Time- and Spacelike Nucleon Electromagnetic Form Factors beyond Relativistic Constituent Quark Models

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dc.creatorde Melo, J. P. B. C.
dc.creatorFrederico, T.
dc.creatorPace, E.
dc.creatorPisano, S.
dc.creatorSalmè, G.
dc.date2008-04-09
dc.date2008-12-09
dc.date.accessioned2026-07-07T12:41:24Z
dc.date.available2026-07-07T12:41:24Z
dc.descriptionFor the first time, a phenomenological analysis of the experimental electromagnetic form factors of the nucleon, both in the timelike and spacelike regions, is performed by taking into account the effects of nonvalence components in the nucleon state, within a light-front framework. Our model, based on suitable Ansatzes for the nucleon Bethe-Salpeter amplitude and a microscopic version of the well-known Vector Meson Dominance model, has only four free parameters (determined by the spacelike data with $χ^2/datum \sim 1.7$), and yields a nice description of the experimental electromagnetic form factors in the physical region in the range $-30 (GeV/c)^2 < q^2 < 20 (GeV/c)^2$, except for the neutron one in the timelike region. Valuable information can be gained in the timelike region on possible missing Vector Mesons around $q^2 \sim 4.5 (GeV/c)^2$ and $q^2 \sim 8.0 (GeV/c)^2$
dc.description11 pages, 4 figures. Changed .sty, and added more details. PLB in press
dc.identifierhttps://arxiv.org/abs/0804.1511
dc.identifierhttp://arxiv.org/abs/0804.1511
dc.identifierPhys.Lett.B671:153-157,2009
dc.identifierdoi:10.1016/j.physletb.2008.11.056
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/219760
dc.subjectHigh Energy Physics - Phenomenology
dc.titleTime- and Spacelike Nucleon Electromagnetic Form Factors beyond Relativistic Constituent Quark Models
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