Nondiagonal Parton Distribution in the Leading Logarithmic Approximation

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 $x_{2}G(x_{1},x_{2},Q^2)$ can be well approximated at small $x$ by the conventional gluon density $xG(x,Q^2)$ and explain that the cross sections of hard diffractive processes are determined by $x_{2}G(x_{1},x_{2})$.