Applying a 0-jettiness veto to transverse single-spin asymmetries in W/Z production at RHIC enhances the asymmetry signal, sharpening the test of the Sivers sign change.
Scale Dependence of Twist-3 Quark-Gluon Operators for Single Spin Asymmetries
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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.
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Nucleon Tomography with 0-jettiness
Applying a 0-jettiness veto to transverse single-spin asymmetries in W/Z production at RHIC enhances the asymmetry signal, sharpening the test of the Sivers sign change.