학술논문
Measurement of differential cross sections for $\Sigma^+p$ elastic scattering in the momentum range 0.44-0.80 GeV/c
Document Type
Working Paper
Author
Collaboration, J-PARC E40; Nanamura, T.; Miwa, K.; Ahn, J. K.; Akazawa, Y.; Aramaki, T.; Ashikaga, S.; Callier, S.; Chiga, N.; Choi, S. W.; Ekawa, H.; Evtoukhovitch, P.; Fujioka, N.; Fujita, M.; Gogami, T.; Harada, T. K.; Hasegawa, S.; Hayakawa, S. H.; Honda, R.; Hoshino, S.; Hosomi, K.; Ichikawa, M.; Ichikawa, Y.; Ieiri, M.; Ikeda, M.; Imai, K.; Ishikawa, Y.; Ishimoto, S.; Jung, W. S.; Kajikawa, S.; Kanauchi, H.; Kanda, H.; Kitaoka, T.; Kang, B. M.; Kawai, H.; Kim, S. H.; Kobayashi, K.; Koike, T.; Matsuda, K.; Matsumoto, Y.; Nagao, S.; Nagatomi, R.; Nakada, Y.; Nakagawa, M.; Nakamura, I.; Naruki, M.; Ozawa, S.; Raux, L.; Rogers, T. G.; Sakaguchi, A.; Sakao, T.; Sako, H.; Sato, S.; Shiozaki, T.; Shirotori, K.; Suzuki, K. N.; Suzuki, S.; Tabata, M.; Taille, C. d. L.; Takahashi, H.; Takahashi, T.; Takahashi, T. N.; Tamura, H.; Tanaka, M.; Tanida, K.; Tsamalaidze, Z.; Ukai, M.; Umetsu, H.; Wada, S.; Yamamoto, T. O.; Yoshida, J.; Yoshimura, K.
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Subject
Language
Abstract
We performed a novel $\Sigma^+ p$ scattering experiment at the J-PARC Hadron Experimental Facility. Approximately 2400 $\Sigma^+ p$ elastic scattering events were identified from $4.9 \times 10^7$ tagged $\Sigma^+$ particles in the $\Sigma^+$ momentum range 0.44 -- 0.80 GeV/$c$. The differential cross sections of the $\Sigma^+ p$ elastic scattering were derived with much better precision than in previous experiments. The obtained differential cross sections were approximately 2 mb/sr or less, which were not as large as those predicted by the fss2 and FSS models based on the quark cluster model in the short-range region. By performing phase-shift analyses for the obtained differential cross sections, we experimentally derived the phase shifts of the $^3 S_1$ and $^1 P_1$ channels for the first time. The phase shift of the $^3 S_1$ channel, where a large repulsive core was predicted owing to the Pauli effect between quarks, was evaluated as $20^\circ<|\delta_{^3S_1}|<35^\circ$. If the sign of $\delta_{^3S_1}$ is assumed to be negative, the interaction in this channel is moderately repulsive, as the Nijmegen extended-sort-core models predicted.