$ω$ and $ρ$ Photoproduction with an Effective Quark Model Lagrangian

Abstract

An unified approach for vector meson photoproduction is presented in the constit quark model. The s- and u-channel resonance contributions are generated using an effective quark vector-meson Lagrangian. In addition, taking into account $π^0$ and $σ$ t-channel exchanges for diffractive production, the available total and differential cross section data for $ω$, $ρ^0$, $ρ^+$, and $ρ^-$ photoproduction can be well described with the same quark model parameter set. Our results clearly indicate that polarization observables are essential to identify so-called "missing" resonances.

7 pages, 3 PS figures, submitted to PRL