An Unified Approach To Pseudo Scalar Meson Photoproductions Off Nucleons In The Quark Model

Abstract

An unified approach to the pseudo scalar meson ($\pi ,\eta$, and $K$) photoproduction off nucleons are presented. It begins with the low energy QCD Lagrangian, and the resonances in the s- and u- channels are treated in the framework of the quark model The duality hypothesis is imposed to limit the number of the t-channel exchanges. The CGLN amplitudes for each reaction are evaluated, which include both proton and neutron targets. The important role by the S-wave resonances in the second resonance region is discussed, it is particularly important for the $K,\eta$ and ${\eta }^{\prime }$ photoproductions.

31 pages in Latex file

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