K - Pp bound system at J-PARC

Fuminori Sakuma, Shuhei Ajimura, Hidemitsu Asano, George Beer, Carolina Berucci, Hyoungchan Bhang, Mario Bragadireanu, Paul Buehler, Luigi Busso, Michael Cargnelli, Seonho Choi, Catalina Curceanu, Shun Enomoto, Hiroyuki Fujioka, Yuya Fujiwara, Tomokazu Fukuda, Carlo Guaraldo, Tadashi Hashimoto, Ryugo S. Hayano, Toshihiko HiraiwaMasami Iio, Mihai Iliescu, Kentaro Inoue, Yosuke Ishiguro, Takashi Ishikawa, Shigeru Ishimoto, Kenta Itahashi, Masahiko Iwasaki, Koki Kanno, Kazuma Kato, Yuko Kato, Shingo Kawasaki, Paul Kienle, Hiroshi Kou, Yue Ma, Johann Marton, Yasuyuki Matsuda, Yutaka Mizoi, Ombretta Morra, Tomofumi Nagae, Hiroyuki Noumi, Hiroaki Ohnishi, Shinji Okada, Haruhiko Outa, Kristian Piscicchia, Yuta Sada, Atsushi Sakaguchi, Masaharu Sato, Alessandro Scordo, Michiko Sekimoto, Hexi Shi, Kotaro Shirotori, Diana Sirghi, Florin Sirghi, Ken Suzuki, Shoji Suzuki, Takatoshi Suzuki, Kiyoshi Tanida, Hideyuki Tatsuno, Makoto Tokuda, Dai Tomono, Akihisa Toyoda, Kyo Tsukada, Oton Vázquez Doce, Eberhard Widmann, Takumi Yamaga, Toshimitsu Yamazaki, Qi Zhang, Johannes Zmeskal

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The K̄NN bound system, symbolically denoted as "K-pp", is the simplest K̄-nuclear bound system which has been widely discussed as a consequence of the strongly attractive K̄N interaction in I = 0 channels. Many theoretical works have pointed out the existence of the "K-pp" bound system, but the calculated properties such as the binding energy and the width spread out due to the uncertainty of the K̄N interaction below the K̄+N mass threshold. Experimentally, there are several reports on observation of a "K-pp" candidate with the binding energy of around 100 MeV, however, no definitive evidence was available so far. At J-PARC, we conducted a experimental search for the "K-pp" bound system using K- + 3He reaction at 1.0 GeV/c where the "K-pp" is expected to be directly produced via the (K-, n) reaction. We finally observed a bound state below the K- +p+p mass threshold in the Λpn final state, which can be interpreted as the "K- pp" bound state. The possible existence of the "K- pp" state is discussed from both aspects of production and decay.

Original languageEnglish
Title of host publicationProceedings of the 15th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon
EditorsCurtis Meyer, Reinhard A. Schumacher
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735420083
DOIs
Publication statusPublished - 2020 Jul 27
Event15th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon, MENU 2019 - Pittsburgh, United States
Duration: 2019 Jun 22019 Jun 7

Publication series

NameAIP Conference Proceedings
Volume2249
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference15th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon, MENU 2019
CountryUnited States
CityPittsburgh
Period19/6/219/6/7

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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