Quark model analysis of the Sivers function

Journal Article · Fri Aug 01 04:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.78.034002· OSTI ID:21250606

Courtoy, A ^[1]; Fratini, F ^[2]; Scopetta, S ^[2]; Vento, V ^[1]

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1. Departament de Fisica Teorica, Universitat de Valencia and Institut de Fisica Corpuscular, Consejo Superior de Investigaciones Cientificas 46100 Burjassot (Valencia) (Spain)
2. Dipartimento di Fisica, Universita degli Studi di Perugia, via A. Pascoli 06100 Perugia (Italy)

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.

• OSTI ID: 21250606
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 3 Vol. 78; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DISTRIBUTION
EVOLUTION
FLAVOR MODEL
IMPACT PARAMETER
NUCLEONS
QUANTUM CHROMODYNAMICS
QUARK MODEL
SIMULATION
SUM RULES