KAON PRODUCTION VIA GAMMA-N-]K-SIGMA IN THE CHIRAL QUARK-MODEL

In this paper, we present a calculation of the four isospin channels o f the kaon photoproduction gamma N-->K Sigma in the framework of the c hiral quark model. The relative strength and phases in each isospin ch annel are determined by the quark model wave function with SU(6)xO(3) symmetry. The duality hypothesis is imposed to limit the number of the t channel exchanges. The only free parameter, the coupling constant g (K Sigma N), is fitted to the total cross section data in gamma p-->K( +)Sigma(0) channel. We found a remarkable agreement with the data avai lable in the other isospin channels, and it represents a dramatic impr ovement over the similar calculation in the traditional isobaric model .