td></tr></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>33.34 ± 0.06 ± 1.60</td><td>970k</td><td>1 ABLIKIM</td><td>18c</td><td>BES3</td><td>η'(958) → γπ<sup>+</sup>π<sup>-</sup></td></tr><tr><td>34.43 ± 0.52 ± 1.97</td><td>970k</td><td>2 ABLIKIM</td><td>18c</td><td>BES3</td><td>η'(958) → γπ<sup>+</sup>π<sup>-</sup></td></tr></table>

¹From a fit to π<sup>+</sup>π<sup>-</sup> mass using ρ(770), ω(782), and box anomaly components.

²From a fit to π<sup>+</sup>π<sup>-</sup> mass using ρ(770), ω(782), and ρ(1450) components.

$$\Gamma(\rho^0\gamma(\text{including non-resonant } \pi^+ \pi^- \gamma)) / \Gamma(\pi^+ \pi^- \eta)$$

<table><tr><td>VALUE</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="4"><b>0.683 ± 0.020</b> OUR AVERAGE Error includes scale factor of 1.1.</td></tr></table>

0.683 ± 0.020 OUR AVERAGE

<table><tr><td>0.677 ± 0.024 ± 0.011</td><td>PEDLAR</td><td>09</td><td>CLE3</td><td>J/ψ → η'γ</td></tr><tr><td>0.69 ± 0.03</td><td>ABLIKIM</td><td>06E</td><td>BES2</td><td>J/ψ → η'γ</td></tr></table>

$$\Gamma(\rho^0\gamma(\text{including non-resonant } \pi^+ \pi^- \gamma)) / \Gamma(\pi^+ \pi^- \eta(\text{neutral decay}))$$

<table><tr><td>VALUE</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>Γ<sub>2</sub>/0.714Γ<sub>1</sub></b></td></tr></table>

<table><tr><td>0.972 ± 0.020 OUR FIT</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>0.97 ± 0.09</b> OUR AVERAGE Error includes scale factor of 1.1.</td></tr></table>

0.972 ± 0.020 OUR FIT Error includes scale factor of 1.1.

<table><tr><td>0.70 ± 0.22</td><td>AMSLER</td><td>04B</td><td>CBAR</td><td>0 p → π<sup>+</sup>π<sup>-</sup>η</td></tr><tr><td>1.07 ± 0.17</td><td>BELADIDZE</td><td>92c</td><td>VES</td><td>36 π<sup>-</sup> Be → π<sup>-</sup>η'η Be</td></tr><tr><td>0.92 ± 0.14</td><td>DANBURG</td><td>73</td><td>HBC</td><td>2.2 K<sup>-</sup> p → Λχ<sup>0</sup></td></tr><tr><td>1.11 ± 0.18</td><td>JACOBS</td><td>73</td><td>HBC</td><td>2.9 K<sup>-</sup> p → Λχ<sup>0</sup></td></tr></table>

$$\Gamma(\pi^0\pi^0\eta) / \Gamma_{\text{total}}$$

<table><tr><td>VALUE (units 10<sup>-2</sup>)</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>22.4 ± 0.6</b> OUR FIT Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>21.36 ± 0.10 ± 0.92</td><td>52k</td><td>ABLIKIM</td><td>19T</td><td>BES</td><td>J/ψ → γη'</td></tr></table>

<table><tr><td>0.527 ± 0.019 OUR FIT</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>0.555 ± 0.043 ± 0.013</b> Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>0.527 ± 0.019 OUR FIT</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>0.555 ± 0.043 ± 0.013</b> Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>23.5 ± 1.3 ± 0.4</td><td>3.2k</td><td>1 PEDLAR</td><td>09</td><td>CLEO</td><td>J/ψ → γη'</td></tr></table>

¹Not independent of other η' branching fractions and ratios in PEDLAR 09.

$$\Gamma(\pi^0\pi^0\eta(3\pi^0\eta'\eta)) / \Gamma_{\text{total}}$$

<table><tr><td>VALUE</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>0.0718 ± 0.0018</b> OUR FIT Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>0.0718 ± 0.0018 OUR FIT</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>0.0718 ± 0.0018</b> OUR FIT Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>0.11 ± 0.06</td><td>4</td><td>BENSINGER</td><td>70</td><td>DBC</td><td>2.2 π<sup>+</sup> d</td></tr></table>

$$\Gamma(\pi^0\pi^0\eta) / \Gamma(\pi^+\pi^-\eta)$$

<table><tr><td>VALUE</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>0.527 ± 0.019</b> OUR FIT Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>0.527 ± 0.019 OUR FIT</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>0.527 ± 0.019</b> OUR FIT Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>0.555 ± 0.043 ± 0.013</td><td>PEDLAR</td><td>09</td><td>CLE3</td><td>J/ψ → η'γ</td></tr></table>

$$\Gamma(\rho^0\gamma(\text{including non-resonant } \pi^+ \pi^- \gamma)) / \Gamma(\pi\pi\eta)$$

<table><tr><td>VALUE</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>0.454 ± 0.009</b> OUR FIT Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>0.43 ± 0.02 ± 0.02</td><td>BARBERIS</td><td>98C</td><td>OMEG</td><td>450 p → p<sub>f</sub>η'p<sub>s</sub></td></tr></table>

<table><tr><td>0.454 ± 0.009 OUR FIT</td><td>BARBERIS</td><td>98C</td><td>OMEG</td><td>450 p → p<sub>f</sub>η'p<sub>s</sub></td></tr><tr><td colspan="5"><b>0.454 ± 0.009</b> OUR FIT Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>0.31 ± 0.15</td><td>DAVIS</td><td>68</td><td>HBC</td><td>5.5 K<sup>-</sup> p</td></tr></table>

$$\Gamma(\omega\gamma) / \Gamma_{\text{total}}$$

<table><tr><td>VALUE (units 10<sup>-2</sup>)</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>2.52 ± 0.07</b> OUR FIT Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>2.52 ± 0.07 OUR FIT</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>2.50 ± 0.07</b> OUR AVERAGE Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>2.489 ± 0.018 ± 0.074</td><td>23k</td><td>ABLIKIM</td><td>19T</td><td>BES</td><td>J/ψ → γη'</td></tr><tr><td>2.55 ± 0.03 ± 0.16</td><td>33.2k</td><td>1 ABLIKIM</td><td>15AD BES3</td><td>BES3</td><td>J/ψ → γη'</td></tr></table>

<table><tr><td>2.489 ± 0.018 ± 0.074</td><td>23k</td><td>ABLIKIM</td><td>19T</td><td>BES</td><td>J/ψ → γη'</td></tr><tr><td>2.55 ± 0.03 ± 0.16</td><td>33.2k</td><td>1 ABLIKIM</td><td>15AD BES3</td><td>BES3</td><td>J/ψ → γη'</td></tr></table>

<table><tr><td>2.34 ± 0.30 ± 0.04</td><td>70</td><td>2 PEDLAR</td><td>09</td><td>CLEO</td><td>J/ψ → γη'</td></tr></table>

¹Using B(J/ψ → η'γ) = (5.15 ± 0.16)×10<sup>-3</sup> and B(ω → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup>) = (89.2 ± 0.7)%.

²Not independent of other η' branching fractions and ratios in PEDLAR 09.

$$\Gamma(\omega\gamma) / \Gamma(\pi^+\pi^-\eta)$$

<table><tr><td>VALUE (units 10<sup>-2</sup>)</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>0.0593 ± 0.0018</b> OUR FIT Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>0.0593 ± 0.0018 OUR FIT</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>0.0593 ± 0.0018</b> OUR FIT Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>0.055 ± 0.007 ± 0.001</td><td>PEDLAR</td><td>09</td><td>CLE3</td><td>J/ψ → η'γ</td></tr></table>

<table><tr><td>0.055 ± 0.007 ± 0.001</td><td>PEDLAR</td><td>09</td><td>CLE3</td><td>J/ψ → η'γ</td></tr><tr><td colspan="5"><b>0.055 ± 0.007 ± 0.001</b> Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>0.068 ± 0.013</td><td>68</td><td>ZANFINO</td><td>77</td><td>ASPK</td><td>8.4 π<sup>-</sup> p</td></tr></table>

$$\Gamma(\omega\gamma) / \Gamma(\pi^0\pi^0\eta)$$

<table><tr><td>VALUE (units 10<sup>-2</sup>)</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>0.113 ± 0.004</b> OUR FIT Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>0.113 ± 0.004 OUR FIT</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>0.113 ± 0.004</b> OUR FIT Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>0.147 ± 0.016</td><td>ALDE</td><td>87B</td><td>GAM2</td><td>38 π<sup>-</sup> p → n4γ</td></tr></table>

$$\Gamma(\omega e^+ e^-) / \Gamma(\omega\gamma)$$

<table><tr><td>VALUE (units 10<sup>-3</sup>)</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>0.437 ± 0.008</b> OUR FIT Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>0.771 ± 1.34 ± 0.54</td><td>1 ABLIKIM</td><td>15AD BES3</td><td>J/ψ → η'γ</td></tr></table>

¹Obtained from other ABLIKIM 15AD measurements with common systematics taken into account.

$$\Gamma(\omega e^+ e^-) / \Gamma_{\text{total}}$$

<table><tr><td>VALUE (units 10<sup>-4</sup>)</td><td>EVTS</td><td>DOCUMENT ID</td><td>TECN</td><td>COMMENT</td></tr><tr><td colspan="5"><b>1.97 ± 0.34 ± 0.17</b> Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>1.97 ± 0.34 ± 0.17</td><td>66</td><td>1 ABLIKIM</td><td>15AD BES3</td><td>J/ψ → η'γ</td></tr></table>

¹Using B(J/ψ → η'γ) = (5.15 ± 0.16)×10<sup>-3</sup> and B(ω → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup>) = (89.2 ± 0.7)%.

