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We have studied the $\gamma p \to K^0 \Sigma^+$ reaction in the energy regionaround the $K^* \Lambda$ and $K^* \Sigma$ thresholds, where the CBELSA/TAPScross section shows a sudden drop and the differential cross sectionexperiences a transition from a forward-peaked distribution to a flat one. Ourcoupled channel model incorporates the dynamics of the vector meson-baryoninteraction which is obtained from the hidden gauge formalism. We find that thecross section in this energy region results from a delicate interferencebetween amplitudes having $K^* \Lambda$ and $K^*\Sigma$ intermediate states.The sharp downfall is dictated by the presence of a nearby $N^*$ resonanceproduced by our model, a feature that we have employed to predict itsproperties. We also show results for the complementary $\gamma n \to K^0\Sigma^0$ reaction, the measurement of which would test the mechanism proposedin this work.

physics letters b

The role of vector-baryon channels and resonances in the $\gamma p \to  K^0 \Sigma^+$ and $\gamma n \to K^0 \Sigma^0$ reactions near the $K^*  \Lambda$ threshold