Medium dependence of multiplicity distributions in MLLA

Abstract

We study the modification of the multiplicity distributions in MLLA due to the presence of a QCD medium. The medium is introduced though a multiplicative constant ($f_{med}$) in the soft infrared parts of the kernels of QCD evolution equations. Using the asymptotic ansatz for quark and gluons mean multiplicities $<n_G>=e^{\gamma y}$ and $<n_Q>=r^{-1}{e}^{\gamma y}$ respectively, we study two cases: fixed $\gamma$ as previously considered in the literature, and fixed ${\alpha }_s$. We find opposite behaviors of the dispersion of the multiplicity distributions with increasing $f_{med}$ in both cases. For fixed $\gamma$ the dispersion decreases, while for fixed ${\alpha }_s$ it increases.

LaTeX, 9 pages, 4 eps figures; proceedings of the 3rd International Conference on Hard and Electromagnetic Probes in High-Energy Nuclear Collisions - Hard Probes 2008 (Illa de A Toxa, Spain, June 8th-14th 2008)

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Cited by in corpus (3)

• Jet quenching
• The quark-gluon medium
• Collimation of average multiplicity in QCD jets