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Nonlinear evolution equation at small x with impact parameter dependence isanalyzed numerically. Saturation scales and the radius of expansion in impactparameter are extracted as functions of rapidity. Running coupling is includedin this evolution, and it is found that the solution is sensitive to theinfrared regularization. Kinematical effects beyond leading logarithmicapproximation are taken partially into account by modifying the kernel whichincludes the rapidity dependent cuts. While the local nonlinear evolution isnot very sensitive to these effects, the kinematical constraints cannot beneglected in the evolution with impact parameter.

Numerical solution of the nonlinear evolution equation at small x with impact parameter and beyond the LL approximation