Generalized parton distributions of the nucleon in constituent quark models

2); (2) ECT; 3) ((1) University; (3) University of Trento); B. Pasquini (1; INFN; M. Traini (2; Pavia; S. Boffi (1); Trento

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Generalized parton distributions of the nucleon in constituent quark models

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arxiv hep-ph/0502140 v1 pith:EL6ZAKLS submitted 2005-02-15 hep-ph

S. Boffi (1) , B. Pasquini (1 , 2) , M. Traini (2 , 3) ((1) University , INFN , Pavia , (2) ECT

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Trento (3) University of Trento)

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keywords gpdsnonperturbativequarkconstituentdistributionsgeneralizedinvestigatemodel

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Generalized parton distributions (GPDs) are studied at the hadronic (nonperturbative) scale within different assumptions based on a relativistic constituent quark model. In particular, by means of a meson-cloud model we investigate the role of nonperturbative antiquark degrees of freedom and the valence quark contribution. A QCD evolution of the obtained GPDs is used to add perturbative effects and to investigate the GPDs' sensitivity to the nonperturbative ingredients of the calculation at larger (experimental) scale.

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