$$\Gamma(\rho^0\gamma(\text{including non-resonant } \pi^+ \pi^- \gamma)) / [\Gamma(\pi^+ \pi^- \eta) + \Gamma(\rho^0\pi^0\eta) + \Gamma(\omega\gamma)]$$

<table><tr><td>Γ<sub>2</sub>/[Γ<sub>1</sub>+Γ<sub>4</sub>+Γ<sub>5</sub>]</td><td>0.437 ± 0.008 OUR FIT Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>0.437 ± 0.008 OUR FIT</td><td>0.437 ± 0.008 OUR FIT Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>0.437 ± 0.008 OUR FIT</td><td>0.437 ± 0.008 OUR FIT Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>0.437 ± 0.008 OUR FIT</td><td>0.437 ± 0.008 OUR FIT Error includes scale factor of 1.1.</td></tr></table>

<table><tr><td>0.25 ± 0.14</td><td>DAUBER</td><td>64</td><td>HBC</td><td>1.95 K<sup>-</sup> p</td></tr></table>
$$ \begin{array}{l} \frac{[\Gamma(\pi^0 \pi^0 \eta(\text{charged decay})) + \Gamma(\omega(\text{charged decay})\gamma)]}{\Gamma_{\text{total}}} \\ \frac{(0.286\Gamma_4 + 0.89\Gamma_5)}{\Gamma} \end{array} $$

0.0864 ± 0.0017 **OUR FIT** Error includes scale factor of 1.1.

• • • We do not use the following data for averages, fits, limits, etc. • • •

0.045 ± 0.029 42 RITTENBERG 69 HBC 1.7-2.7 K⁻p

$$ \begin{array}{l} \frac{\Gamma(\pi^+ \pi^- \text{ neutrals})}{\Gamma_{\text{total}}} \\ \frac{(0.714\Gamma_1 + 0.286\Gamma_4 + 0.89\Gamma_5)}{\Gamma} \end{array} $$

0.3897 ± 0.0028 **OUR FIT** Error includes scale factor of 1.1.

• • • We do not use the following data for averages, fits, limits, etc. • • •

0.4 ± 0.1 39 LONDON 66 HBC 2.24 K⁻p → Λπ⁺π⁻ neutrals
0.35 ± 0.06 33 BADIER 65B HBC 3 K⁻p

$$ \begin{array}{l} \frac{\Gamma(\gamma\gamma)}{\Gamma_{\text{total}}} \\ \frac{(\text{units } 10^{-2})}{\text{EVTS}} \end{array} $$

2.307 ± 0.035 **OUR FIT** Error includes scale factor of 1.1.

2.31 ± 0.06 **OUR AVERAGE** Error includes scale factor of 1.8.

2.331 ± 0.012 ± 0.035 71k ABLIKIM 19T BES J/ψ → γη'

1.99 +0.31 -0.27 ± 0.07 114 1 WICHT 08 BELL B⁺ → K⁺γγ

2.00 ± 0.18 2 STANTON 80 SPEC 8.45 π⁻p → nπ⁺π⁻2γ

• • • We do not use the following data for averages, fits, limits, etc. • • •

2.25 ± 0.16 ± 0.03 0.3k PEDLAR 09 CLEO J/ψ → γη'

1.8 ± 0.2 6000 4 APEL 79 NICE 15-40 π⁻p → n2γ

2.5 ± 0.7 68 DUANE 74 MMS π⁻p → nMM

1.71 ± 0.33 68 DALPIAZ 72 CNTR 1.6 π⁻p → nX⁰

2.0 +0.8 -0.6 31 HARVEY 71 OSPK 3.65 π⁻p → nX⁰

1 WICHT 08 reports $[\Gamma(\eta'(958) \rightarrow \gamma\gamma)/\Gamma_{\text{total}}] \times [B(B^{+} \rightarrow \eta'K^{+})] = (1.40^{+0.16}_{-0.15} \times 10^{-6}]$ which we divide by our best value $B(B^{+} \rightarrow \eta'K^{+}) = (7.04 \pm 0.25) \times 10^{-5}$. Our first error is their experiment's error and our second error is the systematic error from using our best value.

2 Includes APEL 79 result.

3 Not independent of other $η'$ branching fractions and ratios in PEDLAR 09.

4 Data is included in STANTON 80 evaluation.

$$ \begin{array}{l} \frac{\Gamma(\gamma\gamma)}{\Gamma(\pi^+ \pi^- \eta)} \\ \frac{(\text{units } 10^{-3})}{\text{EVTS}} \end{array} $$

0.0543 ± 0.0012 **OUR FIT** Error includes scale factor of 1.1.

0.053 ± 0.004 ± 0.001 PEDLAR 09 CLE3 J/ψ → η'γ

$$ \begin{array}{l} \frac{\Gamma(\gamma\gamma)}{\Gamma(\rho^0\gamma(\text{including non-resonant } \pi^+\pi^-\gamma))} \\ \frac{(\text{units } 10^{-3})}{\text{EVTS}} \end{array} $$

0.0783 ± 0.0016 **OUR FIT** Error includes scale factor of 1.1.

0.080 ± 0.008 ABLIKIM 06E BES2 J/ψ → η'γ

$$ \begin{array}{l} \frac{\Gamma(\gamma\gamma)}{\Gamma(\pi^0\pi^0\eta)} \\ \frac{(\text{units } 10^{-3})}{\text{EVTS}} \end{array} $$

0.1031 ± 0.0028 **OUR FIT**

0.105 ± 0.010 **OUR AVERAGE** Error includes scale factor of 1.9.

0.091 ± 0.009 AMSLER 93 CBAR 0.0 p

0.112 ± 0.002 ± 0.006 ALDE 87B GAM2 38 π⁻p → n2γ

$$ \begin{array}{l} \frac{\Gamma(\gamma\gamma)}{\Gamma(\pi^0\pi^0\eta(\text{neutral decay}))} \\ \frac{(\text{units } 10^{-3})}{\text{EVTS}} \end{array} $$

0.144 ± 0.004 **OUR FIT**

• • • We do not use the following data for averages, fits, limits, etc. • • •

0.188 ± 0.058 16 APEL 72 OSPK 3.8 π⁻p → nX⁰

$$ \begin{array}{l} \frac{\Gamma(\text{neutrals})}{\Gamma_{\text{total}}} \\ \frac{(0.714\Gamma_1 + 0.09\Gamma_5 + \Gamma_7)}{\Gamma} \end{array} $$

0.185 ± 0.004 **OUR FIT** Error includes scale factor of 1.1.

• • • We do not use the following data for averages, fits, limits, etc. • • •

0.185 ± 0.022 535 BASILE 71 CNTR 1.6 π⁻p → nX⁰

0.189 ± 0.026 123 RITTENBERG 69 HBC 1.7-2.7 K⁻p

$$ \begin{array}{l} \frac{\Gamma(\pi^0)}{\Gamma_{\text{total}}} \\ \frac{(\text{units } 10^{-3})}{\text{EVTS}} \end{array} $$

2.50 ± 0.17 **OUR FIT**

3.57 ± 0.26 **OUR AVERAGE**

3.522 ± 0.082 ± 0.254 2015 ABLIKIM 17 BES3 J/ψ → γ(3π⁰)

4.79 ± 0.59 ± 1.14 183 1 ABLIKIM 15P BES3 J/ψ → K⁺K⁻3π

• • • We do not use the following data for averages, fits, limits, etc. • • •

3.56 ± 0.22 ± 0.34 309 2 ABLIKIM 12E BES3 J/ψ → γ(3π⁰)

1 We have added all systematic uncertainties in quadrature to a single value.

2 Superseded by ABLIKIM 17.

$$ \begin{array}{l} \frac{\Gamma(\pi^0)}{\Gamma(\pi^0 \pi^0 \eta)} \\ \frac{(\text{units } 10^{-4})}{\text{EVTS}} \end{array} $$

112 ± 8 **OUR FIT**

78 ± 10 **OUR AVERAGE**

86 ± 19 235 BLIK 08 GAMS 32 π⁻p → η'η

74 ± 15 87B GAM2 38 π⁻p → n6γ

75 ± 18 84 GAM2 30-40 π⁻p → n6γ

$$ \begin{array}{l} \frac{\Gamma(\mu^+ \mu^- \eta)}{\Gamma(\gamma\gamma)} \\ \frac{(\text{units } 10^{-3})}{\text{EVTS}} \end{array} $$

4.9 ± 1.2 33 VIKTOROV 80 CNTR 25,33 π⁻p → 2μγ

$$ \begin{array}{l} \frac{\Gamma(\pi^+ \pi^- \mu^+ \mu^-)}{\Gamma_{\text{total}}} \\ \frac{(\text{units } 10^{-5})}{\text{CL%}} \end{array} $$

1.94 ± 0.37 ± 0.02 53 1 ABLIKIM 21I BES3 J/ψ → γη'(958)

• • • We do not use the following data for averages, fits, limits, etc. • • •

< 2.9 90 2 ABLIKIM 130 BES3 J/ψ → γη'

<24 90 3 NAIK 09 CLEO J/ψ → γη'

1 ABLIKIM 21I reports $(1.97 \pm 0.33 \pm 0.19) \times 10^{-5}$ from a measurement of $[\Gamma(\eta'(958) \rightarrow \pi^+\pi^-\mu^+\mu^-)/\Gamma_{\text{total}}] \times [B(J/\psi(15) \rightarrow \gamma\eta'(958))]$ assuming $B(J/\psi(15) \rightarrow \gamma\eta'(958)) = (5.21 \pm 0.17) \times 10^{-3}$, which we rescale to our best value $B(J/\psi(15) \rightarrow \gamma\eta'(958)) = (5.28 \pm 0.06) \times 10^{-3}$. Our first error is their experiment's error and our second error is the systematic error from using our best value.

