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arXiv · 2111.14277

Precise measurement of differential cross sections of the {\Sigma}-p --> {\Lambda} n reaction in momentum range 470-650 MeV/c

PARC E40 Collaboration·K. Miwa·J. K. Ahn·Y. Akazawa·T. Aramaki·S. Ashikaga·S. Callier·N. Chiga·S. W. Choi·H. Ekawa·P. Evtoukhovitch·N. Fujioka·M. Fujita·T. Gogami·T. Harada·S. Hasegawa·S. H. Hayakawa·R. Honda·S. Hoshino·K. Hosomi·M. Ichikawa·Y. Ichikawa·M. Ieiri·M. Ikeda·K. Imai·Y. Ishikawa·S. Ishimoto·W. S. Jung·S. Kajikawa·H. Kanauchi·H. Kanda·T. Kitaoka·B. M. Kang·H. Kawai·S. H. Kim·K. Kobayashi·T. Koike·K. Matsuda·Y. Matsumoto·S. Nagao·R. Nagatomi·Y. Nakada·M. Nakagawa·I. Nakamura·T. Nanamura·M. Naruki·S. Ozawa·L. Raux·T. G. Rogers·A. Sakaguchi·T. Sakao·H. Sako·S. Sato·T. Shiozaki·K. Shirotori·K. N. Suzuki·S. Suzuki·M. Tabata·C. d. L. Taille·H. Takahashi·T. Takahashi·T. N. Takahashi·H. Tamura·M. Tanaka·K. Tanida·Z. Tsamalaidze·M. Ukai·H. Umetsu·S. Wada·T. O. Yamamoto·J. Yoshida·K. Yoshimura
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Abstract

The differential cross sections of the {\Sigma}-p --> {\Lambda} n reaction were measured accurately for the {\Sigma}- momentum (p_{{\Sigma}}) ranging from 470 to 650 MeV/c at the J-PARC Hadron Experimental Facility. Precise angular information about the {\Sigma}-p --> {\Lambda} n reaction was obtained for the first time by detecting approximately 100 reaction events at each angular step of {\Delta}cos{\theta} = 0.1. The obtained differential cross sections show slightly forward-peaking structure in the measured momentum regions.The cross sections integrated for -0.7 < cos{\theta} < 1.0 were obtained as 22.5 +- 0.68 (stat.) +- 0.65 (syst.) mb and 15.8 +-0.83(stat.) +- 0.52 (syst.) mb for 470<p_{{\Sigma}}(MeV/c)<550 and 550<p_{{\Sigma}}(MeV/c)<650, respectively. These results show a drastic improvement compared to past measurements of the hyperon-proton scattering experiments. They will play essential roles in updating the theoretical models of the baryon-baryon interactions.

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PARC E40 Collaboration, K. Miwa, J. K. Ahn, Y. Akazawa, T. Aramaki, S. Ashikaga, S. Callier, N. Chiga, S. W. Choi, H. Ekawa, P. Evtoukhovitch, N. Fujioka, M. Fujita, T. Gogami, T. Harada, S. Hasegawa, S. H. Hayakawa, R. Honda, S. Hoshino, K. Hosomi, M. Ichikawa, Y. Ichikawa, M. Ieiri, M. Ikeda, K. Imai, Y. Ishikawa, S. Ishimoto, W. S. Jung, S. Kajikawa, H. Kanauchi, H. Kanda, T. Kitaoka, B. M. Kang, H. Kawai, S. H. Kim, K. Kobayashi, T. Koike, K. Matsuda, Y. Matsumoto, S. Nagao, R. Nagatomi, Y. Nakada, M. Nakagawa, I. Nakamura, T. Nanamura, M. Naruki, S. Ozawa, L. Raux, T. G. Rogers, A. Sakaguchi, T. Sakao, H. Sako, S. Sato, T. Shiozaki, K. Shirotori, K. N. Suzuki, S. Suzuki, M. Tabata, C. d. L. Taille, H. Takahashi, T. Takahashi, T. N. Takahashi, H. Tamura, M. Tanaka, K. Tanida, Z. Tsamalaidze, M. Ukai, H. Umetsu, S. Wada, T. O. Yamamoto, J. Yoshida, K. Yoshimura. 2021-11-29. Precise measurement of differential cross sections of the {\Sigma}-p --> {\Lambda} n reaction in momentum range 470-650 MeV/c. https://arxiv.org/abs/2111.14277

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