5 research outputs found
Scale Dependence of Twist-3 Quark-Gluon Operators for Single Spin Asymmetries
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.Comment: typo in Eq.(10) corrected, references adde
Gluon saturation: survival probability for leading neutrons in DIS
In this paper we discuss the example of one rapidity gap process: the
inclusive cross sections of the leading neutrons in deep inelastic scattering
with protons (DIS). The equations for this process are proposed and solved,
giving the example of theoretical calculation of the survival probability for
one rapidity gap processes. It turns out that the value of the survival
probability is small and it decreases with energyComment: 22pp, 15 figures in eps file
Double spin asymmetry A_{LT} in direct photon production
We study the longitudinal-transverse double spin asymmetry for
direct photon production in nucleon-nucleon scattering by using the collinear
twist-3 approach. This asymmetry, which, for instance, could be measured at
RHIC, contains a complete set of collinear twist-3 correlation functions in a
transversely polarized nucleon.Comment: 9 pages, 1 figur