Diffractive $ϕ$-meson photoproduction on proton near threshold

T. Mibe; W. C. Chang; T. Nakano; D. S. Ahn; J. K. Ahn; H. Akimune; Y. Asano; S. Date\'; H. Ejiri; H. Fujimura; M. Fujiwara; K. Hicks; T. Hotta; K. Imai; T. Ishikawa; T. Iwata; H. Kawai; Z. Y. Kim; K. Kino; H. Kohri; N. Kumagai; S. Makino; T. Matsuda; 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. S. Oshuev; C. Rangacharyulu; A. Sakaguchi; T. Sasaki; P. M. Shagin; Y. Shiino; H. Shimizu; Y. Sugaya; M. Sumihama; A. I. Titov; Y. Toi; H. Toyokawa; A. Wakai; C. W. Wang; S. C. Wang; K. Yonehara; T. Yorita; M. Yoshimura; M. Yosoi; R. G. T. Zegers

doi:10.1103/physrevlett.95.182001

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Diffractive $ϕ$-meson photoproduction on proton near threshold

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Abstract

Photoproduction of $ϕ$-meson on protons was studied by means of linearly polarized photons at forward angles in the low-energy region from threshold to $E_γ$= 2.37 GeV. The differential cross sections at $t = -|t|_{min}$ do not increase smoothly as $E_γ$ increases, but show a local maximum at around 2.0 GeV. The angular distributions demonstrate that $ϕ$-mesons are photo-produced predominantly by helicity-conserving processes, and the local maximum is not likely due to unnatural-parity processes.

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T. Mibe, W. C. Chang, T. Nakano, D. S. Ahn, J. K. Ahn, H. Akimune, Y. Asano, S. Date\', H. Ejiri, H. Fujimura, M. Fujiwara, K. Hicks, T. Hotta, K. Imai, T. Ishikawa, T. Iwata, H. Kawai, Z. Y. Kim, K. Kino, H. Kohri, N. Kumagai, S. Makino, T. Matsuda, 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. S. Oshuev, C. Rangacharyulu, A. Sakaguchi, T. Sasaki, P. M. Shagin, Y. Shiino, H. Shimizu, Y. Sugaya, M. Sumihama, A. I. Titov, Y. Toi, H. Toyokawa, A. Wakai, C. W. Wang, S. C. Wang, K. Yonehara, T. Yorita, M. Yoshimura, M. Yosoi, R. G. T. Zegers. 2005-10-10. Diffractive $ϕ$-meson photoproduction on proton near threshold. https://doi.org/10.1103/physrevlett.95.182001

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