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Title
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Instanton contribution to the Sivers function
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Author
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Abstract
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| We 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. (c) 2006 Elsevier B.V. All rights reserved. |
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Language
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English
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Source (journal)
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Physics letters : B. - Amsterdam, 1967, currens
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Publication
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Amsterdam
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North-Holland
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2006
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ISSN
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0370-2693
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DOI
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10.1016/J.PHYSLETB.2006.09.019
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Volume/pages
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642
:1-2
(2006)
, p. 39-47
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ISI
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000241971400009
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Full text (Publisher's DOI)
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Full text (open access)
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