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

Miwa, Koji*; Fujita, Manami; Hasegawa, Shoichi   ; Hosomi, Kenji  ; Ichikawa, Yudai*   ; Imai, Kenichi*; Nanamura, Takuya; Sako, Hiroyuki   ; Sato, Susumu  ; Tamura, Hirokazu; Tanida, Kiyoshi   ; Yamamoto, Takeshi  ; 59 of others*

The differential cross sections of the $${Sigma}^- p to {Lambda} n$$ reaction were measured accurately for the $${Sigma}^-$$ momentum $$(p_{{Sigma}})$$ ranging from 470 to 650 MeV/$$c$$ at the J-PARC Hadron Experimental Facility. Precise angular information about the $${Sigma}^- p to {Lambda} n$$ reaction was obtained for the first time by detecting approximately 100 reaction events at each angular step of $${Delta}cos{theta} = 0.1$$. The obtained differential cross sections show slightly forward-peaking structure in the measured momentum regions. The cross sections integrated for $$-0.7 < cos{theta} < 1.0$$ were obtained as $$22.5 pm 0.68 (stat.) pm 0.65 (syst.)$$ mb and $$15.8 pm 0.83(stat.) pm 0.52 (syst.)$$ mb for $$470 < p_{{Sigma}}$$ (MeV/c) $$<550$$ and $$550 < p_{{Sigma}}$$ (MeV/c)$$<650$$, respectively. These results show a drastic improvement compared to past measurements of the hyperon-proton scattering experiments. They will play essential roles in updating the theoretical models of the baryon-baryon interactions.

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Category:Physics, Multidisciplinary

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