6533b82efe1ef96bd12945ae

RESEARCH PRODUCT

The role of vector-baryon channels and resonances in the γp→K0Σ+ and γn→K0Σ0 reactions near the K⁎Λ threshold

Angels RamosEulogio Oset

subject

Scattering cross-sectionPhysicsNuclear and High Energy Physics010308 nuclear & particles physicsResonance01 natural sciencesBaryonFormalism (philosophy of mathematics)Amplitude0103 physical sciencesIntermediate stateVector mesonAtomic physics010306 general physicsNuclear theory

description

Abstract We have studied the γ p → K 0 Σ + reaction in the energy region around the K ⁎ Λ and K ⁎ Σ 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 ⁎ Λ and K ⁎ Σ 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 γ n → K 0 Σ 0 reaction, the measurement of which would test the mechanism proposed in this work.

https://doi.org/10.1016/j.physletb.2013.10.012