Kaon production via γN→KΣ in the chiral quark model

In this paper, we present a calculation of the four isospin channels of the kaon photoproduction γN→KΣ in the framework of the chiral quark model. The relative strength and phases in each isospin channel are determined by the quark model wave function with SU(6)⊗O(3) symmetry. The duality hypothesis is imposed to limit the number of the t channel exchanges. The only free parameter, the coupling constant g_KΣN, is fitted to the total cross section data in γp→K⁺Σ⁰ channel. We found a remarkable agreement with the data available in the other isospin channels, and it represents a dramatic improvement over the similar calculation in the traditional isobaric model.