The European Physical Journal C

, Volume 62, Issue 3, pp 541–545 | Cite as

Medium-modified average multiplicity and multiplicity fluctuations in jets

Regular Article - Theoretical Physics

Abstract

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.

PACS

12.38.-t 12.38.Bx 

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Copyright information

© Springer-Verlag / Società Italiana di Fisica 2009

Authors and Affiliations

  1. 1.Institut für Theoretische PhysikUniversität HamburgHamburgGermany

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