Accès ouvert déclaré
2014
preprint
Search for the deeply bound $K^-pp$ state via the $^3$He($K^-,n)$ reaction at $p_{K^-}$=1 GeV/$c$
T. Hashimoto, Shuhei Ajimura, George Beer, H. Bhang, Mario Bragadireanu, P. Buehler, Luigi Busso, M. Cargnelli, Seonho Choi, C. Curceanu, S. Enomoto, Diego Faso, Hiroyuki Fujioka, Yuya Fujiwara, Tomokazu Fukuda, C. Guaraldo, R. Hayano, Toshihiko Hiraiwa, Iio M, M. Iliescu, Kentaro Inoue, Y. Ishiguro, Takashi Ishikawa, S. Ishimoto, T. Ishiwatari, K. Itahashi, Masaaki Iwai, M. Iwasaki, Shingo Kawasaki, Paul Kienle, Hiroshi Kou, Yue Ma, J. Márton, Y. Matsuda, Y. Mizoi, Ombretta Morra, T. Nagae, H. Noumi, H. Ohnìshì, S. Okada, H. Outa, Kristian Piscicchia, M. Poli Lener, A. Romero Vidal, Y. Sada, A. Sakaguchi, F. Sakuma, Masaharu Sato, A. Scordo, M. Sekimoto, H. Shi, Diana Laura Sirghi, F. Sirghi, K. Suzuki, S. Suzuki, Takatoshi Suzuki, K. Tanida, H. Tatsuno, Makoto Tokuda, Dai Tomono, A. Toyoda, Kyo Tsukada, O. Vázquez Doce, E. Widmann, B. Wünschek, T. Yamaga, Toshimitsu Yamazaki, H. Yim, Qi Zhang, J. Zmeskal
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Le résumé fourni par la source
An experiment to search for the $K^-pp$ bound state was performed via the in-flight $^3$He($K^-,n)$ reaction using 5.3 $\times$ $10^9$ kaons at 1 GeV/$c$ at the J-PARC hadron experimental facility. In the semi-inclusive neutron missing-mass spectrum at $\theta_{n}^{lab}=0^\circ$, no significant peak was observed in the region corresponding to $K^-pp$ binding energy larger than 80 MeV, where a bump structure has been reported in the $\Lambda p$ final state in different reactions. Assuming the state to be isotropically decaying into $\Lambda p$, mass-dependent upper limits on the production cross section were determined to be 30--180, 70--250, and 100--270 $\mu$b/sr, for the natural widths of 20, 60, and 100 MeV, respectively, at 95\% confidence level.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
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Les sujets associés
Particle physics theoretical and experimental studiesQuantum Chromodynamics and Particle InteractionsHigh-Energy Particle Collisions Research