Diffractive phi-meson photoproduction on proton near threshold
/ Authors
T. Mibe, T. Mibe, We-Fu Chang, T. Nakano, D. S. Ahn, D. S. Ahn, J. Ahn, H. Akimune, Y. Asano, S. Daté
and 51 more authors
H. Ejiri, H. Fujimura, M. Fujiwara, M. Fujiwara, K. Hicks, T. Hotta, K. Imai, Takatsugu Ishikawa, Takahiro Iwata, H. Kawai, Z. Kim, K. Kino, H. Kohri, N. Kumagai, S. Makino, T. Matsuda, T. Matsumura, T. Matsumura, N. Matsuoka, K. Miwa, M. Miyabe, Y. Miyachi, M. Morita, N. Muramatsu, M. Niiyama, M. Nomachi, Y. Ohashi, T. Ooba, H. Ohkuma, D. Oshuev, C. Rangacharyulu, A. Sakaguchi, T. Sasaki, P. Shagin, Y. Shiino, H. Shimizu, Y. Sugaya, Y. Sugaya, M. Sumihama, M. Sumihama, A. Titov, Y. Toi, H. Toyokawa, A. Wakai, Chun-Chieh Wang, S. C. Wang, K. Yonehara, T. Yorita, M. Yoshimura, M. Yosoi, R. Zegers
/ Abstract
Photoproduction of a {phi} meson on protons was studied by means of linearly polarized photons at forward angles in the low-energy region from threshold to E{sub {gamma}}=2.37 GeV. The differential cross sections at t=- vertical bar t vertical bar{sub min} do not increase smoothly as E{sub {gamma}} increases but show a local maximum at around 2.0 GeV. The angular distributions demonstrate that {phi} mesons are photoproduced predominantly by helicity-conserving processes, and the local maximum is not likely due to unnatural-parity processes.
Journal: Physical Review Letters