We report on the first measurement of inclusive J=c elliptic flow v2 in heavy-ion collisions at the LHC. pffiffiffiffiffiffiffiffThe measurement is performed with the ALICE detector in Pb-Pb collisions at sNN 1⁄4 2:76 TeV in the rapidity range 2:5 < y < 4:0. The dependence of the J=c v2 on the collision centrality and on the J=c transverse momentum is studied in the range 0 pT < 10 GeV=c. For semicentral Pb-Pb collisions at pffiffiffiffiffiffiffiffsNN 1⁄4 2:76 TeV, an indication of nonzero v2 is observed with a largest measured value of v2 1⁄4 0:116 ` 0:046ðstatÞ ` 0:029ðsystÞ for J=c in the transverse momentum range 2 pT < 4 GeV=c. The elliptic flow measurement complements the previously reported ALICE results on the inclusive J=c nuclear modification factor and favors the scenario of a significant fraction of J=c production from charm quarks in a deconfined partonic phase.
J/ψ Elliptic Flow in Pb-Pb Collisions at sqrt[s_{NN}]=2.76 TeV
ARNALDI, Roberta;BALA, RENU;BEOLE', Stefania;BERZANO, DARIO CARLO DOMENICO;BIANCHI, LIVIO;BOTTA, Elena;BRUNA, ELENA;BUFALINO, STEFANIA;CORRALES MORALES, YASSER;FERRETTI, Alessandro;GAGLIARDI, Martino;GALLIO, Mauro;INNOCENTI, GIAN MICHELE;LEONCINO, MARCO;MASERA, Massimo;MILANO, LEONARDO;OPPEDISANO, Chiara;RAMELLO, Luciano;RUSSO, RICCARDO;SCOMPARIN, ENRICO;SITTA, Mario;VERCELLIN, Ermanno;
2013-01-01
Abstract
We report on the first measurement of inclusive J=c elliptic flow v2 in heavy-ion collisions at the LHC. pffiffiffiffiffiffiffiffThe measurement is performed with the ALICE detector in Pb-Pb collisions at sNN 1⁄4 2:76 TeV in the rapidity range 2:5 < y < 4:0. The dependence of the J=c v2 on the collision centrality and on the J=c transverse momentum is studied in the range 0 pT < 10 GeV=c. For semicentral Pb-Pb collisions at pffiffiffiffiffiffiffiffsNN 1⁄4 2:76 TeV, an indication of nonzero v2 is observed with a largest measured value of v2 1⁄4 0:116 ` 0:046ðstatÞ ` 0:029ðsystÞ for J=c in the transverse momentum range 2 pT < 4 GeV=c. The elliptic flow measurement complements the previously reported ALICE results on the inclusive J=c nuclear modification factor and favors the scenario of a significant fraction of J=c production from charm quarks in a deconfined partonic phase.File | Dimensione | Formato | |
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