Scale Dependence of Twist-3 Quark-Gluon Operators for Single Spin Asymmetries
High Energy Physics - Phenomenology
2015-06-05 v2 High Energy Physics - Experiment
Abstract
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.
Keywords
Cite
@article{arxiv.1205.0611,
title = {Scale Dependence of Twist-3 Quark-Gluon Operators for Single Spin Asymmetries},
author = {J. P. Ma and Q. Wang},
journal= {arXiv preprint arXiv:1205.0611},
year = {2015}
}
Comments
typo in Eq.(10) corrected, references added