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

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dc.contributor	Universitat de Barcelona
dc.contributor.author	Ramos Gómez, Àngels
dc.contributor.author	Oset Baguena, Eulogio
dc.date	2017-02-22T15:23:43Z
dc.date	2017-02-22T15:23:43Z
dc.date	2013-11
dc.date	2017-02-22T15:23:43Z
dc.identifier.citation	0370-2693
dc.identifier.citation	630183
dc.identifier.uri	http://hdl.handle.net/2445/107266
dc.format	6 p.
dc.format	application/pdf
dc.language.iso	eng
dc.publisher	Elsevier B.V.
dc.relation	info:eu-repo/semantics/altIdentifier/doi/10.1016/j.physletb.2013.10.012
dc.relation	Versió postprint del document publicat a: https://doi.org/10.1016/j.physletb.2013.10.012
dc.relation	Physics Letters B, 2013, vol. 727, num. 1-3, p. 287-292
dc.relation	https://doi.org/10.1016/j.physletb.2013.10.012
dc.relation	info:eu-repo/grantAgreement/EC/FP7/283286/EU//HADRONPHYSICS3
dc.rights	cc-by-nc-nd (c) Elsevier B.V., 2013
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	http://creativecommons.org/licenses/by-nc-nd/3.0/es
dc.subject	Mesons (Física nuclear)
dc.subject	Barions
dc.subject	Reaccions nuclears
dc.subject	Mesons (Nuclear physics)
dc.subject	Baryons
dc.subject	Nuclear reactions
dc.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
dc.type	info:eu-repo/semantics/article
dc.type	info:eu-repo/semantics/acceptedVersion
dc.description.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.

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