1206.1876 (J. Osvaldo Gonzalez-Hernandez et al.)

Interpretation of the Flavor Dependence of Nucleon Form Factors in a
Generalized Parton Distribution Model    [PDF]

J. Osvaldo Gonzalez-Hernandez, Simonetta Liuti, Gary R. Goldstein, Kunal Kathuria

We give an interpretation of the $u$ and $d$ quarks contributions to the nucleon electromagnetic form factors for values of the four-momentum transfer up to few GeV where flavor separated data have been recently made available. The data show, in particular, a suppression of $d$ quarks with respect to $u$ quarks at large momentum transfer. This trend can be explained using generalized parton distributions which provide a correlation between momentum and coordinate spaces, both of which are necessary in order to interpret the partonic substructure of the form factors. We show that a flavor dependence originates from both Regge and quark-diquark terms in our model.

View original: http://arxiv.org/abs/1206.1876