We report on the first measurement of inclusive J/Psi elliptic flow v2 in heavy-ion collisions at the LHC. The measurement is performed with the ALICE detector in Pb-Pb collisions at √sNN=2.76 TeV in the rapidity range 2.5 < y < 4.0. The dependence of the J/Psi v2 on the collision centrality and on the J/Psi transverse momentum is studied in the range 0 <= pT < 10 GeV/c. For semicentral Pb-Pb collisions at √sNN=2.76 TeV, an indication of nonzero v2 is observed with a largest measured value of v2=0.116+- 0.046(stat)+-0.029(syst) for J/Psi in the transverse momentum range 2 <= pT < 4 GeV/c. The elliptic flow measurement complements the previously reported ALICE results on the inclusive J/Ps inuclear modification factor and favors the scenario of a significant fraction of J/Psi production from charm quarks in a deconfined partonic phase.

J/Psi Elliptic Flow in Pb-Pb Collisions at √sNN=2.76 TeV

DE CARO, ANNALISA;DE GRUTTOLA, DANIELE;DE PASQUALE, Salvatore;FUSCO GIRARD, Mario;PAGANO, PAOLA;VIRGILI, Tiziano;
2013

Abstract

We report on the first measurement of inclusive J/Psi elliptic flow v2 in heavy-ion collisions at the LHC. The measurement is performed with the ALICE detector in Pb-Pb collisions at √sNN=2.76 TeV in the rapidity range 2.5 < y < 4.0. The dependence of the J/Psi v2 on the collision centrality and on the J/Psi transverse momentum is studied in the range 0 <= pT < 10 GeV/c. For semicentral Pb-Pb collisions at √sNN=2.76 TeV, an indication of nonzero v2 is observed with a largest measured value of v2=0.116+- 0.046(stat)+-0.029(syst) for J/Psi in the transverse momentum range 2 <= pT < 4 GeV/c. The elliptic flow measurement complements the previously reported ALICE results on the inclusive J/Ps inuclear modification factor and favors the scenario of a significant fraction of J/Psi production from charm quarks in a deconfined partonic phase.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/4255477
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