Checking the Burkardt sum rule for the Sivers function by model calculations

Details Checking the Burkardt sum rule for the Sivers function by model calculations Checking the Burkardt sum rule for the Sivers function by model calculations

2006-01-17

arxiv.org/abs/hep-ph/0601133v2

Phys.Lett.B637:241-244,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

final version, to appear in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2006.05.004

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.

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