Valence quark and meson cloud contributions for the γ*Λ→Λ* and γ*Σ⁰→Λ* reactions

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dc.contributor.authorRamalho, G.
dc.contributor.authorJido, D.
dc.contributor.authorTsushima, K.
dc.date.issued2012
dc.description.abstractWe estimate the valence quark contributions for the γ*Y→Λ* (Y=Λ, Σ0) electromagnetic transition form factors. We focus particularly on the case of Λ*=Λ(1670) as an analogue reaction with γ*N→N(1535). The results are compared with those obtained from chiral unitary model, where the Λ* resonance is dynamically generated and thus the electromagnetic structure comes directly from the meson cloud excitation of the baryon ground states. The form factors for the case Y=Σ0 in particular, depend crucially on the two real phase (sign) combination, a phase between the Λ and Λ* states, and the other, the phase between the Λ and Σ0 radial wave functions. Depending on the combination of these two phases, the form factors for the γ*Σ0→Λ* reaction can be enhanced or suppressed. Therefore, there is a possibility to determine the phase combination by experiments.
dc.description.statementofresponsibilityG. Ramalho, D. Jido, and K. Tsushima
dc.identifier.citationPhysical Review D: Particles, Fields, Gravitation and Cosmology, 2012; 85(9):1-17
dc.identifier.doi10.1103/PhysRevD.85.093014
dc.identifier.issn1550-7998
dc.identifier.issn1550-2368
dc.identifier.urihttp://hdl.handle.net/2440/74167
dc.language.isoen
dc.publisherAmerican Physical Soc
dc.relation.granthttp://purl.org/au-research/grants/arc/FL0992247
dc.relation.grant22740161
dc.relation.grant22105507
dc.rights© 2012 American Physical Society
dc.source.urihttps://doi.org/10.1103/physrevd.85.093014
dc.titleValence quark and meson cloud contributions for the γ*Λ→Λ* and γ*Σ⁰→Λ* reactions
dc.title.alternativeValence quark and meson cloud contributions for the gamma*lambda ->lambda* and gamma*sigma(0)->lambda* reactions
dc.typeJournal article
pubs.publication-statusPublished

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