Abstract
We have studied the γp→K0Σ+ 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 γn→K0Σ0 reaction, the measurement of which would test the mechanism proposed in this work.
Highlights
The recent work reported by the CBELSA/TAPS collaboration [1] puts a challenge to the ordinary models of photopro√duction of mesons
The reaction is γp → K0Σ+, whic√h exhibits a peak in the cross section around s = 1900 MeV followed by a fast downfall around s = 2000 MeV
We have estimated that the size of the linear momentum terms neglected here to be about 15% of the dominant contributions to the V B → V ′B′ interaction
Summary
The recent work reported by the CBELSA/TAPS collaboration [1] puts a challenge to the ordinary models of photopro√duction of mesons. Our model implements the vector-baryon interaction for vectors of the nonet with the octet of baryons obtained in [9], using the local hidden gauge Lagrangians [10,11,12] and coupled channels in an unitary approach. 3/2− resonances, degenerate in spin-parity, one of which appears around 1970 MeV and couples to ρN , ωN , φN but mostly to K∗Λ and K∗Σ The fact that this resonance appears close to the location of the downfall of the cross section suggests that any realistic theoretical scheme trying to reproduce this problem should consider the explicit incorporation of these channels and their interaction, as done in the present work. A measurement of the neutral reaction could bring further light into the physics hidden in these processes
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