Medium dependence of multiplicity distributions in MLLA

Details Medium dependence of multiplicity distributions in MLLA Medium dependence of multiplicity distributions in MLLA

2008-09-25

arxiv.org/abs/0809.4428v1

Eur.Phys.J.C61:779-784,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 9 pages, 4 eps figures; proceedings of the 3rd International Conference on Hard and Electromagnetic Probes in High-Ener

Scientific paper

10.1140/epjc/s10052-008-0829-6

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 $=e^{\gamma y}$ and $=r^{-1}e^{\gamma y}$ 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.

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