Missing-Mass Measurement of the 12C(K-, K+) Reaction at 1.8 GeV/c with the Superconducting Kaon Spectrometer

Yudai Ichikawa, Jung Keun Ahn, Yuya Akazawa, Kanae Aoki, Elena Botta, Hiroyuki Ekawa, Petr Evtoukhovitch, Alessandro Feliciello, Manami Fujita, Toshiyuki Gogami, Shoichi Hasegawa, Tomoyuki Hasegawa, Shuhei Hayakawa, Tomonori Hayakawa, Ryotaro Honda, Kenji Hosomi, Ken'ichi Imai, Wooseung Jung, Shunsuke Kanatsuki, Shin Hyung KimShinji Kinbara, Kazuya Kobayashi, Jaeyong Lee, Simonetta Marcello, Koji Miwa, Taejin Moon, Tomofumi Nagae, Yoshiyuki Nakada, Manami Nakagawa, Takuya Nanamura, Megumi Naruki, Atsushi Sakaguchi, Hiroyuki Sako, Yuki Sasaki, Susumu Sato, Kotaro Shirotori, Hitoshi Sugimura, Toshiyuki Takahashi, Hirokazu Tamura, Kiyoshi Tanida, Zviadi Tsamalaidze, Mifuyu Ukai, Takeshi O. Yamamoto

Research output: Contribution to journalArticlepeer-review

Abstract

We performed a measurement of the inclusive missing-mass spectrum of the 12C(K-,K+) reaction at an incident beam momentum of 1.8 GeV/c. This measurement was carried out by using the Superconducting Kaon Spectrometer (SKS) and the K1.8 beamline spectrometer at the Hadron Experimental Facility in J-PARC. From the missing-mass of the 12C(K-,K+) reaction, the binding energy of ξ- hyperon in a core 11 B nucleus, Bξ-, calculated. Our experimental setup yielded a good energy resolution of 8.2 MeV (full width at half maximum), which allowed us to observe significant enhancements in the proximity of the 12ξ Be production threshold region. In order to extract information from the missing-mass spectrum, we employed several fitting parameters assumptions. A good agreement with the spectrum shape was obtained by adding two Gaussian functions, with the constant experimental resolution for the ξ-hypernuclear states, to the background distribution. The peak positions were obtained to bξ =8.9 ± 1.4 (stat.)+3.8-3.1 (syst.) MeV and Bξ = - 2.4 ± 1.3 (stat.)+2.8-1.2 (syst.) MeV. Another model assumption, one Breit-Wigner function with Bξ = - 2.7 + 2.2 (stat.)+0.5-0.7 (syst.) MeV and γ = 4.1 ± 2.1 (stat.)+1.2-0.7 (syst.) MeV, also yielded a similar χ2 value.

Original languageEnglish
Article number091D01
JournalProgress of Theoretical and Experimental Physics
Volume2024
Issue number9
DOIs
StatePublished - 1 Sep 2024

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