The production of J/Ï and Ï(2S) was studied with the ALICE detector in Pb-Pb collisions at the LHC. The measurement was performed at forward rapidity (2.5 < y < 4) down to zero transverse momentum (pt) in the dimuon decay channel. Inclusive J/Ï yields were extracted in different centrality classes and the centrality dependence of the average pt is presented. The J/Ï suppression, quantified with the nuclear modification factor (RAA), was measured as a function of centrality, transverse momentum and rapidity. Comparisons with similar measurements at lower collision energy and theoretical models indicate that the J/Ï production is the result of an interplay between color screening and recombination mechanisms in a deconfined partonic medium, or at its hadronization. Results on the Ï(2S) suppression are provided via the ratio of Ï(2S) over J/Ï measured in pp and Pb-Pb collisions.
Differential studies of inclusive J/Psi and Psi(2S) production at forward rapidity in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV
DE CARO, ANNALISA;DE GRUTTOLA, DANIELE;DE PASQUALE, Salvatore;FUSCO GIRARD, Mario;MENINNO, ELISA;PAGANO, PAOLA;VIRGILI, Tiziano;CALIVA', Alberto
2016
Abstract
The production of J/Ï and Ï(2S) was studied with the ALICE detector in Pb-Pb collisions at the LHC. The measurement was performed at forward rapidity (2.5 < y < 4) down to zero transverse momentum (pt) in the dimuon decay channel. Inclusive J/Ï yields were extracted in different centrality classes and the centrality dependence of the average pt is presented. The J/Ï suppression, quantified with the nuclear modification factor (RAA), was measured as a function of centrality, transverse momentum and rapidity. Comparisons with similar measurements at lower collision energy and theoretical models indicate that the J/Ï production is the result of an interplay between color screening and recombination mechanisms in a deconfined partonic medium, or at its hadronization. Results on the Ï(2S) suppression are provided via the ratio of Ï(2S) over J/Ï measured in pp and Pb-Pb collisions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.