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

Abstract

A high statistics $\hat{I}\pounds p$ scattering experiment has been performed at the J-PARC Hadron Experimental Facility. Data for momentum-tagged $\hat{I}{\pounds }^{-}$ running in a liquid hydrogen target were accumulated by detecting the $\ddot{I}{€}^{-}p\to K^{+}\hat{I}{\pounds }^{-}$ reaction with a high intensity $\ddot{I}{€}^{-}$ beam of 20 M/spill. Differential cross sections of the $\hat{I}{\pounds }^{-}p$ elastic scattering were derived with a drastically improved accuracy by identifying the largest statistics of about 4,500 events from 1.72 $\times$ $10^7$ $\hat{I}{\pounds }^{-}$. The derived differential cross section shows a clear forward-peaking angular distribution for a $\hat{I}{\pounds }^{-}$ 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.