Photoproduction of η mesons off protons for Eγ≤1.15 GeV

T. Nakabayashi, H. Fukasawa, R. Hashimoto, T. Ishikawa, T. Iwata, H. Kanda, J. Kasagi, T. Kinoshita, K. Maeda, F. Miyahara, K. Nawa, T. Nomura, H. Shimizu, T. Shishido, K. Suzuki, Y. Tajima, T. Takahashi, H. Ueno, H. Yamazaki, H. Y. Yoshida

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Abstract

η mesons emitted from the photoproduction off protons were measured for 0.70≤Eγ≤1.15 GeV. The γp→ηp reaction process was separated from the πηp final state by the momentum difference of η mesons for Eγ≥930 MeV. The angular distributions obtained and the excitation function of the γp→ηp reaction are essentially in good agreement with previously reported ones and are well explained by η-MAID calculations. For the γp→πηN reaction, the cross section increases monotonically with increasing photon energy, and it almost reaches the value of the γp→ηp reaction at Eγ~1.15 GeV. The momentum distributions are compared with kinematic calculations. It is suggested that the sequential decay process through the P33(1232) resonance [γp→η P33(1232)→πηN] contributes to the γp→πηN reaction, in addition to the sequential process γp→πS11(1535) →πηN and/or π and η emissions without intermediate nucleon resonances.

Original languageEnglish
Article number035202
JournalPhysical Review C - Nuclear Physics
Volume74
Issue number3
DOIs
Publication statusPublished - 2006 Jan 1

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Nakabayashi, T., Fukasawa, H., Hashimoto, R., Ishikawa, T., Iwata, T., Kanda, H., Kasagi, J., Kinoshita, T., Maeda, K., Miyahara, F., Nawa, K., Nomura, T., Shimizu, H., Shishido, T., Suzuki, K., Tajima, Y., Takahashi, T., Ueno, H., Yamazaki, H., & Yoshida, H. Y. (2006). Photoproduction of η mesons off protons for Eγ≤1.15 GeV. Physical Review C - Nuclear Physics, 74(3), [035202]. https://doi.org/10.1103/PhysRevC.74.035202