“K−pp” a K‾-meson nuclear bound state, observed in 3He(K−,Λp)n reactions
(2019) In Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 789. p.620-625- Abstract
- We observed a distinct peak in the Λp invariant mass spectrum of He3(K−,Λp)n, well below mK+2mp, i.e., the mass threshold of the K− to be bound to two protons. By selecting a relatively large momentum-transfer region q=350∼650 MeV/c, one can kinematically separate the peak from the quasi-free process, K‾N→K‾N followed by the non-resonant absorption by the two spectator-nucleons K‾NN→ΛN. We found that the simplest fit to the observed peak gives us a Breit–Wigner pole position at BKpp=47±3(stat.)−6 +3(sys.) MeV having a width ΓKpp=115±7(stat.)−20 +10(sys.) MeV, and the S-wave Gaussian reaction form-factor parameter QKpp=381±14(stat.)−0 +57(sys.) MeV/c, as a new form of the nuclear bound system with strangeness – “K−pp”.
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- author
- Ajimura, S. ; Tatsuno, H. LU and Zmeskal, J.
- author collaboration
- organization
- publishing date
- 2019
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Kaon, Mesonic nuclear bound state, Strangeness
- in
- Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
- volume
- 789
- pages
- 6 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:85059823166
- ISSN
- 0370-2693
- DOI
- 10.1016/j.physletb.2018.12.058
- language
- English
- LU publication?
- yes
- id
- b3b39cf4-331c-489a-b32c-63277711893d
- date added to LUP
- 2022-04-07 10:35:23
- date last changed
- 2023-11-29 01:42:36
@article{b3b39cf4-331c-489a-b32c-63277711893d, abstract = {{We observed a distinct peak in the Λp invariant mass spectrum of He3(K−,Λp)n, well below mK+2mp, i.e., the mass threshold of the K− to be bound to two protons. By selecting a relatively large momentum-transfer region q=350∼650 MeV/c, one can kinematically separate the peak from the quasi-free process, K‾N→K‾N followed by the non-resonant absorption by the two spectator-nucleons K‾NN→ΛN. We found that the simplest fit to the observed peak gives us a Breit–Wigner pole position at BKpp=47±3(stat.)−6 +3(sys.) MeV having a width ΓKpp=115±7(stat.)−20 +10(sys.) MeV, and the S-wave Gaussian reaction form-factor parameter QKpp=381±14(stat.)−0 +57(sys.) MeV/c, as a new form of the nuclear bound system with strangeness – “K−pp”.}}, author = {{Ajimura, S. and Tatsuno, H. and Zmeskal, J.}}, issn = {{0370-2693}}, keywords = {{Kaon; Mesonic nuclear bound state; Strangeness}}, language = {{eng}}, pages = {{620--625}}, publisher = {{Elsevier}}, series = {{Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics}}, title = {{“K−pp” a K‾-meson nuclear bound state, observed in 3He(K−,Λp)n reactions}}, url = {{http://dx.doi.org/10.1016/j.physletb.2018.12.058}}, doi = {{10.1016/j.physletb.2018.12.058}}, volume = {{789}}, year = {{2019}}, }