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We discuss the Wilson renormalization group approach to the effective action for low x physics. It is shown that in the linearized, weak field regime the RG equation reduces to the BFKL equation for the evolution of the unintegrated gluon density. We discuss the relation of this approach with that of Lipatov.

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We consider the production of high transverse momentum gluons in the McLerranVenugopalan model of nuclear structure functions. We explicitly compute the high momentum component in this model. We compute the nuclear target size A dependence of the distribution of produced gluons.

We continue the study of the effective action for low x physics based on a Wilson renormalization group approach. We express the full nonlinear renormalization group equation in terms of the average value and the average fluctuation of extra color charge density generated by integrating out gluons with intermediate values of x. This form clearly exhibits the nature of the phenomena driving the evolution and should serve as the basis of the analysis of saturation effects at high gluon density at small x. * On leave from PPARC Advanced Fellowship.