2 Using $\Gamma_2/\Gamma = (29.3 \pm 0.6)%$ from PDG 12.

3 Not independent of measured value of $\Gamma_{10}/\Gamma_1$ from NAIK 09.

$$ \begin{array}{l} \frac{\Gamma(\pi^+ \pi^- \mu^+ \mu^-)}{\Gamma(\pi^+ \pi^- \eta)} \\ \frac{(\text{units } 10^{-3})}{\text{CL%}} \end{array} $$

<0.5 90 1 NAIK 09 CLEO J/ψ → γη'

$$ \begin{array}{l} \frac{\Gamma(\pi^+ \pi^- \mu^+ \mu^-)}{\Gamma(\rho^0\gamma(\text{including non-resonant } \pi^+ \pi^- \gamma))} \\ \frac{(\text{units } 10^{-4})}{\text{CL%}} \end{array} $$

<1.0 90 ABLIKIM 130 BES3 J/ψ → γη'

$$ \begin{array}{l} \frac{\Gamma(\pi^+ \pi^- \pi^0)}{\Gamma_{\text{total}}} \\ \frac{(\text{units } 10^{-3})}{\text{EVTS}} \end{array} $$

3.61 ± 0.18 **OUR FIT**

3.61 ± 0.18 **OUR AVERAGE**

3.591 ± 0.054 ± 0.174 6067 ABLIKIM 17 BES3 J/ψ → γ(π⁺π⁻π⁰)

4.28 ± 0.49 ± 1.11 78 1 ABLIKIM 15P BES3 J/ψ → K⁺K⁻3π

3.7 ± 1.1 ± 0.9 0.4 2 NAIK 09 CLEO J/ψ → γη'

• • • We do not use the following data for averages, fits, limits, etc. • • •

3.83 ± 0.15 ± 0.39 1014 3 ABLIKIM 12E BES3 J/ψ → γ(π⁺π⁻π⁰)

1 We have added all systematic uncertainties in quadrature to a single value.

2 Not independent of measured value of $\Gamma_{11}/\Gamma_1$ from NAIK 09.

3 Superseded by ABLIKIM 17.

$$ \begin{array}{l} \frac{\Gamma(\pi^+ \pi^- \pi^0)}{\Gamma(\pi^+ \pi^- \eta)} \\ \frac{(\text{units } 10^{-3})}{\text{EVTS}} \end{array} $$

8.5 ± 0.4 **OUR FIT** Error includes scale factor of 1.1.

8.27 +2.49 -2.12 ± 0.04 20 1 NAIK 09 CLEO J/ψ → γη'

1 NAIK 09 reports $[\Gamma(\eta'(958) \rightarrow \pi^+\pi^-\pi^0)/\Gamma(\eta'(958) \rightarrow \pi^+\pi^-\eta')] / [B(\eta \rightarrow 2\gamma)] = (21^{+6}_{-5} \pm 2) \times 10^{-3}$ which we multiply by our best value $B(\eta \rightarrow 2\gamma) = (39.36 \pm 0.18) \times 10^{-2}$. Our first error is their experiment's error and our second error is the systematic error from using our best value.

$$ \begin{array}{l} \frac{\Gamma((\pi^+ \pi^- \pi^0) \text{ S-wave})}{\Gamma_{\text{total}}} \\ \frac{(\text{units } 10^{-4})}{\text{EVTS}} \end{array} $$

1 We have added all systematic uncertainties in quadrature.

$$ \begin{array}{l} \frac{\Gamma(\pi^\mp \rho^\pm)}{\Gamma_{\text{total}}} \\ \frac{(\text{units } 10^{-4})}{\text{EVTS}} \end{array} $$

1 We have added all systematic uncertainties in quadrature.

$$ \begin{array}{l} \frac{\Gamma(2(\pi^+ \pi^-))}{\Gamma_{\text{total}}} \\ \frac{(\text{units } 10^{-5})}{\text{CL%}} \end{array} $$

• • • We do not use the following data for averages, fits, limits, etc. • • •

< 24 90 2 NAIK 09 CLEO J/ψ → γη'

<1000 90 RITTENBERG 69 HBC 1.7-2.7 K⁻p

1 ABLIKIM 14M reports $[\Gamma(\eta'(958) \rightarrow 2(\pi^+\pi^-))/\Gamma_{\text{total}}] \times [B(J/\psi(15) \rightarrow \gamma\eta'(958))] = (4.40 \pm 0.35 \pm 0.30) \times 10^{-7}$ which we divide by our best value $B(J/\psi(15) \rightarrow \gamma\eta'(958)) = (5.28 \pm 0.06) \times 10^{-3}$. Our first error is their experiment's error and our second error is the systematic error from using our best value.

2 Not independent of measured value of $\Gamma_{14}/\Gamma_1$ from NAIK 09.

$$ \begin{array}{l} \frac{\Gamma(2(\pi^+ \pi^-))}{\Gamma(\pi^+ \pi^- \eta)} \\ \frac{(\text{units } 10^{-3})}{\text{CL%}} \end{array} $$

<0.6 90 1 NAIK 09 CLEO J/ψ → γη'
$$ \Gamma(\pi^+\pi^- 2\pi^0)/\Gamma_{\text{total}} \qquad \Gamma_{15}/\Gamma $$

<table><thead><tr><th>VALUE (units 10<sup>-4</sup>)</th><th>CL%</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>1.78±0.38±0.02</td><td>84</td><td></td><td>1 ABLIKIM</td><td>14M</td><td>BES3<br>J/ψ → γη'</td></tr></tbody></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>&lt;27</td><td>90</td><td>2 NAIK</td><td>09</td><td>CLEO</td><td>J/ψ → γη'</td></tr></table>

¹ ABLIKIM 14M reports $[\Gamma(\eta'(958) \rightarrow \pi^+\pi^- 2\pi^0)/\Gamma_{\text{total}}] \times [B(J/\psi(15) \rightarrow \gamma\eta'(958))] = (9.38 \pm 1.79 \pm 0.89) \times 10^{-7}$ which we divide by our best value $B(J/\psi(15) \rightarrow \gamma\eta'(958)) = (5.28 \pm 0.06) \times 10^{-3}$. Our first error is their experiment's error and our second error is the systematic error from using our best value.

² Not independent of measured value of $\Gamma_{15}/\Gamma_1$ from NAIK 09.

$$ \Gamma(\pi^+\pi^- 2\pi^0)/\Gamma(\pi^+\pi^- \eta) \qquad \Gamma_{15}/\Gamma_1 $$

<table><thead><tr><th>VALUE (units 10<sup>-3</sup>)</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;6</td><td>90</td><td>1 NAIK</td><td>09</td><td>CLEO<br>J/ψ → γη'</td></tr></tbody></table>

¹ NAIK 09 reports $[\Gamma(\eta'(958) \rightarrow \pi^+\pi^- 2\pi^0)/\Gamma(\eta'(958) \rightarrow \pi^+\pi^- \eta)] / [B(\eta \rightarrow 2\gamma)] < 15 \times 10^{-3}$ which we multiply by our best value $B(\eta \rightarrow 2\gamma) = 39.36 \times 10^{-2}$.

$$ \Gamma(2(\pi^+\pi^-)\text{ neutrals})/\Gamma_{\text{total}} \qquad \Gamma_{16}/\Gamma $$

<table><thead><tr><th>VALUE</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;0.01</td><td>95</td><td>DANBURG</td><td>73</td><td>HBC<br>2.2 K<sup>-</sup> p → ΛX<sup>0</sup></td></tr></tbody></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>&lt;0.01</td><td>90</td><td>RITTENBERG</td><td>69</td><td>HBC<br>1.7-2.7 K<sup>-</sup> p</td></tr></table>

$$ \Gamma(2(\pi^+\pi^-)\pi^0)/\Gamma_{\text{total}} \qquad \Gamma_{17}/\Gamma $$

<table><thead><tr><th>VALUE</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;0.002</td><td>90</td><td>1 NAIK</td><td>09</td><td>CLEO<br>J/ψ → γη'</td></tr><tr><td>&lt;0.01</td><td>90</td><td>RITTENBERG</td><td>69</td><td>HBC<br>1.7-2.7 K<sup>-</sup> p</td></tr></tbody></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>&lt;0.002</td><td>90</td><td>1 NAIK</td><td>09</td><td>CLEO<br>J/ψ → γη'</td></tr><tr><td>&lt;0.01</td><td>90</td><td>RITTENBERG</td><td>69</td><td>HBC<br>1.7-2.7 K<sup>-</sup> p</td></tr></table>

¹ Not independent of measured value of $\Gamma_{17}/\Gamma_1$ from NAIK 09.

$$ \Gamma(2(\pi^+\pi^-)\pi^0)/\Gamma(\pi^+\pi^- \eta) \qquad \Gamma_{17}/\Gamma_1 $$

<table><thead><tr><th>VALUE (units 10<sup>-3</sup>)</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;4</td><td>90</td><td>1 NAIK</td><td>09</td><td>CLEO<br>J/ψ → γη'</td></tr></tbody></table>

¹ NAIK 09 reports $[\Gamma(\eta'(958) \rightarrow 2(\pi^+\pi^-)\pi^0)/\Gamma(\eta'(958) \rightarrow \pi^+\pi^- \eta)] / [B(\eta \rightarrow 2\gamma)] < 11 \times 10^{-3}$ which we multiply by our best value $B(\eta \rightarrow 2\gamma) = 39.36 \times 10^{-2}$.

$$ \Gamma(2(\pi^+\pi^-)2\pi^0)/\Gamma_{\text{total}} \qquad \Gamma_{18}/\Gamma $$

<table><thead><tr><th>VALUE</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;0.01</td><td>95</td><td>KALBFLEISCH 64B</td><td>HBC<br>K<sup>-</sup> p → Λ2(π<sup>+</sup>π<sup>-</sup>) + MM</td><td></td></tr></tbody></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>&lt;0.01</td><td>90</td><td>LONDON</td><td>66</td><td>HBC<br>Compilation</td></tr></table>

$$ \Gamma(3(\pi^+\pi^-))/\Gamma_{\text{total}} \qquad \Gamma_{19}/\Gamma $$

<table><thead><tr><th>VALUE (units 10<sup>-5</sup>)</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt; 3.1</td><td>90</td><td>1 ABLIKIM</td><td>13u</td><td>BES3<br>J/ψ → γ3(π<sup>+</sup>π<sup>-</sup>)</td></tr></tbody></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>&lt; 53</td><td>90</td><td>2 NAIK</td><td>09</td><td>CLEO<br>J/ψ → γη'</td></tr><tr><td>&lt;500</td><td>95</td><td>KALBFLEISCH 64B</td><td>HBC<br>K<sup>-</sup> p → Λ2(π<sup>+</sup>π<sup>-</sup>)</td><td></td></tr></table>

¹ Using $B(J/\psi \rightarrow \gamma\eta'(958)) = (5.16 \pm 0.15) \times 10^{-3}$.

