Spin and angular momentum in the nucleon

descriptionPublicationkeyboard_double_arrow_right Article , Preprint 14 May 2012Embargo end date: 01 Jan 2012 United States English Publisher:American Physical Society (APS)Journal:Physical Review D, volume 85 (issn: 1550-7998, eissn: 1550-2368,

Copyright policy )Funded by:FCT | ELECTROMAGNETIC PROBES AT..., FCT | Hadron structure with rel...

Authors: Franz Gross; Gilberto Ramalho; Teresa Pena;

doi: 10.1103/physrevd.85.093006 , 10.48550/arxiv.1201.6337

arXiv: 1201.6337

Spin and angular momentum in the nucleon

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Abstract

Using the covariant spectator theory (CST), we present the results of a valence quark-diquark model calculation of the nucleon structure function f(x) measured in unpolarized deep inelastic scattering (DIS), and the structure functions g1(x) and g2(x) measured in DIS using polarized beams and targets. Parameters of the wave functions are adjusted to fit all the data. The fit fixes both the shape of the wave functions and the relative strength of each component. Two solutions are found that fit f(x) and g1(x), but only one of these gives a good description of g2(x). This fit requires the nucleon CST wave functions contain a large D-wave component (about 35%) and a small P-wave component (about 0.6%). The significance of these results is discussed.

27 pages; 13 figures

Country

United States

Related Organizations

University of Lisbon
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Keywords

Polarized Beams, Targets, Nuclear Theory, Deep Inelastic Scattering, Quark Model, Quarks, Shape, FOS: Physical sciences, Angular Momentum, 530, 72 Physics Of Elementary Particles And Fields, Wave Functions, Nuclear Theory (nucl-th), High Energy Physics - Phenomenology, Spin, Valence, High Energy Physics - Phenomenology (hep-ph), Structure Functions, Nucleons

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