Journal
PHYSICS LETTERS B
Volume 637, Issue 4-5, Pages 241-244Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2006.05.004
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The Sivers mechanism gives rise to a non-zero average transverse momentum of partons inside a transversely polarized target. According to a sum rule of Burkardt this transverse momentum vanishes when summing over all partons. We explicitly check the Burkardt sum rule by means of one-loop calculations for a quark target in perturbative QCD and for a diquark spectator model of the nucleon. In both cases the sum rule is fulfilled. (c) 2006 Elsevier B.V. All rights reserved.
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