Medium-modified average multiplicity and multiplicity fluctuations in jets

Details Medium-modified average multiplicity and multiplicity fluctuations in jets Medium-modified average multiplicity and multiplicity fluctuations in jets

2008-11-14

arxiv.org/abs/0811.2418v2

Eur.Phys.J.C62:541-545,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages and 4 figures. Version to be published in EPJC

Scientific paper

10.1140/epjc/s10052-009-1075-2

The energy evolution of average multiplicities and multiplicity fluctuations in jets produced in heavy-ion collisions is investigated from a toy QCD-inspired model. In this model, we use modified splitting functions accounting for medium-enhanced radiation of gluons by a fast parton which propagates through the quark gluon plasma. The leading contribution of the standard production of soft hadrons is enhanced by a factor $\sqrt{N_s}$ while next-to-leading order (NLO) corrections are suppressed by $1/\sqrt{N_s}$, where the parameter $N_s>1$ accounts for the induced-soft gluons in the medium. Our results for such global observables are cross-checked and compared with their limits in the vacuum.

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