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

I (J P ) = 1( 21 − ) Status:

Σ (1620) 1/2−

∗OMITTED FROM SUMMARY TABLEThe S11 state at 1697 MeV reported by VANHORN 75 is tentatively
listed under the Σ (1750). CARROLL 76 sees two bumps in theisospin-1 total cross section near this mass. GAO 12 sees no evidence
for this resonance.
Production experiments are listed separately in the next entry.

Σ (1620) POLE POSITIONREAL PARTVALUE (MeV)

DOCUMENT ID

TECNCOMMENT

1680± 8SARANTSEV 19 DPWA K N multichannel• • • We do not use the following data for averages, fits, limits, etc. • • •1501

ZHANG

13A DPWA K N multichannel−2×IMAGINARY PARTVALUE (MeV)

DOCUMENT ID

TECNCOMMENT39± 11SARANTSEV 19 DPWA K N multichannel• • • We do not use the following data for averages, fits, limits, etc. • • •
171

ZHANG

13A DPWA K N multichannel

Σ (1620) POLE RESIDUE
The “normalized residue” is the residue divided by Γpole /2.

Normalized residue in N K → Σ (1620) → Σ πMODULUS

PHASE (◦ )DOCUMENT ID

0.14± 0.03

− 90 ± 25

SARANTSEVTECN

19COMMENTDPWA K N multichannel

Normalized residue in N K → Σ (1620) → Λ π
MODULUSPHASE (◦ )DOCUMENT ID

0.10± 0.03

75 ± 20SARANTSEVTECN

19COMMENTDPWA K N multichannel

Normalized residue in N K → Σ (1620) → Ξ K
MODULUSPHASE (◦ )DOCUMENT ID

0.02± 0.01

120 ± 20SARANTSEVTECN

19COMMENTDPWA K N multichannel

Normalized residue in N K → Σ (1620) → Λ(1520)π
MODULUSPHASE (◦ )DOCUMENT ID

0.12± 0.05

140 ± 40SARANTSEVTECN

19COMMENTDPWA K N multichannel

Normalized residue in N K → Σ (1620) → Σ (1385)π
MODULUSPHASE (◦ )DOCUMENT ID

0.015± 0.010

155 ± 40SARANTSEV

https://pdg.lbl.gov

Page 1TECN

19COMMENTDPWA K N multichannel

Created: 5/31/2024 10:12

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

Normalized residue in N K → Σ (1620) → N K ∗ (892), S-wave
MODULUSPHASE (◦ )0.05± 0.04

DOCUMENT ID

SARANTSEVTECN

19COMMENTDPWA K N multichannel

Normalized residue in N K → Σ (1620) → N K ∗ (892), D-wave
MODULUSPHASE (◦ )0.01± 0.01

DOCUMENT ID

SARANTSEVTECN

19COMMENTDPWA K N multichannel

Normalized residue in N K → Σ (1620) → N K
VALUE

DOCUMENT ID

0.11+-0.03@43+-20

SARANTSEV

TECN

19

COMMENTDPWA K N multichannel

Σ (1620) MASSVALUE (MeV)

DOCUMENT ID

TECNCOMMENT

1600 to 1650 (≈ 1620) OUR ESTIMATE
1681± 6SARANTSEV 19 DPWA K N multichannel
1600± 15ZHANG
13A DPWA K N multichannel
1 MORRIS
1600± 678 DPWA K − n → Λ π −2 CARROLL
1608± 576 DPWA Isospin-1 total σ1630± 10LANGBEIN
72 IPWA K N multichannel
1620
KIM
71 DPWA K-matrix analysis• • • We do not use the following data for averages, fits, limits, etc. • • •3 CARROLL
1633± 1076 DPWA Isospin-1 total σΣ (1620) WIDTHVALUE (MeV)

DOCUMENT ID

TECNCOMMENT

40 to 100 (≈ 70) OUR ESTIMATE
40± 12SARANTSEV 19 DPWA K N multichannel
400± 152
ZHANG
13A DPWA K N multichannel
1 MORRIS
87± 1978 DPWA K − n → Λ π −2 CARROLL
1576 DPWA Isospin-1 total σ
65± 20LANGBEIN
72 IPWA K N multichannel
40KIM
71 DPWA K-matrix analysis• • • We do not use the following data for averages, fits, limits, etc. • • •3 CARROLL
1076 DPWA Isospin-1 total σΣ (1620) DECAY MODES

Γ1
Γ2
Γ3
Γ4
Γ5
Γ6ModeFraction (Γi /Γ)

