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Report No.

High statistics $$Sigma p$$ scattering experiment using high intensity pion beams at J-PARC

Miwa, Koji*; Hasegawa, Shoichi  ; Hayakawa, Shuhei; Hosomi, Kenji ; Imai, Kenichi; Kondo, Yasuhiro ; Naruki, Megumi; Sako, Hiroyuki  ; Sato, Susumu ; Sugimura, Hitoshi; Tamura, Hirokazu; Tanida, Kiyoshi  ; 40 of others*

In order to test theoretical frameworks of the Baryon-Baryon ($$BB$$) interactions and to confirm the "Pauli effect between quarks" for the first time, we have proposed an experiment (J-PARC E40) to measure low-energy hyperon-proton scattering cross sections of the $$Sigma^+ p$$, $$Sigma^- p$$ elastic scatterings and the $$Sigma^- p to Lambda n$$ inelastic scattering in the momentum range of $$400 < p ; ({rm MeV}/c) < 700$$ in the laboratory system. Experimentally, we detect two successive reactions of the $$Sigma$$ production $$(pi^{pm}p to K^+Sigma^{pm})$$ and the $$Sigma p$$ scattering ($$Sigma p to Sigma p$$) in the same liquid hydrogen target. The former is measured with two magnetic spectrometers, and the latter with a scattered proton detector (CATCH). By using a high intensity $$pi$$ beam, we estimate that more than 10000 scattering events can be identified. In this experiment, we aim to provide good quality scattering data to test the theoretical models of the $$BB$$ interaction.



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