Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-10-31
ActaPhys.Polon.B37:3477-3510,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 16 figures, invited lectures at the Cracow School of Theoretical Physics, Zakopane, June 2006
Scientific paper
In these proceedings, I shall review the basic concepts of perturbative QCD in its high-energy limit. I shall concentrate on the approach to the unitarity limit, usually referred to as saturation, as well as on the gluon-number fluctuations the importance of which has recently been discovered. I shall explain the basic framework showing the need for those phenomena, first, from a simple picture of the high-energy behaviour, then, giving a short derivation of the equation driving this evolution. In the second part, I shall exhibit an analogy with statistical physics and show how this allows to derive geometric scaling in QCD with saturation. I shall finally consider the effects of gluon-number fluctuations on this picture and draw the physical consequences, i.e. a new scaling law, arising from those results.
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