“K−pp”, a K-meson nuclear bound state, observed in 3He(K−, Λ p)n reactions
| dc.contributor.author | J-PARC E15 collaboration | |
| dc.contributor.author | Ajimura, S. | |
| dc.contributor.author | Asano, H. | |
| dc.contributor.author | Beer, G. | |
| dc.contributor.author | Berucci, C. | |
| dc.contributor.author | Bhang, H. | |
| dc.contributor.author | Bragadireanu, M. | |
| dc.contributor.author | Buehler, P. | |
| dc.contributor.author | Busso, L. | |
| dc.contributor.author | et al. | |
| dc.date.accessioned | 2019-03-27T18:32:57Z | |
| dc.date.available | 2019-03-27T18:32:57Z | |
| dc.date.copyright | 2019 | en_US |
| dc.date.issued | 2019 | |
| dc.description.abstract | We observed a distinct peak in the Ap invariant mass spectrum of 3 He(K −, Ap)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, KN → KN followed by the non-resonant absorption by the two spectator-nucleons KNN → AN. We found that the simplest fit to the observed peak gives us a Breit–Wigner pole position at BKpp = 47 ± 3 (stat.) +3 (sys.) MeV having a width rKpp = 115 ± 7 (stat.) +10 (sys.) MeV, and the S-wave Gaussian reaction form-factor parameter QKpp 381 14 (stat.) 0 (sys.) MeV/c, as a new form of the nuclear bound system with strangeness – “K − pp”. | en_US |
| dc.description.reviewstatus | Reviewed | en_US |
| dc.description.scholarlevel | Faculty | en_US |
| dc.description.sponsorship | The authors are grateful to the staff members of J-PARC/KEK for their extensive efforts especially on the stable operation of the facility. We are also grateful to the fruitful discussions with Professors Akinobu Dote, Toru Harada, Takayasu Sekihara, Khin Swe Myint and Yoshinori Akaishi. This work is partly supported by MEXT Grants-in-Aid 26800158, 17K05481, 26287057, 24105003, 14102005, 17070007 and 18H05402. Part of this work is supported by the Ministero degli Affari Esteri e della Cooperazione Internazionale, Direzione Generale per la Promozione del Sistema Paese (MAECI), StrangeMatter project. | en_US |
| dc.identifier.citation | Ajimura, S., Asano, H., Beer, G., Berucci, C., Bhang, H., Bhang, H. & Zmeskal, J. (2018). “K−pp”, a K-meson nuclear bound state, observed in 3He(K−, Λ p)n reactions. Physics Letters B, (789), 620-625. https://doi.org/10.1016/j.physletb.2018.12.058 | en_US |
| dc.identifier.uri | https://doi.org/10.1016/j.physletb.2018.12.058 | |
| dc.identifier.uri | http://hdl.handle.net/1828/10675 | |
| dc.language.iso | en | en_US |
| dc.publisher | Physics Letters B | en_US |
| dc.subject | Kaon | en_US |
| dc.subject | Strangeness | en_US |
| dc.subject | Mesonic nuclear bound state | en_US |
| dc.title | “K−pp”, a K-meson nuclear bound state, observed in 3He(K−, Λ p)n reactions | en_US |
| dc.type | Article | en_US |