First measurement of differential cross sections and photon beam asymmetries for photoproduction of the f0(980) meson decaying into?0?0 at E? < 2.4 GeV

N. Muramatsu, S. K. Wang, Q. H. He,J. K. Ahn,W. C. Chang, J. Y. Chen, M. L. Chu, S. Date,T. Gogami, H. Goto, H. Hamano, T. Hashimoto, K. Hicks, T. Hiraiwa, Y. Honda, T. Hotta, H. Ikuno, Y. Inoue, T. Ishikawa, I. Jaegle, J. M. Jo, Y. Kasamatsu, H. Katsuragawa, S. Kido, Y. Kon, S. Masumoto, Y. Matsumura, M. Miyabe, K. Mizutani,T. Nakamura, T. Nakano, T. Nam, M. Niiyama, Y. Nozawa, Y. Ohashi, H. Ohnishi,T. Ohta, M. Okabe, K. Ozawa,C. Rangacharyulu, S. Y. Ryu,Y. Sada, T. Shibukawa,H. Shimizu, R. Shirai, K. Shiraishi, E. A. Strokovsky, Y. Sugaya, M. Sumihama, S. Suzuki,S. Tanaka, Y. Taniguchi, A. Tokiyasu, N. Tomida, Y. Tsuchikawa, T. Ueda, T. F. Wang, H. Yamazaki, R. Yamazaki, Y. Yanai, T. Yorita, C. Yoshida, M. Yosoi

PHYSICAL REVIEW C（2023）

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摘要

For the first time, differential cross sections and photon beam asymmetries were measured for the reaction gamma p -> f0(980) p -> pi 0 pi 0p by using a linearly polarized photon beam up to 2.4 GeV and a liquid hydrogen target. The f0(980) photoproduction signal was clearly observed owing to the absence of contributions from vector-meson photoproduction. The results indicate the t-channel exchange of vector mesons as a mechanism of the f0(980) photoproduction at E gamma approximate to 2.1 GeV, putting constraints on the nature of f0(980).

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