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The differential cross sections of the {\Sigma}-p --> {\Lambda} n reactionwere measured accurately for the {\Sigma}- momentum (p_{{\Sigma}}) ranging from470 to 650 MeV/c at the J-PARC Hadron Experimental Facility. Precise angularinformation about the {\Sigma}-p --> {\Lambda} n reaction was obtained for thefirst time by detecting approximately 100 reaction events at each angular stepof {\Delta}cos{\theta} = 0.1. The obtained differential cross sections showslightly forward-peaking structure in the measured momentum regions.The crosssections 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 for470<p_{{\Sigma}}(MeV/c)<550 and 550<p_{{\Sigma}}(MeV/c)<650, respectively.These results show a drastic improvement compared to past measurements of thehyperon-proton scattering experiments. They will play essential roles inupdating the theoretical models of the baryon-baryon interactions.

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