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

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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.
final version, to appear in Phys. Lett. B

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High Energy Physics - Phenomenology

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http://salesiana.dossiersoluciones.com/handle/123456789/182664

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/hep-ph/0601133
 http://arxiv.org/abs/hep-ph/0601133
 Phys.Lett.B637:241-244,2006
 doi:10.1016/j.physletb.2006.05.004

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