Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-04-09
Phys.Lett.B671:153-157,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 4 figures. Changed .sty, and added more details. PLB in press
Scientific paper
10.1016/j.physletb.2008.11.056
For 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 $\chi^2/datum \sim 1.7$), 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 $q^2 \sim 8.0 (GeV/c)^2$
de Melo P. B. C. J.
Frederico Tobias
Pace Emanuele
Pisano Silvia
Salme` Giovanni
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