Nonperturbative versus perturbative effects in generalized parton distributions

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

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Nonperturbative versus perturbative effects in generalized parton distributions

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arxiv hep-ph/0407228 v3 submitted 2004-07-20 hep-ph

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

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Trento (3) Trento University Trento)

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keywords nonperturbativegpdsdistributionseffectsgeneralizedinvestigatemodelparton

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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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