We report on the first measurement of inclusive J/psi elliptic flow v(2) in heavy-ion collisions at the LHC. The measurement is performed with the ALICE detector in Pb-Pb collisions at root s(NN) = 2.76 TeV in the rapidity range 2.5 < y < 4.0. The dependence of the J/psi v(2) on the collision centrality and on the J/psi transverse momentum is studied in the range 0 <= p(T) < 10 GeV/c. For semicentral Pb-Pb collisions at root s(NN) = 2.76 TeV, an indication of nonzero v(2) is observed with a largest measured value of v(2) = 0.116 +/-0.046(stat) +/- 0.029(syst) for J/psi in the transverse momentum range 2 <= p(T) < 4 GeV/c. The elliptic flow measurement complements the previously reported ALICE results on the inclusive J/psi nuclear 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 root s(NN)=2.76 TeV / E., A., B., A., J., A., D., A., A. M., A., M. M., A., G. A., R., M., A., A. G., A., A., A., Z., A., N., A., A. A., M., S. A., A., S. U., A., I., A., M., A., A., A., D., A., B., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 111:(2013), p. 162301. [10.1103/PhysRevLett.111.162301]

J/psi Elliptic Flow in Pb-Pb Collisions at root s(NN)=2.76 TeV

L. Cunqueiro;MEDDI, Franco;
2013

Abstract

We report on the first measurement of inclusive J/psi elliptic flow v(2) in heavy-ion collisions at the LHC. The measurement is performed with the ALICE detector in Pb-Pb collisions at root s(NN) = 2.76 TeV in the rapidity range 2.5 < y < 4.0. The dependence of the J/psi v(2) on the collision centrality and on the J/psi transverse momentum is studied in the range 0 <= p(T) < 10 GeV/c. For semicentral Pb-Pb collisions at root s(NN) = 2.76 TeV, an indication of nonzero v(2) is observed with a largest measured value of v(2) = 0.116 +/-0.046(stat) +/- 0.029(syst) for J/psi in the transverse momentum range 2 <= p(T) < 4 GeV/c. The elliptic flow measurement complements the previously reported ALICE results on the inclusive J/psi nuclear modification factor and favors the scenario of a significant fraction of J/psi production from charm quarks in a deconfined partonic phase.
2013
Photon, lepton, and heavy quark production in relativistic heavy ion collisions,Collective flow, Quark deconfinement, quark-gluon plasma production, and phase transitions
01 Pubblicazione su rivista::01a Articolo in rivista
J/psi Elliptic Flow in Pb-Pb Collisions at root s(NN)=2.76 TeV / E., A., B., A., J., A., D., A., A. M., A., M. M., A., G. A., R., M., A., A. G., A., A., A., Z., A., N., A., A. A., M., S. A., A., S. U., A., I., A., M., A., A., A., D., A., B., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 111:(2013), p. 162301. [10.1103/PhysRevLett.111.162301]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/552534
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