Quark model analysis of the Sivers function

[en] We develop a formalism to evaluate the Sivers function. The approach is well suited for calculations which use constituent quark models to describe the structure of the nucleon. A nonrelativistic reduction of the scheme is performed and applied to the Isgur-Karl model of hadron structure. The results obtained are consistent with a sizable Sivers effect and the signs for the u and d flavor contributions turn out to be opposite. This pattern is in agreement with the one found analyzing, in the same model, the impact parameter dependent generalized parton distributions. The Burkardt sum rule turns out to be fulfilled to a large extent. We estimate the QCD evolution of our results from the momentum scale of the model to the experimental one and obtain reasonable agreement with the available data. © 2008 The American Physical Society.

Disciplines :

Physics

Author, co-author :

Courtoy, Aurore ; Departament de Fisica Teòrica, Universitat de València, Consejo Superior de Investigaciones Científicas, 46100 Burjassot (València), Spain

Fratini, F.; Dipartimento di Fisica, Università degli Studi di Perugia, via A. Pascoli, 06100 Perugia, Italy

Scopetta, S.; Dipartimento di Fisica, Università degli Studi di Perugia, via A. Pascoli, 06100 Perugia, Italy, INFN, Sezione di Perugia, via A. Pascoli, 06100 Perugia, Italy

Vento, V.; Departament de Fisica Teòrica, Universitat de València, Consejo Superior de Investigaciones Científicas, 46100 Burjassot (València), Spain, TH-Division, PH Department, CERN, CH-1211 Genève 23, Switzerland

Language :

English

Title :

Quark model analysis of the Sivers function

Publication date :

2008

Journal title :

Physical Review. D, Particles, Fields, Gravitation, and Cosmology

ISSN :

1550-7998

eISSN :

1550-2368

Publisher :

American Physical Society, College Park, United States - Maryland

Volume :

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 11 July 2012

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