Nuclear Modification to Parton Distribution Functions and Parton Saturation

Abstract

We introduce a generalized definition of parton distribution functions (PDFs) for a more consistent all-order treatment of power corrections. We present a new set of modified DGLAP evolution equations for nuclear PDFs, and show that the resummed ${\alpha }_s{A}^{1/3}/Q^2$-type of leading nuclear size enhanced power corrections significantly slow down the growth of gluon density at small-$x$. We discuss the relation between the calculated power corrections and the saturation phenomena.

Comments: 4 pages, to appear in the proceedings of QM2006