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Instanton contribution to the Sivers function
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DOI：10.1016/j.physletb.2006.09.019.png)
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摘要
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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.
Keyword:
SINGLE-SPIN ASYMMETRIES
FINAL-STATE INTERACTIONS
HARD-SCATTERING
GAUGE
MODEL
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4.5
论文数:
3.2W
被引数:
7.3W
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