NK
Λπ
Σπ
ΞK
Λ(1520)πΣ (1385)π0.10 to 0.60

https://pdg.lbl.gov( 9.0 ± 3.0) %(17 ± 5 ) %(10Page 2±5 ) %Created: 5/31/2024 10:12

Citation: S. Navas et al. (Particle Data Group), Phys. Rev. D 110, 030001 (2024)Σ (1620) BRANCHING RATIOSΓ N K /Γtotal

Γ1 /Γ

VALUE

DOCUMENT ID

0.10 to 0.60 OUR ESTIMATE
0.11± 0.03
0.59± 0.10
0.22± 0.02
0.05

SARANTSEVZHANGLANGBEIN
KIM

TECN

1913A
7271

COMMENTDPWA K N multichannel
DPWA K N multichannel
IPWA K N multichannel
DPWA K-matrix analysisΓ Σ π /Γtotal

Γ3 /Γ

VALUE

DOCUMENT ID

0.17± 0.05

SARANTSEVTECN

19COMMENTDPWA K N multichannelΓ Λ π /Γtotal

Γ2 /ΓVALUEDOCUMENT ID

0.09± 0.03

SARANTSEV

TECN

19

COMMENTDPWA K N multichannelΓ Ξ K /Γtotal

Γ4 /Γ

VALUE

DOCUMENT ID∼0SARANTSEVTECN

19COMMENTDPWA K N multichannelΓ Λ(1520)π /Γtotal

Γ5 /Γ

VALUE

DOCUMENT ID

0.10± 0.05

SARANTSEV

TECN

19

COMMENTDPWA K N multichannelΓ Σ (1385)π /Γtotal

Γ6 /Γ

VALUE

DOCUMENT ID<0.01

SARANTSEV

TECN

19

COMMENTDPWA K N multichannel

1/(Γi Γf ) 2 /Γtotal in N K → Σ (1620) → Λ π
VALUE

0.12± 0.02
not seen0.151/(Γ1 Γ2 ) 2 /ΓDOCUMENT ID

1 MORRISBAILLON
KIM

TECN

787571COMMENTDPWA K − n → Λ π −IPWA K N → Λ π
DPWA K-matrix analysis

1/(Γi Γf ) 2 /Γtotal in N K → Σ (1620) → Σ π
VALUE

DOCUMENT ID+ 0.32± 0.03
not seen+ 0.40± 0.06
+ 0.08ZHANG
HEPP
LANGBEIN
KIM

1/(Γ1 Γ3 ) 2 /Γ
TECN

13A
76B
7271

COMMENTDPWA Multichannel
DPWA K − N → Σ π
IPWA K N multichannel
DPWA K-matrix analysis

Σ (1620) FOOTNOTES
1 MORRIS 78 obtains an equally good fit without including this resonance.
2 Total cross-section bump with (J+1/2) Γ / Γeltotal is 0.06 seen by CARROLL 76.
3 Total cross-section bump with (J+1/2) Γ / Γeltotal is 0.04 seen by CARROLL 76.

https://pdg.lbl.gov

Page 3Created: 5/31/2024 10:12

Citation: S. Navas et al. (Particle Data Group), Phys. Rev. D 110, 030001 (2024)Σ (1620) REFERENCESSARANTSEV 19
EPJ A55 180
ZHANG
13A PR C88 035205
GAO
12
PR C86 025201
AlsoNP A867 41
MORRIS78
PR D17 55CARROLL76
PRL 37 806
HEPP
76B PL 65B 487
BAILLON75
NP B94 39
VANHORN75
NP B87 145
Also
NP B87 157
LANGBEIN72
NP B47 477
KIM71
PRL 27 356
Also
Duke Conf. 161
Hyperon Resonances, 1970

https://pdg.lbl.gov

A.V. Sarantsev et al.
H. Zhang et al.
P. Gao, J. Shi, B.S. Zou
P. Gao, B.S. Zou, A. Sibirtsev
W.A. Morris et al.
A.S. Carroll et al.
V. Hepp et al.
P.H. Baillon, P.J. Litchfield
A.J. van Horn
A.J. van Horn
W. Langbein, F. Wagner
J.K. Kim
J.K. Kim

Page 4(BONN, PNPI)(KSU)(BHEP, BEIJT)(BHEP, BEIJT+)(FSU) IJP
(BNL) I(CERN, HEIDH, MPIM) IJP(CERN, RHEL) IJP(LBL) IJP
(LBL) IJP(MPIM) IJP(HARV) IJP(HARV) IJP

Created: 5/31/2024 10:12