Quark Orbital Angular Momentum in the Wandzura-Wilczek Approximation

Details Quark Orbital Angular Momentum in the Wandzura-Wilczek Approximation Quark Orbital Angular Momentum in the Wandzura-Wilczek Approximation

2003-10-10

arxiv.org/abs/hep-ph/0310136v2

Phys.Lett. B582 (2004) 55-63

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages; Several points clarified, 3 references added, to be published in PLB

Scientific paper

10.1016/j.physletb.2003.11.076

We show that quark orbital angular momentum is directly related to off-forward correlation functions which include intrinsic transverse momentum corresponding to a derivative with respect to the transverse coordinates. Its possible contribution to scattering processes is therefore of higher twist and vanishes in the forward limit. The relation of OAM to other twist 2 and 3 distributions known in the literature is derived and formalized by an unintegrated sum rule.

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