Diffractive $\varphi$-meson photoproduction on proton near threshold

Abstract

Photoproduction of $\varphi$-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 $\varphi$-mesons are photo-produced predominantly by helicity-conserving processes, and the local maximum is not likely due to unnatural-parity processes.

6 pages, error on the cross sections were corrected, accepted for publication in Phys. Rev. Lett

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