Regular Article - Theoretical Physics
Medium dependence of multiplicity distributions in MLLA
Departamento de Física de Partículas and IGFAE, Universidade de Santiago de Compostela, 15706, Santiago de Compostela, Spain
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Published online: 16 December 2008
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〉=e γ y and 〈n Q〉=r −1e γ y , 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.
© Springer-Verlag , 2009