An event excess observed in the deeply bound region of the C-12(K-,p) missing-mass spectrum
- Authors
- Ichikawa, Yudai; Yamagata-Sekihara, Junko; Ahn, Jung Keun; Akazawa, Yuya; Aoki, Kanae; Botta, Elena; Ekawa, Hiroyuki; Evtoukhovitch, Petr; Feliciello, Alessandro; Fujita, Manami; Gogami, Toshiyuki; Hasegawa, Shoichi; Hasegawa, Tomoyuki; Hayakawa, Shuhei; Hayakawa, Tomonori; Hirenzaki, Satoru; Honda, Ryotaro; Hosomi, Kenji; Imai, Ken'ichi; Jung, Wooseung; Kanatsuki, Shunsuke; Kim, Shin Hyung; Kinbara, Shinji; Kobayashi, Kazuya; Lee, Jaeyong; Marcello, Simonetta; Miwa, Koji; Moon, Taejin; Nagae, Tomofumi; Nakada, Yoshiyuki; Nakagawa, Manami; Nanamura, Takuya; Naruki, Megumi; Sakaguchi, Atsushi; Sako, Hiroyuki; Sato, Susumu; Sasaki, Yuki; Shirotori, Kotaro; Sugimura, Hitoshi; Takahashi, Toshiyuki; Tamura, Hirokazu; Tanida, Kiyoshi; Tsamalaidze, Zviadi; Ukai, Mifuyu; Yamamoto, Takeshi O.
- Issue Date
- 12월-2020
- Publisher
- OXFORD UNIV PRESS INC
- Citation
- PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, v.2020, no.12
- Indexed
- SCIE
SCOPUS
- Journal Title
- PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS
- Volume
- 2020
- Number
- 12
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/130345
- DOI
- 10.1093/ptep/ptaa139
- ISSN
- 2050-3911
- Abstract
- We have measured, for the first time, the inclusive missing-mass spectrum of the C-12(K-,p) reaction at an incident kaon momentum of 1.8 GeV/c at the J-PARC K1.8 beamline. We observed a prominent quasi-elastic peak (K- p -> K- p) in this spectrum. In the quasi-elastic peak region, the effect of secondary interaction is apparently observed as a peak shift, and the peak exhibits a tail in the bound region. We compared the spectrum with a theoretical calculation based on the Green's function method by assuming different values of the parameters for the (K) over bar -nucleus optical potential. We found that the spectrum shape in the binding-energy region -300 MeV < B-K < 40 MeV is best reproduced with the potential depths V-0 = -80 MeV (real part) and W-0 = -40 MeV (imaginary part). On the other hand, we observed a significant event excess in the deeply bound region around B-K similar to 100 MeV, where the major decay channel of K- NN -> pi Sigma N is energetically closed, and the non-mesonic decay modes (K- NN -> Lambda N and Sigma N) should mainly contribute. The enhancement is fitted well by a Breit-Wigner function with a kaon-binding energy of 90 MeV and width 100 MeV. A possible interpretation is a deeply bound state of a Y*-nucleus system.
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