Sivers function in a spectator model with axial-vector diquarks

Details Sivers function in a spectator model with axial-vector diquarks Sivers function in a spectator model with axial-vector diquarks

2003-09-22

arxiv.org/abs/hep-ph/0309246v3

Phys.Lett. B578 (2004) 109-118

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 7 figures, uses RevTex, added calculation of h1^perp, final version accepted for publication in PLB

Scientific paper

We perform a calculation of the Sivers function in a spectator model of the nucleon, with scalar and axial-vector diquarks. We make use of gluon rescattering to produce the nontrivial phases necessary to generate the Sivers function. The inclusion of axial-vector diquarks enables us to obtain a nonzero Sivers function for down quarks. Using the results of our model, we discuss the phenomenology of transvere single spin asymmetries in pi+, pi-, and pi0 production, which are currently analysed by the HERMES and COMPASS collaborations. We find that the inclusion of axial-vector diquarks substantially reduces the asymmetries.

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