The analysis for Σ^- yield in Σ p scattering experiment (J-PARC E40)

 Understanding of S N (I = 3/2, S = 1) interaction is a key to reveal the origin of the short range core in the baryon – baryon interactions because a large repulsive force is predicted to originate from Pauli effect in the quark level and S N interactions are also not understood well. Therefore the systematic study of S N channel is very important.

In order to investigate these topics, we have planed a S p scattering experiment (J-PARC E40) and will measure the differential cross sections of Σ⁺ p and Σ^- p elastic scatterings and Σ^- p -> Λ n inelastic scattering.  In this experiment, we detect successive sets of two-body reactions in a liquid hydrogen target; p p -> S K⁺ by the spectrometers up/downstream from the target, and S p -> S p scattering event by the scattered proton detector surrounding the target (CATCH).

We started a Σ^- p scattering experiment at first and took a part of the Σ^- production data in June 2018 and we will report the analysis for Σ^- yield.