3 years ago

Differential cross section and photon beam asymmetry for the gamma p -> pi+ n reaction at forward pi+ angles at Egamma=1.5-2.95 GeV.

T. Nakano, M. Oka, J.K. Ahn, S.H. Hwang, S.H. Shiu, Y. Sugaya, Y. Ohashi, T. Hotta, S. Fukui, H. Fujimura, H. Kohri, H. Ejiri, Y. Maeda, H. Noumi, T. Mibe, Y. Kon, T. Ohta, N. Muramatsu, M. Ungaro, S.Y. Ryu, M. Fujiwara, W.C. Chang, C. Rangacharyulu, Y. Kato, K. Hicks, Y. Oh, H.S. Lee, S. Date, D.S. Ahn, M. Yosoi, T. Ishikawa, K. Imai, T. Tsunemi, Y. Morino, M. Niiyama, W. Gohn, H. Shimizu, T. Sawada, Y. Yanai, M. Uchida, M. Sumihama, Y. Nakatsugawa, M. Miyabe, S.H. Kim, K. Joo, S.Y. Wang, A. Hosaka, J.Y. Chen, J.D. Parker

Differential cross sections and photon beam asymmetries for the gamma p -> pi+ n reaction have been measured for 0.6<cos(theta)<1 and Egamma=1.5-2.95 GeV at SPring-8/LEPS. The cross sections monotonically decrease as the photon beam energy increases for 0.6<cos(theta)<0.9. However, the energy dependence of the cross sections for 0.9<cos(theta)<1 and Egamma=1.5-2.2 GeV (W=1.9-2.2 GeV) is different, which may be due to a nucleon or Delta resonance. The present cross sections agree well with the previous cross sections measured by other groups and show forward peaking, suggesting significant t-channel contributions in this kinematical region. The asymmetries are found to be positive, which can be explained by rho-exchange in the t-channel. Large positive asymmetries in the small |t| region, where the rho-exchange contribution becomes small, could be explained by introducing pi-exchange interference with the s-channel.

Publisher URL: http://arxiv.org/abs/1708.09574

DOI: arXiv:1708.09574v2

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