Gluon saturation and energy dependence of hadron multiplicity in pp and AA collisions at the LHC

Details Gluon saturation and energy dependence of hadron multiplicity in pp and AA collisions at the LHC Gluon saturation and energy dependence of hadron multiplicity in pp and AA collisions at the LHC

2011-02-11

arxiv.org/abs/1102.2385v2

Phys.Rev.D83:114001,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 8 figures; v2: references added, results unchanged, discussion added about the centrality dependence of average tran

Scientific paper

10.1103/PhysRevD.83.114001

The recent results in \sqrt{s}=2.76 TeV Pb+Pb collisions at the Large Hadron Collider (LHC) reported by the ALICE collaboration shows that the power-law energy-dependence of charged hadron multiplicity in Pb+Pb collisions is significantly different from p+p collisions. We show that this different energy-dependence can be explained by inclusion of a strong angular-ordering in the gluon-decay cascade within the Color-Glass-Condensate (or gluon saturation) approach. This effect is more important in nucleus-nucleus collisions where the saturation scale is larger than 1 GeV. Our prescription gives a good description of the LHC data both in p+p and Pb+Pb collisions.

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