Abstract
We study the modification of the multiplicity distributions in MLLA due to the presence of a QCD medium. The medium is introduced through a multiplicative constant (f med) in the soft infrared parts of the kernels of the QCD evolution equations. Using the asymptotic ansatz for mean multiplicities of the quark and gluons, 〈n G〉=eγy and 〈n Q〉=r −1eγy, respectively, we study two cases: fixed γ as previously considered in the literature, and fixed α s . We find opposite behaviors of the dispersion of the multiplicity distributions with increasing f med in both cases. For fixed γ the dispersion decreases, while for fixed α s it increases.
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Armesto, N., Pajares, C. & Quiroga-Arias, P. Medium dependence of multiplicity distributions in MLLA. Eur. Phys. J. C 61, 779–784 (2009). https://doi.org/10.1140/epjc/s10052-008-0829-6
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DOI: https://doi.org/10.1140/epjc/s10052-008-0829-6