² Not independent of measured value of $\Gamma_{19}/\Gamma_1$ from NAIK 09.

$$ \Gamma(3(\pi^+\pi^-))/\Gamma(\pi^+\pi^- \eta) \qquad \Gamma_{19}/\Gamma_1 $$

<table><thead><tr><th>VALUE (units 10<sup>-3</sup>)</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;1.2</td><td>90</td><td>1 NAIK</td><td>09</td><td>CLEO<br>J/ψ → γη'</td></tr></tbody></table>

¹ NAIK 09 reports $[\Gamma(\eta'(958) \rightarrow 3(\pi^+\pi^-))/\Gamma(\eta'(958) \rightarrow \pi^+\pi^- \eta)] / [B(\eta \rightarrow 2\gamma)] < 3.0 \times 10^{-3}$ which we multiply by our best value $B(\eta \rightarrow 2\gamma) = 39.36 \times 10^{-2}$.

$$ \Gamma(K^{\pm}\pi^{\mp})/\Gamma(\rho^0\gamma \text{ (including non-resonant } \pi^+\pi^- \gamma)) \qquad \Gamma_{20}/\Gamma_2 $$

<table><thead><tr><th>VALUE</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;1.3 × 10<sup>-4</sup></td><td>90</td><td>ABLIKIM</td><td>16M</td><td>BES3<br>e<sup>+</sup>e<sup>-</sup> → J/ψ → hadrons</td></tr></tbody></table>

$$ \Gamma(\pi^+\pi^- e^+e^-)/\Gamma_{\text{total}} \qquad \Gamma_{21}/\Gamma $$

<table><thead><tr><th>VALUE (units 10<sup>-3</sup>)</th><th>CL%</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td colspan="6"><strong>2.42±0.10 OUR FIT</strong></td></tr></tbody></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>2.11±0.12±0.14</td><td>429</td><td>1 ABLIKIM</td><td>130</td><td>BES3<br>J/ψ → γη'</td></tr></table>

<table><tr><td>2.5 +1.2<br>-0.9 ± 0.5</td><td>2 NAIK</td><td>09</td><td>CLEO<br>J/ψ → γη'</td></tr></table>

<table><tr><td>&lt;6</td><td>90</td><td>RITTENBERG</td><td>65</td><td>HBC<br>2.7 K<sup>-</sup></td></tr></table>

¹ Using $\Gamma_2/\Gamma = (29.3 \pm 0.6)\%$ from PDG 12.

² Not independent of measured value of $\Gamma_{21}/\Gamma_1$ from NAIK 09.

$$ \Gamma(\pi^+\pi^- e^+e^-)/\Gamma(\pi^+\pi^- \eta) \qquad \Gamma_{21}/\Gamma_1 $$

<table><thead><tr><th>VALUE (units 10<sup>-3</sup>)</th><th>CL%</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>5.69±0.25 OUR FIT</td><td></td><td></td><td></td><td></td><td></td></tr></tbody></table>

<table><thead><tr><th>5.51 +3.00<br>-2.30 ±0.03</th><th>8</th><th>1 NAIK</th><th>09</th><th>CLEO<br>J/ψ → γη'</th></tr></thead><tbody></tbody></table>

¹ NAIK 09 reports $[\Gamma(\eta'(958) \rightarrow \pi^+\pi^- e^+e^-)/\Gamma(\eta'(958) \rightarrow \pi^+\pi^- \eta)] / [B(\eta \rightarrow 2\gamma)) = (14 + 7/5 \pm 3) \times 10^{-3}$ which we multiply by our best value $B(\eta \rightarrow 2\gamma) = (39.36 \pm 0.18) \times 10^{-2}$. Our first error is their experiment's error and our second error is the systematic error from using our best value.

$$ \Gamma(\pi^+\pi^- e^+e^-)/\Gamma(\rho^0\gamma \text{ (including non-resonant } \pi^+\pi^- \gamma)) \qquad \Gamma_{21}/\Gamma_2 $$

<table><thead><tr><th>VALUE (units 10<sup>-3</sup>)</th><th>CL%</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>8.20±0.31 OUR FIT</td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>8.20±0.16±0.27</td><td></td><td>2584</td><td>ABLIKIM</td><td>21J</td><td>BES3<br>J/ψ → γη'</td></tr></tbody></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>7.2 ± 0.4 ± 0.5</td><td>429</td><td>1 ABLIKIM</td><td>130</td><td>BES3<br>J/ψ → γη'</td></tr></table>

¹ Superseded by ABLIKIM 21J.

$$ \Gamma(\pi^+\pi^- \nu_e + \text{c.c.})/\Gamma(\pi^+\pi^- \eta) \qquad \Gamma_{22}/\Gamma_1 $$

<table><thead><tr><th>VALUE (units 10<sup>-4</sup>)</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;5.0</td><td>90</td><td>ABLIKIM</td><td>13G</td><td>BES3<br>J/ψ → φη'</td></tr></tbody></table>

$$ \Gamma(\gamma e^+e^-)/\Gamma_{\text{total}} \qquad \Gamma_{23}/\Gamma $$

<table><thead><tr><th>VALUE (units 10<sup>-3</sup>)</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;0.9</td><td>90</td><td>BRIERE</td><td>00</td><td>CLEO<br>10.6 e<sup>+</sup>e<sup>-</sup></td></tr></tbody></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>&lt;0.9</td><td>90</td><td>BRIERE</td><td>00</td><td>CLEO<br>10.6 e<sup>+</sup>e<sup>-</sup></td></tr></table>

$$ \Gamma(\gamma e^+e^-)/\Gamma(\gamma\gamma) \qquad \Gamma_{23}/\Gamma_7 $$

<table><thead><tr><th>VALUE (units 10<sup>-2</sup>)</th><th>CL%</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>2.13±0.09±0.07</td><td>864</td><td>ABLIKIM</td><td>150</td><td>BES3<br>J/ψ → γe<sup>+</sup>e<sup>-</sup></td></tr></tbody></table>

$$ \Gamma(\pi^0\gamma\gamma)/\Gamma_{\text{total}} \qquad \Gamma_{24}/\Gamma $$

<table><thead><tr><th>VALUE (units 10<sup>-3</sup>)</th><th>CL%</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>3.20±0.07±0.23</td><td>3.4k</td><td>ABLIKIM</td><td>17T</td><td>BES3<br>J/ψ → γη'</td></tr></tbody></table>

$$ \Gamma(\pi^0\gamma\gamma)/\Gamma(\pi^0\pi^0\eta) \qquad \Gamma_{24}/\Gamma_4 $$

<table><thead><tr><th>VALUE (units 10<sup>-4</sup>)</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;37</td><td>90</td><td>ALDE</td><td>87B</td><td>GAM2<br>38 π<sup>-</sup> p → n4γ</td></tr></tbody></table>

$$ \Gamma(\pi^0\gamma\gamma(\text{non resonant}))/\Gamma_{\text{total}} \qquad \Gamma_{25}/\Gamma $$

<table><thead><tr><th>VALUE (units 10<sup>-4</sup>)</th><th>CL%</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>6.16±0.64±0.67</td><td>655</td><td>ABLIKIM</td><td>17T</td><td>BES3<br>J/ψ → γη'</td></tr></tbody></table>

$$ \Gamma(\eta\gamma\gamma)/\Gamma_{\text{total}} \qquad \Gamma_{26}/\Gamma $$

<table><thead><tr><th>VALUE</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;1.33 × 10<sup>-4</sup></td><td>90</td><td>ABLIKIM</td><td>19AW</td><td>BES3<br>J/ψ → γη'<br>→ γγγ2γ</td></tr></tbody></table>

$$ \Gamma(4\pi^0)/\Gamma_{\text{total}} \qquad \Gamma_{27}/\Gamma $$

<table><thead><tr><th>VALUE</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;4.94 × 10<sup>-5</sup></td><td>90</td><td>ABLIKIM</td><td>20E</td><td>BES3<br>J/ψ → η'γ</td></tr></tbody></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>&lt;3.2 × 10<sup>-4</sup></td><td>90</td><td>DONSKOV</td><td>14</td><td>GAM4<br>32.5 π<sup>-</sup> p → η' n</td></tr></table>

$$ \Gamma(4\pi^0)/\Gamma(\pi^0\pi^0\eta) \qquad \Gamma_{27}/\Gamma_4 $$

<table><thead><tr><th>VALUE (units 10<sup>-4</sup>)</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;23</td><td>90</td><td>ALDE</td><td>87B</td><td>GAM2<br>38 π<sup>-</sup> p → n8γ</td></tr></tbody></table>

<table><tr><td>&lt;23</td><td>90</td><td>DONSKOV</td><td>14</td><td>GAM4<br>32.5 π<sup>-</sup> p → η' n</td></tr></table>

$$ \Gamma(e^+e^-)/\Gamma_{\text{total}} \qquad \Gamma_{28}/\Gamma $$

<table><thead><tr><th>VALUE</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt; 5.6 × 10<sup>-9</sup></td><td>90</td><td>1 ACHASOV</td><td>15</td><td>SND<br>0.958 e<sup>+</sup>e<sup>-</sup> → ππη</td></tr></tbody></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>&lt;12 × 10<sup>-9</sup></td><td>90</td><td>2 AKHMETSHIN 15</td><td>CMD3</td><td>0.958 e<sup>+</sup>e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>η</td></tr><tr><td>&lt; 2.1 × 10<sup>-7</sup></td><td>90</td><td>VOROBYEV 88</td><td>ND</td><td>e<sup>+</sup>e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>η</td></tr></table>

¹ Combining data of ACHASOV 15 and AKHMETSHIN 15 and using $\Gamma(\eta') = 0.198 \pm 0.009$ MeV.

