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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)
Reaccions nuclears
Mesons (Nuclear physics)
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:
It is part of: Physics Letters B, 2013, vol. 727, num. 1-3, p. 287-292
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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