Energy dependence of the saturation scale and the charged multiplicity in pp and AA collisions

Details Energy dependence of the saturation scale and the charged multiplicity in pp and AA collisions Energy dependence of the saturation scale and the charged multiplicity in pp and AA collisions

2011-04-19

arxiv.org/abs/1104.3725v2

Eur.Phys.J.C71:1699,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

RevTeX, 8 pages, 4 figures. V2: modified discussion of fragmentation, published in EPJC

Scientific paper

10.1140/epjc/s10052-011-1699-x

A natural framework to understand the energy dependence of bulk observables from lower energy experiments to the LHC is provided by the Color Glass Condensate, which leads to a "geometrical scaling" in terms of an energy dependent saturation scale Q_s. The measured charged multiplicity, however, seems to grow faster (~\sqrt{s}^0.3) in nucleus-nucleus collisions than it does for protons (~\sqrt{s}^0.2), violating the expectation from geometric scaling. We argue that this difference between pp and AA collisions can be understood from the effect of DGLAP evolution on the value of the saturation scale, and is consistent with gluon saturation observations at HERA.

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