Medium dependence of multiplicity distributions in MLLA - High Energy Physics - Phenomenology

Abstract: We study the modification of the multiplicity distributions in MLLA due tothe presence of a QCD medium. The medium is introduced though a multiplicativeconstant $f {med}$ in the soft infrared parts of the kernels of QCD evolutionequations. Using the asymptotic ansatz for quark and gluons mean multiplicities$=e^{\gamma y}$ and $=r^{-1}e^{\gamma y}$ respectively, we study twocases: fixed $\gamma$ as previously considered in the literature, and fixed$\alpha s$. We find opposite behaviors of the dispersion of the multiplicitydistributions with increasing $f {med}$ in both cases. For fixed $\gamma$ thedispersion decreases, while for fixed $\alpha s$ it increases.

Author: N. Armesto, C. Pajares, P. Quiroga-Arias

Source: https://arxiv.org/