23 de agosto de 2018 | Altas Energias, Publicações
Dumitru, Adrian, Giannini, Andre V., Luzum, Matthew, Nara, Yasushi
Physics Letters B, Volume 784, p. 417-422
23/08/2018
Abstract
Horowitz and Kovchegov have derived a kT-factorization formula for particle production at small x which includes running coupling corrections. We perform a first numerical analysis to confront the theory with data on the energy and centrality dependence of particle multiplicities at midrapidity in high-energy p+A (and A+A) collisions. Moreover, we point out a strikingly different dependence of the multiplicity per participant on Npart in p+Pb vs. Pb+Pb collisions at LHC energies, and argue that the observed behavior follows rather naturally from the convolution of the gluon distributions of an asymmetric vs. symmetric projectile and target.