Light-Ray Evolution Equations and Leading-Twist Parton Helicity-Dependent Nonforward Distributions

Abstract

We discuss the calculation of the evolution kernels \Delta W_{\zeta}(X,Z) for the leading-twist nonforward parton distributions G_\zeta(X,t) sensitive to parton helicities. We present our results for the kernels governing evolution of the relevant light-ray operators and describe a simple method allowing to obtain from them the components of the nonforward kernels \Delta W_{\zeta}(X,Z).

Comments: 8 pages; final version, to appear in Physics Letters B