2 research outputs found
The role of vector-baryon channels and resonances in the Ī³pāK0Ī£+ and Ī³nāK0Ī£0 reactions near the K*Ī threshold
We have studied the Ī³pāK0Ī£+ reaction in the energy region around the K*Ī and K*Ī£ 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*Ī and K*Ī£ 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 Ī³nāK0Ī£0 reaction, the measurement of which would test the mechanism proposed in this work
The role of vector-baryon channels and resonances in the gamma p to K0 Sigma+ and gamma n to K0 Sigma0 reactions near the K* Lambda threshold
We have studied the Ī³pāK0Ī£+Ī³pāK0Ī£+ reaction in the energy region around the KāĪKāĪ and KāĪ£KāĪ£ 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 KāĪKāĪ and KāĪ£KāĪ£ intermediate states. The sharp downfall is dictated by the presence of a nearby NāNā resonance produced by our model, a feature that we have employed to predict its properties. We also show results for the complementary Ī³nāK0Ī£0Ī³nāK0Ī£0 reaction, the measurement of which would test the mechanism proposed in this work