² Using $\Gamma_{\eta'(958)} = 198 \pm 9$ keV, $B(\eta'(958) \rightarrow \pi^+\pi^- \eta) = (42.9 \pm 0.7)\%$, and $B(\eta \rightarrow \gamma\gamma) = (39.41 \pm 0.20)\%$.

$$ \Gamma(e^+e^- e^+e^-)/\Gamma_{\text{total}} \qquad \Gamma_{29}/\Gamma $$

<table><thead><tr><th>VALUE (units 10<sup>-6</sup>)</th><th>CL%</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>4.5±1.1±0.1</td><td>30</td><td>1 ABLIKIM</td><td>22E</td><td>BES3<br>J/ψ → γη'</td></tr></tbody></table>

¹ ABLIKIM 22E reports $(4.5 \pm 1.0 \pm 0.5) \times 10^{-6}$ from a measurement of $[\Gamma(\eta'(958) \rightarrow e^+e^- e^+e^-)/\Gamma_{\text{total}}] \times [B(J/\psi(15) \rightarrow \gamma\eta'(958))]$ assuming $B(J/\psi(15) \rightarrow \gamma\eta'(958)) = (5.25 \pm 0.07) \times 10^{-3}$, which we rescale to our best value $B(J/\psi(15) \rightarrow \gamma\eta'(958)) = (5.28 \pm 0.06) \times 10^{-3}$. Our first error is their experiment's error and our second error is the systematic error from using our best value.

$$ \Gamma(\text{invisible})/\Gamma_{\text{total}} \qquad \Gamma_{30}/\Gamma $$

<table><thead><tr><th>VALUE (units 10<sup>-4</sup>)</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;9.5</td><td>90</td><td>1 NAIK</td><td>09</td><td>CLEO<br>J/ψ → γη'</td></tr></tbody></table>

• • • We do not use the following data for averages, fits, limits, etc. • • •

<table><tr><td>&lt;2.1</td><td>90</td><td>1 NAIK</td><td>09</td><td>CLEO<br>J/ψ → γη'</td></tr></table>

¹ Not independent of measured value of $\Gamma_{30}/\Gamma_1$ from NAIK 09.

$$ \Gamma(\text{invisible})/\Gamma(\pi^+\pi^- \eta) \qquad \Gamma_{30}/\Gamma_1 $$

<table><thead><tr><th>VALUE (units 10<sup>-3</sup>)</th><th>CL%</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>&lt;2.1</td><td>90</td><td>1 NAIK</td><td>09</td><td>CLEO<br>J/ψ → γη'</td></tr></tbody></table>

<table><tr><td>&lt;2.1</td><td>90</td><td>1 NAIK</td><td>09</td><td>CLEO<br>J/ψ → γη'</td></tr></table>

¹ NAIK 09 reports $[\Gamma(\eta'(958) \rightarrow invisible)/\Gamma(\eta'(958) \rightarrow \pi^+\pi^- \eta)] / [B(\eta \rightarrow 2\gamma)] < 5.4 \times 10^{-3}$ which we multiply by our best value $B(\eta \rightarrow 2\gamma) = 39.36 \times 10^{-2}$.
# Meson Particle Listings

## η'(958)

### Γ(invisible)/Γ(γγ)

VALUE (units 10⁻⁴) CL%

<2.4 90

• • • We do not use the following data for averages, fits, limits, etc. • • •

<6.69 90

### Γ(π⁺π⁻)/Γ<sub>total</sub>

VALUE (units 10⁻⁴) CL%

< 0.18 90

• • • We do not use the following data for averages, fits, limits, etc. • • •

< 0.5 90

< 29 90

< 3.3 90

<800 95

<200 90

¹ Using branching fractions of $D_{(s)}^+$ decays from PDG 15.

² ABLIKIM 116 reports $[\Gamma(\eta'(958) \rightarrow \pi^+\pi^-)/\Gamma_{total}] \times [B(J/\psi(1S) \rightarrow \gamma\eta'(958))] < 2.84 \times 10^{-7}$ which we divide by our best value $B(J/\psi(1S) \rightarrow \gamma\eta'(958)) = 5.28 \times 10^{-7}$.

³ Taking into account interference with the $\gamma\gamma \rightarrow \pi^+\pi^-$ continuum.

⁴ Without interference with the $\gamma\gamma \rightarrow \pi^+\pi^-$ continuum.

### Γ(π⁰π⁰)/Γ<sub>total</sub>

VALUE CL%

<4 × 10⁻⁴ 90

¹ ABLIKIM 116 reports $[\Gamma(\eta'(958) \rightarrow \pi^+\pi^-)/\Gamma_{total}] \times [B(J/\psi(1S) \rightarrow \gamma\eta'(958))] < 2.84 \times 10^{-7}$ which we divide by our best value $B(J/\psi(1S) \rightarrow \gamma\eta'(958)) = 5.28 \times 10^{-7}$.

### Γ(π⁰π⁰)/Γ(π⁰π⁰η)

VALUE (units 10⁻⁴) CL%

<45 90

### Γ(π⁰e⁺e⁻)/Γ<sub>total</sub>

VALUE (units 10⁻³) CL%

< 1.4 90

• • • We do not use the following data for averages, fits, limits, etc. • • •

<13 90

### Γ(π⁰ρ⁰)/Γ<sub>total</sub>

VALUE CL%

<0.04 90

### Γ(ηe⁺e⁻)/Γ<sub>total</sub>

VALUE (units 10⁻³) CL%

< 2.4 90

• • • We do not use the following data for averages, fits, limits, etc. • • •

<11 90

### Γ(3γ)/Γ(π⁰π⁰η)

VALUE (units 10⁻⁴) CL%

<4.6 90

### Γ(μ⁺μ⁻π⁰)/Γ<sub>total</sub>

VALUE (units 10⁻⁵) CL%

<6.0 90

### Γ(μ⁺μ⁻η)/Γ<sub>total</sub>

VALUE (units 10⁻⁵) CL%

<1.5 90

### Γ(eμ)/Γ<sub>total</sub>

VALUE (units 10⁻⁴) CL%

<4.7 90

### Γ<sub>30</sub>/Γ<sub>7</sub>

### Γ<sub>31</sub>/Γ

### Γ<sub>32</sub>/Γ

### Γ<sub>32</sub>/Γ<sub>4</sub>

### Γ<sub>34</sub>/Γ

### Γ<sub>36</sub>/Γ<sub>4</sub>

### Γ<sub>37</sub>/Γ

### Γ<sub>38</sub>/Γ

### Γ<sub>39</sub>/Γ

-0.033 ± 0.005 ± 0.003 44k

-0.072 ± 0.012 ± 0.006 7k

-0.021 ± 0.018 ± 0.017 6.7k

-0.021 ± 0.018 ± 0.017 6.7k

-0.058 ± 0.013 ± 0.003 5.4k

-0.08 ± 0.03 4.5k

¹ See ABLIKIM 11 for the full correlation matrix.

² Superseded by DOROFEEV 07, which found this parameterization unacceptable. See below.

³ Assuming Im(α) = 0, C = 0, and D = 0.

⁴ Assuming C = 0.

⁵ From the data of DAUBER 64, RITTENBERG 69, AGUILAR-BENITEZ 72B, JACOBS 73, and DANBURG 73.

### Im(α) decay parameter

VALUE EVTS DOCUMENT ID TECN COMMENT

• • • We do not use the following data for averages, fits, limits, etc. • • •

0.000 ± 0.019 ± 0.001 351k ABLIKIM 18 BES3 $η' \rightarrow \eta\pi^+\pi^-$

0.000 ± 0.038 ± 0.002 56k ABLIKIM 18 BES3 $η' \rightarrow \eta\pi^0\pi^0$

0.000 ± 0.049 ± 0.001 44k 1 ABLIKIM 11 BES3 $J/\psi \rightarrow \gamma\eta\pi^+\pi^-$

0.0 ± 0.1 ± 0.0 7k 2 AMELIN 05A VES $28 \pi^- A \rightarrow \eta\pi^+\pi^-\pi^- A^*$

-0.00 ± 0.13 ± 0.00 5.4k 3 ALDE 86 GAM2 $38 \pi^- p \rightarrow n\eta\pi^0\pi^0$

0.0 ± 0.3 3,4 KALBFLEISCH 74 RVUE $η' \rightarrow \eta\pi^+\pi^-$

¹ See ABLIKIM 11 for the full correlation matrix.

