Instanton contribution to the Sivers function

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dc.creatorCherednikov, I. O.
dc.creatorD'Alesio, U.
dc.creatorKochelev, N. I.
dc.creatorMurgia, F.
dc.date2006-06-22
dc.date2006-10-10
dc.date.accessioned2026-07-07T10:41:48Z
dc.date.available2026-07-07T10:41:48Z
dc.descriptionWe study the Sivers function for valence u and d quarks in the proton within the instanton model for QCD vacuum, adopting the MIT bag model wave functions for quarks. Within approaches based on perturbative one-gluon final state interactions a non-zero value of the Sivers function is related to the presence of both S and P wave components in quark wave functions. We show that the instanton-induced chromomagnetic, nonperturbative interaction leads to very specific spin-spin correlations between the struck and spectator quarks, resulting in a non-trivial flavour dependence of the Sivers function. Comparison of the obtained Sivers functions with phenomenological parameterizations is discussed.
dc.description1+12 pages, 4 ps figures; v2: few references and one sentence added in the introduction; final version published in Phys. Lett. B
dc.identifierhttps://arxiv.org/abs/hep-ph/0606238
dc.identifierhttp://arxiv.org/abs/hep-ph/0606238
dc.identifierPhys.Lett.B642:39-47,2006
dc.identifierdoi:10.1016/j.physletb.2006.09.019
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/181739
dc.subjectHigh Energy Physics - Phenomenology
dc.titleInstanton contribution to the Sivers function
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