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

• Published in: Physics letters. B Vol. 314; no. 2; pp. 246 - 254
• Main Authors: Aoyagi, H., Fukui, S., Hasegawa, T., Hayashi, N., Horikawa, N., Iizuka, J., Inaba, S., Ishimoto, S., Ishizaki, Y., Iwata, T., Kanatani, E., Kawai, H., Kinashi, T., Kishi, A., Kobayashi, K., Matsuda, K., Matsuda, T., Mori, K., Nakagawa, T., Nakamura, S., Nakamura, T., Nakanishi, T., Narita, A., Ohmi, K., Ohmori, C., Samoto, T., Shimizu, H., Tajima, Y., Takamatsu, K., Takasaki, M., Tsubaki, T., Tsuchiya, K., Tsuru, T., Yamauchi, I., Yasu, Y., Yoshida, H.Y., Wakai, A.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 16.09.1993; Elsevier Science
• Subjects: Exact sciences and technology; Hadron-induced low- and intermediate-energy reactions and scattering (energy ≤ 10 gev); Physics; Specific reactions and phenomenology; The physics of elementary particles and fields; Low energy; Mass; Asymmetry; Intensity; Elementary particle; Particle system
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(93)90456-R

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 ⩽ M ηπ - ⩽ 1.8 GeV/ c 2 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/ c 2 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 a 2 (1320) is clearly seen. An enhancement is observed around 1.3 GeV/ c 2 in the P + wave.