The role of vector-baryon channels and resonances in the gamma p -%26gt; K-0 Sigma(+) and gamma n -%26gt; K-0 Sigma(0) reactions near the K*Lambda threshold

作者：Ramos A^*; Oset E

来源：Physics Letters B, 2013, 727(1-3): 287-292.

DOI：10.1016/j.physletb.2013.10.012

We have studied the gamma p -%26gt; K-0 Sigma(+) reaction in the energy region around the K*Lambda and K*Sigma thresholds, where the CBELSA/TAPS cross section shows a sudden drop and the differential cross section experiences a transition from a forward-peaked distribution to a flat one. Our coupled-channel model incorporates the dynamics of the vector meson-baryon interaction which is obtained from the hidden gauge formalism. We find that the cross section in this energy region results from a delicate interference between amplitudes having K*Lambda and K*Sigma intermediate states. The sharp downfall is dictated by the presence of a nearby N* resonance produced by our model, a feature that we have employed to predict its properties. We also show results for the complementary gamma n -%26gt; K-0 Sigma(0) reaction, the measurement of which would test the mechanism proposed in this work.

• 出版日期2013-11