Photoproduction of a 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 photoproduced predominantly by helicity-conserving processes, and the local maximum is not likely due to unnatural-parity processes.
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Mibe et al. (2005) studied this question.
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