Inclusive spectrum of the d(π+, K+) reaction at 1.69∈GeV/c

Yudai Ichikawa, Tomofumi Nagae, Hyoungchan Bhang, Stefania Bufalino, Hiroyuki Ekawa, Petr Evtoukhovitch, Alessandro Feliciello, Hiroyuki Fujioka, Shoichi Hasegawa, Shuhei Hayakawa, Ryotaro Honda, Kenji Hosomi, Ken'Ichi Imai, Shigeru Ishimoto, Changwoo Joo, Shunsuke Kanatsuki, Ryuta Kiuchi, Takeshi Koike, Harphool Kumawat, Yuki MatsumotoKoji Miwa, Manabu Moritsu, Megumi Naruki, Masayuki Niiyama, Yuki Nozawa, Ryosuke Ota, Atsushi Sakaguchi, Hiroyuki Sako, Valentin Samoilov, Susumu Sato, Kotaro Shirotori, Hitoshi Sugimura, Shoji Suzuki, Toshiyuki Takahashi, Tomonori N. Takahashi, Hirokazu Tamura, Toshiyuki Tanaka, Kiyoshi Tanida, Atsushi O. Tokiyasu, Zviadi Tsamalaidze, Bidyut Roy, Mifuyu Ukai, Takeshi O. Yamamoto, Seongbae Yang

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We have measured an inclusive missing-mass spectrum of the d(π+, K+) reaction at a pion incident momentum of 1.69∈GeV/c at laboratory scattering angles between 2\circ and 16\circ with a missing-mass resolution of 2.7 \pm 0.1MeV/c{2} (FWHM) at the missing mass of 2.27∈GeV/c{2}. In this letter, we first try to understand the spectrum as a simple quasi-free picture based on several known elementary cross sections, considering the neutron/proton Fermi motion in the deuteron. While gross spectrum structures are well understood in this picture, we have observed two distinct deviations; one peculiar enhancement at 2.13∈GeV/c{2} is due to the \Sigma N cusp, and the other notable feature is a shift of a broad bump structure, mainly originating from hyperon resonance productions of \Lambda (1405) and \Sigma (1385){+ /0}, by about 22.4 \pm 0.4 (stat.) {+2.7}-{-1.7} (syst.)∈MeV/c{2} toward the low-mass side, which is calculated in the kinematics of a proton at rest as the target.

Original languageEnglish
Article number101D03
JournalProgress of Theoretical and Experimental Physics
Volume2014
Issue number10
DOIs
Publication statusPublished - 2014 Jul 2

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Ichikawa, Y., Nagae, T., Bhang, H., Bufalino, S., Ekawa, H., Evtoukhovitch, P., Feliciello, A., Fujioka, H., Hasegawa, S., Hayakawa, S., Honda, R., Hosomi, K., Imai, KI., Ishimoto, S., Joo, C., Kanatsuki, S., Kiuchi, R., Koike, T., Kumawat, H., ... Yang, S. (2014). Inclusive spectrum of the d(π+, K+) reaction at 1.69∈GeV/c. Progress of Theoretical and Experimental Physics, 2014(10), [101D03]. https://doi.org/10.1093/ptep/ptu128