² Superseded by DOROFEEV 07, which found this parameterization unacceptable. See below.

³ Assuming C = 0.

⁴ From the data of DAUBER 64, RITTENBERG 69, AGUILAR-BENITEZ 72B, JACOBS 73, and DANBURG 73.

### C decay parameter

VALUE EVTS DOCUMENT ID TECN COMMENT

• • • We do not use the following data for averages, fits, limits, etc. • • •

0.0027 ± 0.0024 ± 0.0015 351k ABLIKIM 18 BES3 $η' \rightarrow \eta\pi^+\pi^-$

0.018 ± 0.009 ± 0.003 44k 1 ABLIKIM 11 BES3 $J/\psi \rightarrow \gamma\eta\pi^+\pi^-$

0.020 ± 0.018 ± 0.004 7k 2 AMELIN 05A VES $28 \pi^- A \rightarrow \eta\pi^+\pi^-\pi^- A^*$

¹ See ABLIKIM 11 for the full correlation matrix.

² Superseded by DOROFEEV 07, which found this parameterization unacceptable. See below.

### D decay parameter

VALUE EVTS DOCUMENT ID TECN COMMENT

• • • We do not use the following data for averages, fits, limits, etc. • • •

-0.053 ± 0.004 ± 0.004 351k ABLIKIM 18 BES3 $η' \rightarrow \eta\pi^+\pi^-$

-0.061 ± 0.009 ± 0.005 56k ABLIKIM 18 BES3 $η' \rightarrow \eta\pi^0\pi^0$

-0.059 ± 0.012 ± 0.004 44k 1 ABLIKIM 11 BES3 $J/\psi \rightarrow \gamma\eta\pi^+\pi^-$

-0.066 ± 0.030 ± 0.015 7k 2 AMELIN 05A VES $28 \pi^- A \rightarrow \eta\pi^+\pi^-\pi^- A^*$

0.00 ± 0.03 ± 0.00 5.4k 3 ALDE 86 GAM2 $38 \pi^- p \rightarrow n\eta\pi^0\pi^0$

0 3,4 KALBFLEISCH 74 RVUE $η' \rightarrow \eta\pi^+\pi^-$

¹ See ABLIKIM 11 for the full correlation matrix.

² Superseded by DOROFEEV 07, which found this parameterization unacceptable. See below.

³ Assuming C = 0.

⁴ From the data of DAUBER 64, RITTENBERG 69, AGUILAR-BENITEZ 72B, JACOBS 73, and DANBURG 73.

## η'(958) → ηππ DECAY PARAMETERS

### |MATRIZ ELEMENT|^2 = |1 + αY|^2 + CX + DX²

X and Y are Dalitz variables; α is complex and C, and D are real-valued. Parameters C and D are not necessarily equal to c and d, respectively, in the generalized parameterization following this one. May be different for $η'(958) \rightarrow \eta\pi^+\pi^-$ and $η'(958) \rightarrow \eta\pi^0\pi^0$ decays. Because of different initial assumptions and strong correlations of the parameters we do not average the parameters in the section below.

### Re(α) decay parameter

VALUE EVTS DOCUMENT ID TECN COMMENT

• • • We do not use the following data for averages, fits, limits, etc. • • •

-0.034 ± 0.002 ± 0.002 351k ABLIKIM 18 BES3 $η' \rightarrow \eta\pi^+\pi^-$

-0.054 ± 0.004 ± 0.001 56k ABLIKIM 18 BES3 $η' \rightarrow \eta\pi^0\pi^0$

## η'(958) → ηππ DECAY PARAMETERS

### |MATRIZ ELEMENT|^2 ∝ 1 + aY + bY² + cX + dX²

X and Y are Dalitz variables and a, b, c, and d are real-valued parameters. May be different for $η'(958) \rightarrow \eta\pi^+\pi^-$ and $η'(958) \rightarrow \eta\pi^0\pi^0$ decays. We do not average measurements in the section below because parameter values from each experiment are strongly correlated.

### a decay parameter

VALUE EVTS DOCUMENT ID TECN COMMENT

• • • We do not use the following data for averages, fits, limits, etc. • • •

-0.077 ± 0.003 ± 0.001 1 ABLIKIM 23AH BES3 $η' \rightarrow \eta\pi^0\pi^0$

-0.056 ± 0.004 ± 0.002 351k ABLIKIM 18 BES3 $η' \rightarrow \eta\pi^+\pi^-$

-0.087 ± 0.009 ± 0.006 56k ABLIKIM 18 BES3 $η' \rightarrow \eta\pi^0\pi^0$

-0.074 ± 0.008 ± 0.006 124k ADLARSON 18A A2MM $η' \rightarrow \eta\pi^0\pi^0$

-0.072 ± 0.007 ± 0.008 2 GONZALEZ-S..18A RVUE $η' \rightarrow \eta\pi^0\pi^0$

-0.047 ± 0.011 ± 0.003 44k 3 ABLIKIM 11 BES3 $J/\psi \rightarrow \gamma\eta\pi^+\pi^-$

-0.066 ± 0.016 ± 0.003 15k 4 BLIK 09 GAM4 $32.5 \pi^- p \rightarrow \eta'\eta\pi^0\pi^0$

-0.127 ± 0.016 ± 0.008 20k 5 DOROFEEV 07 VES $27 \pi^- p \rightarrow \eta'\eta\pi^0\pi^0$

¹ Fit IV, ignoring noncupc terms. Supersedes ABLIKIM 18.

² Theoretical analysis of ADLARSON 18A using resonance chiral perturbation theory to one loop.

³ See ABLIKIM 11 for the full correlation matrix.

⁴ From $η' \rightarrow \eta\pi^0\pi^0$ decay.

⁵ From $η' \rightarrow \eta\pi^+\pi^-$ decay.
b decay parameter

<table><thead><tr><th>VALUE</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>• • •</td><td></td><td></td><td></td><td>We do not use the following data for averages, fits, limits, etc.</td></tr><tr><td>-0.066 ± 0.006 ± 0.001</td><td></td><td>1 ABLIKIM</td><td>23AH BES3</td><td>η' → ηπ<sup>0</sup>π<sup>0</sup></td></tr><tr><td>-0.049 ± 0.006 ± 0.006</td><td>351k</td><td>ABLIKIM</td><td>18 BES3</td><td>η' → ηπ<sup>+</sup>π<sup>-</sup></td></tr><tr><td>-0.073 ± 0.014 ± 0.005</td><td>56k</td><td>ABLIKIM</td><td>18 BES3</td><td>η' → ηπ<sup>0</sup>π<sup>0</sup></td></tr><tr><td>-0.063 ± 0.014 ± 0.005</td><td>124k</td><td>ADLARSON</td><td>18A A2MM</td><td>η' → ηπ<sup>0</sup>π<sup>0</sup></td></tr><tr><td>-0.052 ± 0.001 ± 0.002</td><td></td><td>2 GONZALEZ-S..18A</td><td>RVUE</td><td>η' → ηπ<sup>0</sup>π<sup>0</sup></td></tr><tr><td>-0.069 ± 0.019 ± 0.009</td><td>44k</td><td>3 ABLIKIM</td><td>11 BES3</td><td>J/ψ → γηπ<sup>+</sup>π<sup>-</sup></td></tr><tr><td>-0.063 ± 0.028 ± 0.004</td><td>15k</td><td>4 BLIK</td><td>09 GAM4</td><td>32.5 π<sup>-</sup> p → η' n</td></tr><tr><td>-0.106 ± 0.028 ± 0.014</td><td>20k</td><td>5 DOROFEEV</td><td>07 VES</td><td>27 π<sup>-</sup> p → η' n, π<sup>-</sup> A → η' π<sup>-</sup> A*</td></tr></tbody></table>

1. Fit IV, ignoring noncupc terms. Supersedes ABLIKIM 18.

2. Theoretical analysis of ADLARSON 18A using resonance chiral perturbation theory to one loop.

3. See ABLIKIM 11 for the full correlation matrix.

4. From $η' \to \eta\pi^0\pi^0$ decay.

5. From $η' \to \eta\pi^+\pi^-$ decay.

c decay parameter

<table><thead><tr><th>VALUE</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>• • •</td><td></td><td></td><td></td><td>We do not use the following data for averages, fits, limits, etc.</td></tr><tr><td>0.0027 ± 0.0024 ± 0.0018</td><td>351k</td><td>ABLIKIM</td><td>18 BES3</td><td>η' → ηπ<sup>+</sup>π<sup>-</sup></td></tr><tr><td>0.019 ± 0.011 ± 0.003</td><td>44k</td><td>1 ABLIKIM</td><td>11 BES3</td><td>J/ψ → γηπ<sup>+</sup>π<sup>-</sup></td></tr><tr><td>-0.107 ± 0.096 ± 0.003</td><td>15k</td><td>2 BLIK</td><td>09 GAM4</td><td>32.5 π<sup>-</sup> p → η' n</td></tr><tr><td>0.015 ± 0.011 ± 0.014</td><td>20k</td><td>3 DOROFEEV</td><td>07 VES</td><td>27 π<sup>-</sup> p → η' n, π<sup>-</sup> A → η' π<sup>-</sup> A*</td></tr></tbody></table>

