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Measurement of the mesonic decay branch of the K̄ NN quasibound state

Yamaga, T. ; Tatsuno, H. LU and Zmeskal, J. (2024) In Physical Review C 110(1).
Abstract
We conducted measurements of K-+He3→πYN+N′ reactions using a 1GeV/cK - beam, with the objective of understanding the broad decay width of K̄NN (approximately twice as broad as that of Λ(1405) considered to be the K̄N quasibound state). We successfully reproduced distributions of the πYN invariant mass and momentum transfer for πYN using model-fitting functions for K̄NN formation and quasifree K̄ absorption (QFK̄-abs) processes. The model can describe the experimental data quite well, and four K̄NN→πYN cross sections were obtained. The results indicate that mesonic decay is the dominant decay branch of K̄NN. The results also suggest that ΓπΛN≈ΓπςN, which indicates that the IK̄N=1 absorption channel, in addition to the IK̄N=0 absorption... (More)
We conducted measurements of K-+He3→πYN+N′ reactions using a 1GeV/cK - beam, with the objective of understanding the broad decay width of K̄NN (approximately twice as broad as that of Λ(1405) considered to be the K̄N quasibound state). We successfully reproduced distributions of the πYN invariant mass and momentum transfer for πYN using model-fitting functions for K̄NN formation and quasifree K̄ absorption (QFK̄-abs) processes. The model can describe the experimental data quite well, and four K̄NN→πYN cross sections were obtained. The results indicate that mesonic decay is the dominant decay branch of K̄NN. The results also suggest that ΓπΛN≈ΓπςN, which indicates that the IK̄N=1 absorption channel, in addition to the IK̄N=0 absorption channel, substantially contributes to the K̄NN decay, making the K̄NN state approximately twice as unstable as Λ(1405). © 2024 American Physical Society. (Less)
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author
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author collaboration
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review C
volume
110
issue
1
article number
014002
publisher
American Physical Society
external identifiers
  • scopus:85198990014
ISSN
2469-9985
DOI
10.1103/PhysRevC.110.014002
language
English
LU publication?
yes
id
72148a30-7dad-4727-84fe-d86d8c02ca76
date added to LUP
2024-09-11 14:33:59
date last changed
2024-09-11 14:35:09
@article{72148a30-7dad-4727-84fe-d86d8c02ca76,
  abstract     = {{We conducted measurements of K-+He3→πYN+N′ reactions using a 1GeV/cK - beam, with the objective of understanding the broad decay width of K̄NN (approximately twice as broad as that of Λ(1405) considered to be the K̄N quasibound state). We successfully reproduced distributions of the πYN invariant mass and momentum transfer for πYN using model-fitting functions for K̄NN formation and quasifree K̄ absorption (QFK̄-abs) processes. The model can describe the experimental data quite well, and four K̄NN→πYN cross sections were obtained. The results indicate that mesonic decay is the dominant decay branch of K̄NN. The results also suggest that ΓπΛN≈ΓπςN, which indicates that the IK̄N=1 absorption channel, in addition to the IK̄N=0 absorption channel, substantially contributes to the K̄NN decay, making the K̄NN state approximately twice as unstable as Λ(1405).  © 2024 American Physical Society.}},
  author       = {{Yamaga, T. and Tatsuno, H. and Zmeskal, J.}},
  issn         = {{2469-9985}},
  language     = {{eng}},
  number       = {{1}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review C}},
  title        = {{Measurement of the mesonic decay branch of the K̄ NN quasibound state}},
  url          = {{http://dx.doi.org/10.1103/PhysRevC.110.014002}},
  doi          = {{10.1103/PhysRevC.110.014002}},
  volume       = {{110}},
  year         = {{2024}},
}