Observation of the "k-pp " -like structure in the d (π+, K+) reaction at 1.69 GeV/ c

Yudai Ichikawa, Tomofumi Nagae, Hiroyuki Fujioka, Hyoungchan Bhang, Stefania Bufalino, Hiroyuki Ekawa, Petr Evtoukhovitch, Alessandro Feliciello, 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

研究成果: Article査読

37 被引用数 (Scopus)

抄録

We have observed a "K-pp" -like structure in the d(π+,K+) reaction at 1.69 GeV/c. In this reaction, a Λ (1405) hyperon resonance is expected to be produced as a doorway to form K-pp through the Λ ∗p→ K-pp process. However, most of the Λ (1405) produced would escape from the deuteron without secondary reactions. Therefore, coincidence of high-momentum (>250MeV/c) proton(s) at large emission angles (39° < θlab. < 122°) was requested to enhance the signal-to-background ratio. A broad enhancement in the proton coincidence spectra is observed around the missing mass of 2.27 GeV/c2, which corresponds to the K-pp binding energy of 95+18-17 (stat.) +30-21 (syst.) MeV and the width of 162+87-45 (stat.) +66-78 (syst.) MeV.

本文言語English
論文番号021D01
ジャーナルProgress of Theoretical and Experimental Physics
2015
2
DOI
出版ステータスPublished - 2015 1 29

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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