1. See ABLIKIM 11 for the full correlation matrix.

2. From $η' \to \eta\pi^0\pi^0$ decay.

3. From $η' \to \eta\pi^+\pi^-$ decay.

d decay parameter

<table><thead><tr><th>VALUE</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>• • •</td><td></td><td></td><td></td><td>We do not use the following data for averages, fits, limits, etc.</td></tr><tr><td>-0.068 ± 0.004 ± 0.001</td><td></td><td>1 ABLIKIM</td><td>23AH BES3</td><td>η' → ηπ<sup>0</sup>π<sup>0</sup></td></tr><tr><td>-0.063 ± 0.004 ± 0.003</td><td>351k</td><td>ABLIKIM</td><td>18 BES3</td><td>η' → ηπ<sup>+</sup>π<sup>-</sup></td></tr><tr><td>-0.074 ± 0.009 ± 0.004</td><td>56k</td><td>ABLIKIM</td><td>18 BES3</td><td>η' → ηπ<sup>0</sup>π<sup>0</sup></td></tr><tr><td>-0.050 ± 0.009 ± 0.005</td><td>124k</td><td>ADLARSON</td><td>18A A2MM</td><td>η' → ηπ<sup>0</sup>π<sup>0</sup></td></tr><tr><td>-0.051 ± 0.008 ± 0.006</td><td></td><td>2 GONZALEZ-S..18A</td><td>RVUE</td><td>η' → ηπ<sup>0</sup>π<sup>0</sup></td></tr><tr><td>-0.073 ± 0.012 ± 0.003</td><td>44k</td><td>3 ABLIKIM</td><td>11 BES3</td><td>J/ψ → γηπ<sup>+</sup>π<sup>-</sup></td></tr><tr><td>0.018 ± 0.078 ± 0.006</td><td>15k</td><td>4 BLIK</td><td>09 GAM4</td><td>32.5 π<sup>-</sup> p → η' n</td></tr><tr><td>-0.082 ± 0.017 ± 0.008</td><td>20k</td><td>5 DOROFEEV</td><td>07 VES</td><td>27 π<sup>-</sup> p → η' n, π<sup>-</sup> A → η' π<sup>-</sup> A*</td></tr></tbody></table>

1. Fit IV, ignoring noncupc terms. Supersedes ABLIKIM 18.

2. Theoretical analysis of ADLARSON 18A using resonance chiral perturbation theory to one loop.

3. See ABLIKIM 11 for the full correlation matrix.

4. From $η' \to \eta\pi^0\pi^0$ decay. If $c \equiv 0$ from Bose-Einstein symmetry, $d = -0.067 \pm 0.020 \pm 0.003$.

5. From $η' \to \eta\pi^+\pi^-$ decay.

η'(958) β PARAMETER
$|\text{MATRIX ELEMENT}|^2 = (1 + 2\beta Z)$

See the "Note on η Decay Parameters" in our 1994 edition Physical Review D50 1173 (1994), p. 1454.

β decay parameter

<table><thead><tr><th>VALUE</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>-0.61 ± 0.08 OUR AVERAGE</td><td></td><td>Error includes scale factor of 1.2.</td><td></td><td></td></tr><tr><td>-0.640 ± 0.046 ± 0.047</td><td>1.8k</td><td>ABLIKIM</td><td>15G BES3</td><td>J/ψ → γ(π<sup>0</sup>π<sup>0</sup>π<sup>0</sup>)</td></tr><tr><td>-0.59 ± 0.18</td><td>235</td><td>BLIK</td><td>08 GAMS</td><td>32 π<sup>-</sup> p → η' n</td></tr><tr><td>-0.1 ± 0.3</td><td></td><td>ALDE</td><td>87B GAM2</td><td>38 π<sup>-</sup> p → n3π<sup>0</sup></td></tr></tbody></table>

η'(958) C-NONCONSERVING DECAY PARAMETER

See the note on η decay parameters in the Stable Particle Particle Listings for definition of this parameter.

DECAY ASYMMETRY PARAMETER FOR $π^+π^-$

<table><thead><tr><th>VALUE</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>-0.03 ± 0.04 OUR AVERAGE</td><td></td><td></td><td></td><td></td></tr><tr><td>-0.019 ± 0.056</td><td></td><td>AIHARA</td><td>87 TPC</td><td>2γ → π<sup>+</sup>π<sup>-</sup>γ</td></tr><tr><td>-0.069 ± 0.078</td><td>295</td><td>GRIGORIAN</td><td>75 STRC</td><td>2.1 π<sup>-</sup> p</td></tr><tr><td>0.00 ± 0.10</td><td>103</td><td>KALBFLEISCH</td><td>75 HBC</td><td>2.18 K<sup>-</sup> p → Λπ<sup>+</sup>π<sup>-</sup>γ</td></tr><tr><td>• • •</td><td></td><td></td><td></td><td>We do not use the following data for averages, fits, limits, etc.</td></tr><tr><td>0.07 ± 0.08</td><td>152</td><td>RITTENBERG</td><td>65</td><td>2.1-2.7 K<sup>-</sup> p</td></tr></tbody></table>

η'(958) → $γℓ^+ℓ^-$ TRANSITION FORM FACTOR SLOPE

Related to the effective virtual meson mass $\Lambda$, via slope $\approx \Lambda^{-2}$. See e.g. LANDS- BERG 85, eq. (3.8), for a detailed definition.

<table><thead><tr><th>VALUE (GeV<sup>-2</sup>)</th><th>EVTS</th><th>DOCUMENT ID</th><th>TECN</th><th>COMMENT</th></tr></thead><tbody><tr><td>1.62 ± 0.17 OUR AVERAGE</td><td></td><td></td><td></td><td></td></tr><tr><td>1.60 ± 0.17 ± 0.08</td><td>864</td><td>1 ABLIKIM</td><td>150 BES3</td><td>J/ψ → γe<sup>+</sup>e<sup>-</sup></td></tr><tr><td>1.7 ± 0.4</td><td>33</td><td>1 VIKTOROV</td><td>80</td><td>25.33 π<sup>-</sup> p → 2μγ</td></tr></tbody></table>

1. In the single-pole Ansatz where slope $= 1/(\Lambda^2 + \gamma^2)$ with $\Lambda, \gamma$ being a Breit-Wigner mass, width for the effective contributing vector meson.

