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arXiv · hep-ph/0610436

QCD at high energy: saturation and fluctuation effects

Gregory Soyez
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Abstract

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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Gregory Soyez. 2006-10-31. QCD at high energy: saturation and fluctuation effects. https://arxiv.org/abs/hep-ph/0610436

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