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 γp→K0Σ+γp→K0Σ+ reaction in the energy region around the K⁎ΛK⁎Λ and K⁎ΣK⁎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 in...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2013 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/107266 |
| Acceso en línea: | https://hdl.handle.net/2445/107266 |
| Access Level: | acceso abierto |
| Palabra clave: | Mesons (Física nuclear) Barions Reaccions nuclears Mesons (Nuclear physics) Baryons Nuclear reactions |
| Sumario: | We have studied the γp→K0Σ+γp→K0Σ+ reaction in the energy region around the K⁎ΛK⁎Λ and K⁎ΣK⁎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⁎ΛK⁎Λ and K⁎ΣK⁎Σ intermediate states. The sharp downfall is dictated by the presence of a nearby N⁎N⁎ resonance produced by our model, a feature that we have employed to predict its properties. We also show results for the complementary γn→K0Σ0γn→K0Σ0 reaction, the measurement of which would test the mechanism proposed in this work. |
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