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arxiv: nucl-ex/0506015 · v3 · submitted 2005-06-10 · ⚛️ nucl-ex

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\'
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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
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keywords gammalocalmaximummesonphotoproductionprocessesthresholdangles
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Photoproduction of $\phi$-meson on protons was studied by means of linearly polarized photons at forward angles in the low-energy region from threshold to $E_{\gamma}$= 2.37 GeV. The differential cross sections at $t = -|t|_{min}$ do not increase smoothly as $E_{\gamma}$ increases, but show a local maximum at around 2.0 GeV. The angular distributions demonstrate that $\phi$-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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