Scale Dependence of Twist-3 Quark-Gluon Operators for Single Spin Asymmetries

J. P. Ma; Q. Wang

Scale Dependence of Twist-3 Quark-Gluon Operators for Single Spin Asymmetries

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arxiv 1205.0611 v2 pith:OHP75FJ5 submitted 2012-05-03 hep-ph hep-ex

J. P. Ma , Q. Wang This is my paper · ORCID

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We derive the scale dependence of twist-3 quark-gluon operators, or ETQS matrix elements, at one-loop. These operators are used to factorize transverse single spin asymmetries, which are studied intensively both in experiment and theory. The scale dependence of two special cases are particularly interesting. One is of soft-gluon-pole matrix elements, another is of soft-quark-pole matrix elements. From our results the evolutions in the two cases can be obtained. A comparison with existing results of soft-gluon-pole matrix elements is made.

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