Sivers Asymmetry for the proton and the neutron

Details Sivers Asymmetry for the proton and the neutron Sivers Asymmetry for the proton and the neutron

2008-07-14

arxiv.org/abs/0807.2189v1

AIPConf.Proc.1056:114-121,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 3 figures, Invited talk at the "6th International Conference on Hadronic Physics", ICTP, Trieste, Italy, 12-16 May 20

Scientific paper

10.1063/1.3013030

A formalism is presented to evaluate the Sivers function in constituent quark models. A non-relativistic reduction of the scheme is performed and applied to the Isgur-Karl model. 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. The Burkardt Sum Rule is fulfilled to a large extent. After the estimate of the QCD evolution of the results from the momentum scale of the model to the experimental one, a reasonable agreement with the available data is obtained. A calculation of nuclear effects in the extraction of neutron single spin asymmetries in semi-inclusive deep inelastic scattering off 3He is also described. In the kinematics of forth-coming experiments at JLab, it is found that the nuclear effects arising within an Impulse Approximation approach are under control.

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