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Title: | 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 |
Author: | Ramos Gómez, Àngels Oset Baguena, Eulogio |
Keywords: | Mesons (Física nuclear) Barions Reaccions nuclears Mesons (Nuclear physics) Baryons Nuclear reactions |
Issue Date: | Nov-2013 |
Publisher: | Elsevier B.V. |
Abstract: | 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. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1016/j.physletb.2013.10.012 |
It is part of: | Physics Letters B, 2013, vol. 727, num. 1-3, p. 287-292 |
URI: | http://hdl.handle.net/2445/107266 |
Related resource: | https://doi.org/10.1016/j.physletb.2013.10.012 |
ISSN: | 0370-2693 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) Publicacions de projectes de recerca finançats per la UE |
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