η'(958) REFERENCES

<table><tbody><tr><td>ABLIKIM</td><td>23AH PRL 130 081901</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>22E PR D105 112010</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>21I PR D103 072006</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>21J PR D103 092005</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>20E PR D101 032001</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>19AW PR D100 052015</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>19T PRL 122 142002</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>18 PR D97 012003</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>18C PRL 120 242003</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ADLARSON</td><td>18A PRL 098 012001</td><td>P. Adlarson et al.</td><td>(A2 Collab. at MAMI)</td></tr><tr><td>GONZALEZ-S..</td><td>18A EPJ C78 758</td><td>S. Gonzalez-Solis, E. Passemar</td><td>(BEIJ, IND+)</td></tr><tr><td>AAIJ</td><td>17D PL B764 233</td><td>R. Aaij et al.</td><td>(LHCb Collab.)</td></tr><tr><td>ABLIKIM</td><td>17 PRL 118 012001</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>17T PR D96 012005</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>16M PR D93 072008</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>15AD PR D92 051101</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>15G PR D92 012014</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>150 PR D92 012001</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>15P PR D92 012007</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ACHASOV</td><td>15 PR D91 092010</td><td>M. N. Achasov et al.</td><td>(CMD-3 Collab.)</td></tr><tr><td>AKHMETSHIN</td><td>15 PL B740 273</td><td>R.R. Akhmetshin et al.</td><td>(CMD-3 Collab.)</td></tr><tr><td>PDG</td><td>15 RPP 2015 at pdg.bnl.gov</td><td></td><td>(PDG Collab.)</td></tr><tr><td>ABLIKIM</td><td>14M PRL 112 251801</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>DONSKOV</td><td>14 MPL A29 1450213</td><td>S. Donskov et al.</td><td>(GAMS-4π Collab.)</td></tr><tr><td>PDG</td><td>14 CP C38 070001</td><td>K. Olive et al.</td><td>(PDG Collab.)</td></tr><tr><td>PDG</td><td>14 PR D98 012009</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>13G PR D87 032006</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>130 PR D87 092011</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>13U PR D88 091502</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>12E PRL 108 182001</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>PDG</td><td>16M PR D91 010001</td><td>J. Beringer et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>11 PR D83 012003</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>ABLIKIM</td><td>11G PR D84 032006</td><td>M. Ablikim et al.</td><td>(BESIII Collab.)</td></tr><tr><td>CZERWINSKI</td><td>10 PR D10 122001</td><td>E. Czerwinski et al.</td><td>(COSY-11 Collab.)</td></tr><tr><td>BLIK</td><td>09 PAN 72 231</td><td>A.M. Blik et al.</td><td>(IHEP (Protvino))</td></tr><tr><td>NAIK</td><td>09 PL 102 061801</td><td>P. Naik et al.</td><td>(CLEO Collab.)</td></tr><tr><td>PEDLAR</td><td>09 PR D79 111101</td><td>T.K. Pedlar et al.</td><td>(CLEO Collab.)</td></tr><tr><td>BLIK</td><td>08 PAN 71 2124</td><td>A. Blik et al.</td><td>(GAMS-4π Collab.)</td></tr><tr><td>LIBBY</td><td>08 PRL 01 182002</td><td>J. Libby et al.</td><td>(CLEO Collab.)</td></tr><tr><td>WICHT</td><td>08 PL B662 323</td><td>J. Wicht et al.</td><td>(BELLE Collab.)</td></tr><tr><td>DOROFEEV</td><td>07 PL B651 22</td><td>V. Dorofeev et al.</td><td>(VES Collab.)</td></tr><tr><td>MORI</td><td>07A JPSJ 76 074102</td><td>T. Mori et al.</td><td>(BELLE Collab.)</td></tr><tr><td>ABLIKIM</td><td>06E PR D73 052008</td><td>M. Ablikim et al.</td><td>(BES Collab.)</td></tr><tr><td>ABLIKIM</td><td>06E PR D73 052002</td><td>M. Ablikim et al.</td><td>(BES Collab.)</td></tr><tr><td>05A</td><td>06M PAN 68 372</td><td>D.V. Amelin et al.</td><td>(VES Collab.)</td></tr><tr><td>AMSLER</td><td>04B EPJ C33 23</td><td>Translated from YAF 68 401</td><td>(Crystal Barrel Collab.)</td></tr><tr><td>BAI</td><td>04J ZH BAI et al.</td><td>C. Amsler et al.</td><td>(BES Collab.)</td></tr><tr><td>BRIERE</td><td>00 PRL 84 26</td><td>J.Z. Bai et al.</td><td>(BES Collab.)</td></tr><tr><td>ACCIARBI</td><td>98Q PL B414 399</td><td>R. Briere et al.</td><td>(CLEO Collab.)</td></tr><tr><td>BARBERIS</td><td>98C PL B440 225</td><td>M. Acciarri et al.</td><td>(L3 Collab.)</td></tr><tr><td>WURZINGER</td><td>98E PL B374 283</td><td>D. Barberis et al.</td><td>(WA 102 Collab.)</td></tr><tr><td>PDG</td><td>94 PL D50 1173</td><td>R. Wurzinger et al.</td><td>(BONN, ORSAY, SACL+)</td></tr><tr><td>AMSLER</td><td>93 PL D50 1173</td><td>L. Montanet et al.</td><td>(CERN, LBL, DOST+)</td></tr><tr><td>BLADIIDZE</td><td>94 PL D38 1535</td><td>C. Amsler et al.</td><td>(Crystal Barrel Collab.)</td></tr><tr><td>BLADIIDZE</td><td>92C SJNP 55 1535</td><td>G.M. Beladizde, S.I. Bityukov, G.V. Borisov</td><td>(SERP+)</td></tr><tr><td>KARCH</td><td>92 ZPHY C54 33</td><td>Translated from YAF 55 2748.</td><td>(Crystal Ball Collab.)</td></tr><tr><td>ARMSTRONG</td><td>91B ZPHY C52 389</td><td>K. Karch et al.</td><td>(ATHU, BARI, BIRM+)</td></tr><tr><td>BEHREND</td><td>91 ZPHY C49 401</td><td>H.J. Behrend et al.</td><td>(CELLO Collab.)</td></tr><tr><td>AUGUSTIN</td><td>90 PR D42 10</td><td>J.E. Augustin et al.</td><td>(DM2 Collab.)</td></tr><tr><td>BARU</td><td>90 ZPHY C48 581</td><td>S.E. Baru et al.</td><td>(MD-1 Collab.)</td></tr><tr><td>BUTLER</td><td>90 PR D42 1368</td><td>F. Butler et al.</td><td>(Mark II Collab.)</td></tr><tr><td>KARCH</td><td>90 PL B249 353</td><td>K. Karch et al.</td><td>(Crystal Ball Collab.)</td></tr><tr><td>ROE</td><td>90 PR D41 17</td><td>N.A. Roe et al.</td><td>(ASP Collab.)</td></tr><tr><td>AIHARA</td><td>88C PR D38 1</td><td>H. Aihara et al.</td><td>(TPC-2γ Collab.)</td></tr><tr><td>VOROBYEV</td><td>88 SJNP 48 273</td><td>P.V. Vorobiev et al.</td><td>(NOVO)</td></tr><tr><td>WILLIAMS</td><td>88 Translated from YAF 48 436.</td><td>D.A. Williams et al.</td><td>(Crystal Ball Collab.)</td></tr><tr><td>AIHARA</td><td>87 PR D35 2650</td><td>H. Aihara et al.</td><td>(TPC-2γ Collab.) JP</td></tr><tr><td>ALBRECHT</td><td>87B PL P199 457</td><td>H. Albrecht et al.</td><td>(ARGUS Collab.)</td></tr><tr><td>ALDE</td><td>87B ZPHY C36 603</td><td>D.M. Alde et al.</td><td>(LANL, BELG, SERP, LAPP)</td></tr><tr><td>ANTREASYAN</td><td>87B PR D36 2633</td><td>D. Antreasyan et al.</td><td>(Crystal Ball Collab.)</td></tr><tr><td>GIDAL</td><td>87 PR D51 59 2012</td><td>G. Gidal et al.</td><td>(SLAC, HARY)</td></tr><tr><td>ALTE</td><td>86 PL B177 115</td><td>D.M. Alde et al.</td><td>(SERP, BELG, LANL, LAPP)</td></tr><tr><td>BARTEL</td><td>85E PL 160B 421</td><td>W. Bartel et al.</td><td>(JADE Collab.)</td></tr><tr><td>LANDSBERG</td><td>85 PRPL 128 301</td><td>L.G. Landsberg</td><td>(SERP)</td></tr><tr><td>ALTHOFF</td><td>84E PL 147B 487</td><td>M. Althoff et al.</td><td>(TASSO Collab.)</td></tr><tr><td>BERGER</td><td>84B PL 142B 125</td><td>C. Berger</td><td>(PLUTO Collab.)</td></tr><tr><td>ALBEG, LAPP</td><td>84J PL D19 264</td><td>F. G. Binon et al.</td><td>(SERP, BELG, LAPP+)</td></tr><tr><td>JENNI</td><td>83 PL D27 1031</td><td>P. Jenni et al.</td><td>(SLAC, LBL)</td></tr><tr><td>BARTEL</td><td>82B PL 113B 190</td><td>W. Bartel et al.</td><td>(JADE Collab.)</td></tr><tr><td>BEHREND</td><td>82C PL 114B 378</td><td>H.J. Behrend et al.</td><td>(CELLO Collab.)</td></tr><tr><td>ALDE</td><td>82 PL 125B 518 (erratum.)</td><td>R.N. Dzheladyin et al.</td><td>(SERP)</td></tr><tr><td>DZHALYADIN</td><td>81 PL 105B 239</td><td>R. N. Stanton et al.</td><td>(OSU, CARL, MCGI+)</td></tr><tr><td>STANTON</td><td>80 PL B92 353</td><td>V.A. Viktorov et al.</td><td>(SERP)</td></tr><tr><td>VIKTOROV</td><td>80 SJNP 32 520</td><td>Translated from YAF 32 1005.</td><td>(SERP)</td></tr><tr><td>APEL</td><td>79 PL 83B 131</td><td>W.D. Apel, K.H. Augenstein, E. Bertolucci</td><td>(KARLK+)</td></tr><tr><td>BINNIE</td><td>79 PL 83B 141</td><td>D.M. Binnie et al.</td><td>(LOIC)</td></tr><tr><td>ZANFINO</td><td>79 PL 38B 930</td><td>C. Zanfino et al.</td><td>(CARL, MCGI, OHIO+)</td></tr><tr><td>GRIGORIAN</td><td>75 NP B91 232</td><td>A. Grigorian et al.</td><td>(+)</td></tr><tr><td>KALBFLEISCH</td><td>75 PR D11 987</td><td>G.R. Kalbfleisch, R.C. Strand, J.W. Chapman</td><td>(BNL+)</td></tr><tr><td>DUANE</td><td>74 PL D12 425</td><td>A. Duane et al.</td><td>(LOIC, SHMP)</td></tr><tr><td>KALBFLEISCH</td><td>74 PR D19 916</td><td>G.R. Kalbfleisch</td><td>(BNL)</td></tr><tr><td>DANBURG</td><td>73 PR D8 3744</td><td>J.S. Danburg et al.</td><td>(BNL, MICH) JP</td></tr><tr><td>JACOBS</td><td>73 PR D8 18</td><td>S.M. Jacobs et al.</td><td>(BRAN, UMD, SYRA+)</td></tr><tr><td>AGUILAR-...</td><td>72B PR D6 29</td><td>M. Aguilar-Benitez et al.</td><td>(BNL)</td></tr><tr><td>APEL</td><td>72 PL 40B 680</td><td>W.D. Apel et al.</td><td>(KARLK, KARLE, PISA)</td></tr><tr><td>DALPIAZ</td><td>72 PL D13 377</td><td>P.F. Dalpiaz et al.</td><td>(CERN)</td></tr><tr><td>BASILE</td><td>71 NC A3 371</td><td>M. Basile et al.</td><td>(CERN, BGN, STRB)</td></tr><tr><td>HARVEY</td><td>71 PL 27 885</td><td>E.H. Harvey et al.</td><td>(MINN, MICH)</td></tr><tr><td>BENSINGER</td><td>70 PL 27 505</td><td>J.R. Bensinger et al.</td><td>(WISC)</td></tr><tr><td>RIITENBERG</td><td>69 Thesis UCRL 18863</td><td>A. Rittenberg</td><td>(LRL) I</td></tr><tr><td>DAVIS</td><td>68 PL 27B 532</td><td>R. Davis et al.</td><td>(NWES, ANL)</td></tr><tr><td>LONDON</td><td>66 PL 143 1034</td><td>G.W. London et al.</td><td>(BNL, SYRA+ UP)</td></tr><tr><td>BADIER</td><td>65B PL 17 337</td><td>J. Badier et al.</td><td>(EPOL, SACL, AMST)</td></tr><tr><td>RITTENBERG</td><td>65 PL 15 556</td><td>A. Rittenberg, G.R. Kalbfleisch</td><td>(LRL, LBL)</td></tr><tr><td>DAUBER</td><td>64 PL 13 449</td><td>P.M. Dauer et al.</td><td>(UCLA) JP</td></tr><tr><td>KALBFLEISCH</td><td>64B PL 13 349</td><td>G.R. Kalbfleisch, O.I. Dahl, A. Rittenberg</td><td>(LRL) JP</td></tr></tbody></table>