Non-diffractive mechanisms in the $ϕ$ meson photoproduction on nucleons

Abstract

We examine the non-diffractive mechanisms in the $ϕ$ meson photoproduction from threshold up to a few GeV using an effective Lagrangian in a constituent quark model. The new data from CLAS at large angles can be consistently accounted for in terms of {\it s}- and {\it u}-channel processes. Isotopic effects arising from the reactions $γp\to ϕp$ and $γn\to ϕn$, are investigated by comparing the cross sections and polarized beam asymmetries. Our result highlights an experimental means of studying non-diffractive mechanisms in $ϕ$ meson photoproduction.