QCD at small x and nucleus-nucleus collisions

Abstract

At large collision energy sqrt(s) and relatively low momentum transfer Q, one expects a new regime of Quantum Chromo-Dynamics (QCD) known as "saturation". This kinematical range is characterized by a very large occupation number for gluons inside hadrons and nuclei; this is the region where higher twist contributions are as large as the leading twist contributions incorporated in collinear factorization. In this talk, I discuss the onset of and dynamics in the saturation regime, some of its experimental signatures, and its implications for the early stages of Heavy Ion Collisions.

Plenary talk given at QM2006, Shanghai, November 2006. 8 pages, 8 figures

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• Are there monojets in high-energy proton-nucleus collisions?