Study $ω$ and $ϕ$ photoproduction in the nucleon isotopic channels

Abstract

We present results for the photoproduction of $ω$ and $ϕ$ meson in the nucleon isotopic channles. A recently developed quark model with an effective Lagrangian is employed to account for the non-diffractive {\it s}- and {\it u}-channel processes; the diffractive feature arising from the {\it natural} parity exchange is accounted for by the {\it t}-channel pomeron exchange, while the {\it unnatural} parity exchange is accounted for by the {\it t}-channel pion exchange. In the $ω$ production, the isotopic effects could provide more information concerning the search of "missing resonances", while in the $ϕ$ production, the isotopic effects could highlight non-diffractive resonance excitation mechanisms at large angles.