Citation: S. Navas et al. (Particle Data Group), Phys. Rev. D 110, 030001 (2024)

I G (J PC ) = 0+ (0 − + )ηb (2S)OMITTED FROM SUMMARY TABLE
Quantum numbers shown are quark-model predictions.

ηb (2S) MASSVALUE (MeV)

EVTS+ 2.8
9999.0± 3.5 −1.926k

DOCUMENT ID

1 MIZUKTECNCOMMENTe + e − → γ π+ π− +hadrons• • • We do not use the following data for averages, fits, limits, etc. • • •9974.6± 2.3 ± 2.1
11 ± 4 2,3,4 DOBBS
12
Υ(2S) → γ hadrons
12BELL

1 Assuming Γηb (2S) = 4.9 MeV. Not independent of the corresponding mass difference
measurement.
2 SANDILYA 13 (Belle Collab.) search for such a state reconstructed in the same 26
exclusive hadronic final states as DOBBS 12 using a sample of (157.8 ± 3.6)×106 Υ(2S)
decays or about 17 times larger and find no evidence for a signal.
P Their 90% C.L.
upper limit on the branching fraction B(Υ(2S) → ηb (2S) γ) × i B(ηb (2S) → Xi )< 4.9 × 10−6 , summed over the exclusive hadronic final states Xi , is an order ofmagnitude smaller than that reported by DOBBS 12.
3 Obtained by analyzing CLEO III data but not authored by the CLEO Collaboration.
4 Assuming Γηb (2S) = 5 MeV. Not independent of the corresponding mass difference
measurement.

m Υ(2S) − m ηb (2S)
VALUE (MeV)

EVTS+ 2.824.3± 3.5 −1.926k

DOCUMENT ID

5 MIZUKTECNCOMMENTe + e − → γ π+ π− +hadrons• • • We do not use the following data for averages, fits, limits, etc. • • •48.7± 2.3 ± 2.1
11 ± 4 6,7,8 DOBBS
12Υ(2S) → γ hadrons
12BELL5 Assuming Γηb (2S) = 4.9 MeV. Not independent of the corresponding mass measurement.
6 SANDILYA 13 (Belle Collab.) search for such a state reconstructed in the same 26
exclusive hadronic final states as DOBBS 12 using a sample of (157.8 ± 3.6)×106 Υ(2S)
decays or about 17 times larger and find no evidence for a signal.
P Their 90% C.L.
upper limit on the branching fraction B(Υ(2S) → ηb (2S) γ) × i B(ηb (2S) → Xi )< 4.9 × 10−6 , summed over the exclusive hadronic final states Xi , is an order ofmagnitude smaller than that reported by DOBBS 12.
7 Obtained by analyzing CLEO III data but not authored by the CLEO Collaboration.
8 Assuming Γη (2S) = 5 MeV. Not independent of the corresponding mass measurement.
bηb (2S) WIDTHVALUE (MeV)

CL%

DOCUMENT ID

<2490

MIZUK

https://pdg.lbl.gov

Page 1

12TECNCOMMENT

BELL

e + e − → γ π + π − hadrons

Created: 5/31/2024 10:15

Citation: S. Navas et al. (Particle Data Group), Phys. Rev. D 110, 030001 (2024)ηb (2S) DECAY MODES

Γ1ModeFraction (Γi /Γ)hadronsseen

ηb (2S) BRANCHING RATIOSΓ hadrons /Γtotal
VALUE

Γ1 /Γ
EVTS

DOCUMENT ID

TECNCOMMENT

seen
26k
MIZUK
12 BELL e + e − → γ π + π − hadrons• • • We do not use the following data for averages, fits, limits, etc. • • •9,10 DOBBS
seen
12
Υ(2S) → γ hadrons
9 SANDILYA 13 (Belle Collab.) search for such a state reconstructed in the same 26
exclusive hadronic final states as DOBBS 12 using a sample of (157.8 ± 3.6)×106 Υ(2S)
decays or about 17 times larger and find no evidence for a signal.
P Their 90% C.L.
upper limit on the branching fraction B(Υ(2S) → ηb (2S) γ) × i B(ηb (2S) → Xi )< 4.9 × 10−6 , summed over the exclusive hadronic final states Xi , is an order ofmagnitude smaller than that reported by DOBBS 12.
10 Obtained by analyzing CLEO III data but not authored by the CLEO Collaboration.

ηb (2S) REFERENCES
SANDILYADOBBSMIZUK131212

PRL 111 112001
PRL 109 082001
PRL 109 232002

https://pdg.lbl.gov

S. Sandilya et al.
S. Dobbs et al.
R. Mizuk et al.

Page 2(BELLE Collab.)(BELLE Collab.)

Created: 5/31/2024 10:15