Scale dependence of twist-three contributions to single spin asymmetries

Details Scale dependence of twist-three contributions to single spin asymmetries Scale dependence of twist-three contributions to single spin asymmetries

2009-09-18

arxiv.org/abs/0909.3410v2

Phys.Rev.D80:114002,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

14pages, 4 figures, published version

Scientific paper

10.1103/PhysRevD.80.114002

We reexamine the scale dependence of twist-three correlation functions relevant for the single transverse spin asymmetry in the framework of collinear factorization. Evolution equations are derived for both the flavor-nonsinglet and flavor--singlet distributions and arbitrary parton momenta. Our results do not agree with the recent calculations of the evolution in the limit of vanishing gluon momentum. Possible sources for this discrepancy are identified.

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