Study of the ηπ- system in the π-p reaction at 6.3 GeV/c

H. Aoyagi, S. Fukui, T. Hasegawa, N. Hayashi, N. Horikawa, J. Iizuka, S. Inaba, S. Ishimoto, Y. Ishizaki, T. Iwata, E. Kanatani, H. Kawai, T. Kinashi, A. Kishi, K. Kobayashi, K. Matsuda, T. Matsuda, K. Mori, T. Nakagawa, S. NakamuraT. Nakamura, T. Nakanishi, A. Narita, K. Ohmi, C. Ohmori, T. Samoto, H. Shimizu, Y. Tajima, K. Takamatsu, M. Takasaki, T. Tsubaki, K. Tsuchiya, T. Tsuru, I. Yamauchi, Y. Yasu, H. Y. Yoshida, A. Wakai

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Abstract

Data of the ηπ- system were obtained in the reaction π-p → ηπ-p at 6.3 GeV/c beam momentum. About 17 k events of ηπ- were collected in the mass range 0.8 ≤ Mηπ- ≤ 1.8 GeV/c2 and in the range of the momentum transfer squared 0.075 ≤ |t′| ≤ 0.60 (GeV/c)2. A large forward-backward asymmetry was observed around 1.3 GeV/c2 in the Gottfried-Jackson frame of the ηπ- system. A partial wave analysis of the data was performed. A peak of the D+ wave attributed to a2 (1320) is clearly seen. An enhancement is observed around 1.3 GeV/c2 in the P+ wave.

Original languageEnglish
Pages (from-to)246-254
Number of pages9
JournalPhysics Letters B
Volume314
Issue number2
DOIs
Publication statusPublished - 1993 Sep 16

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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