Nondiagonal Parton Distributions in the Leading Logarithmic Approximation

Abstract

In this paper we make predictions for nondiagonal parton distributions in a proton in the LLA. We calculate the DGLAP-type evolution kernels in the LLA, solve the nondiagonal GLAP evolution equations with a modified version of the CTEQ-package and comment on the range of applicability of the LLA in the asymmetric regime. We show that the nondiagonal gluon distribution $g(x_1,x_2,t,\hat{I}{¼}^2)$ can be well approximated at small $x$ by the conventional gluon density $xG(x,\hat{I}{¼}^2)$. Keywords: Hard Diffractive Scattering, Nondiagonal distributions, Evolution

20 pages, RevTex. Final version with updated figures. Published in Phys. Lett. B