Alexey Vinogradov

QCD nuclear factor and moments of multiplicity distributions in higher orders of perturbation theory

Perturbative solutions to the gluodynamics equations withmodified integral kernel in the second and third orders of the perturbation theory (2NLO, i.e., next-to-next-to-leading order, and 3NLO, i.e., next-to-next-to-next-to-leading order approximations) were found. The effect of the nuclear factor NS on the behavior of the ratio Hq of cumulant and factorial moments of multiplicity distributions was analyzed. Theoretical conclusions were compared to the results of simulation of p-Pb and Pb-Pb collisions of nuclei with energies of 200 and 546 GeV/nucleon.