Positivity bounds on parton distributions at large N_c

Abstract

Positivity bounds for twist-two parton distributions in multicolored QCD are stronger than their analogs at finite $N_c$. They include the enhanced large $N_c$ version of Soffer inequality. These bounds are compatible with the DGLAP evolution to higher normalization points.

arXiv comment7 pages, to be published in the proceedings of "The Phenomenology of Large Nc QCD" workshop, 9-11 January 2002, Arizona State University, Tempe