Observation of a K̄ NN bound state in the He 3 (K-, Λp)n reaction OBSERVATION of A K̄ NN BOUND STATE ... T. YAMAGA et al.
(2020) In Physical Review C 102(4).- Abstract
- We have performed an exclusive measurement of the K-+He3→Λpn reaction at an incident kaon momentum of 1GeV/c. In the Λp invariant mass spectrum, a clear peak was observed below the mass threshold of K̄+N+N, as a signal of the kaonic nuclear bound state, K̄NN. The binding energy, decay width, and S-wave Gaussian reaction form factor of this state were observed to be BK=42±3(stat.)-4+3(syst.)MeV, ΓK=100±7(stat.)-9+19(syst.)MeV, and QK=383±11(stat.)-1+4(syst.)MeV/c, respectively. The total production cross section of K̄NN, determined by its Λp decay mode, was σKtotBRΛp=9.3±0.8(stat.)-1.0+1.4(syst.)μb. We estimated the branching ratio of the K̄NN state to the Λp and ς0p decay modes as BRΛp/BRς0p∼1.7, by assuming that the physical processes... (More)
- We have performed an exclusive measurement of the K-+He3→Λpn reaction at an incident kaon momentum of 1GeV/c. In the Λp invariant mass spectrum, a clear peak was observed below the mass threshold of K̄+N+N, as a signal of the kaonic nuclear bound state, K̄NN. The binding energy, decay width, and S-wave Gaussian reaction form factor of this state were observed to be BK=42±3(stat.)-4+3(syst.)MeV, ΓK=100±7(stat.)-9+19(syst.)MeV, and QK=383±11(stat.)-1+4(syst.)MeV/c, respectively. The total production cross section of K̄NN, determined by its Λp decay mode, was σKtotBRΛp=9.3±0.8(stat.)-1.0+1.4(syst.)μb. We estimated the branching ratio of the K̄NN state to the Λp and ς0p decay modes as BRΛp/BRς0p∼1.7, by assuming that the physical processes leading to the ςNN final states are analogous to those of Λpn. © 2020 American Physical Society. (Less)
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- author
- Yamaga, T. ; Tatsuno, Hideyuki LU and Zmeskal, J.
- author collaboration
- organization
- publishing date
- 2020
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review C
- volume
- 102
- issue
- 4
- article number
- 044002
- publisher
- American Physical Society
- external identifiers
-
- scopus:85094168451
- ISSN
- 2469-9985
- DOI
- 10.1103/PhysRevC.102.044002
- language
- English
- LU publication?
- yes
- id
- 56d3ab0a-408c-45d8-b593-998f9d261360
- date added to LUP
- 2020-11-06 10:02:26
- date last changed
- 2023-12-04 23:24:30
@article{56d3ab0a-408c-45d8-b593-998f9d261360,
abstract = {{We have performed an exclusive measurement of the K-+He3→Λpn reaction at an incident kaon momentum of 1GeV/c. In the Λp invariant mass spectrum, a clear peak was observed below the mass threshold of K̄+N+N, as a signal of the kaonic nuclear bound state, K̄NN. The binding energy, decay width, and S-wave Gaussian reaction form factor of this state were observed to be BK=42±3(stat.)-4+3(syst.)MeV, ΓK=100±7(stat.)-9+19(syst.)MeV, and QK=383±11(stat.)-1+4(syst.)MeV/c, respectively. The total production cross section of K̄NN, determined by its Λp decay mode, was σKtotBRΛp=9.3±0.8(stat.)-1.0+1.4(syst.)μb. We estimated the branching ratio of the K̄NN state to the Λp and ς0p decay modes as BRΛp/BRς0p∼1.7, by assuming that the physical processes leading to the ςNN final states are analogous to those of Λpn. © 2020 American Physical Society.}},
author = {{Yamaga, T. and Tatsuno, Hideyuki and Zmeskal, J.}},
issn = {{2469-9985}},
language = {{eng}},
number = {{4}},
publisher = {{American Physical Society}},
series = {{Physical Review C}},
title = {{Observation of a K̄ NN bound state in the He 3 (K-, Λp)n reaction OBSERVATION of A K̄ NN BOUND STATE ... T. YAMAGA et al.}},
url = {{http://dx.doi.org/10.1103/PhysRevC.102.044002}},
doi = {{10.1103/PhysRevC.102.044002}},
volume = {{102}},
year = {{2020}},
}