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

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arxiv 2111.14277 v3 pith:VI6W5I66 submitted 2021-11-29 nucl-ex nucl-th

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

J-PARC E40 Collaboration: K. Miwa , J. K. Ahn , Y. Akazawa , T. Aramaki , S. Ashikaga , S. Callier , N. Chiga , S. W. Choi
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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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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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    Isospin breaking splits threshold cusps in ΛN-ΣN scattering into constrained structures whose relative sharpness or type can change, as shown via K-matrix classification and N²LO chiral EFT calculations.