Measurement of the differential cross sections of the Sigma-p elastic scattering in momentum range of 470 to 850 MeV/c

A high statistics $Sigma p$ scattering experiment has been performed at the J-PARC Hadron Experimental Facility. Data for momentum-tagged $Sigma^{-}$ running in a liquid hydrogen target were accumulated by detecting the $pi^{-}p to K^{+}Sigma^{-}$ reaction with a high intensity $pi^{-}$ beam of 20 M/spill. Differential cross sections of the $Sigma^{-}p$ elastic scattering were derived with a drastically improved accuracy by identifying the largest statistics of about 4,500 events from 1.72 $times$ $10^{7}$ $Sigma^{-}$. The derived differential cross section shows a clear forward-peaking angular distribution for a $Sigma^{-}$ momentum range from 470 to 850 MeV/$c$. The accurate data will impose a strong constraint on the theoretical models of the baryon-baryon interactions.