Fate of k_perp-factorization for hard processes in nuclear environment

Abstract

Large thickness of heavy nuclei brings in a new scale into the pQCD description of hard processes in nuclear environment. The familiar linear $k_{\perp }$-factorization breaks down and must be replaced by a new concept of the nonlinear $k_{\perp }$-factorization introduced in \cite{Nonlinear}. I demonstrate the salient features of nonlinear $k_{\perp }$-factorization on an example of hard dijet production in DIS off heavy nuclei. I also discuss briefly the non-linear BFKL evolution for gluon density of nuclei.

Comments: 5 papges, 3 figures, Invited talk at DIFFRACTION 2004 International Workshop on Diffraction in High-Energy Physics, Cala Gonone, Sardinia, ITALY, September 18 - 23, 2004