J/psi Elliptic Flow in Pb-Pb Collisions at sqrts(s_NN)=2.76 TeV

Submission Date:
24/03/2013
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System:
Pb-Pb
Energy:
2.76 TeV
Abstract Plain Text:

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 by ALICE in Pb-Pb collisions at $\snn = 2.76$ 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  $0<\pt<10$ GeV/c.
For semi-central Pb-Pb collisions at $\snn = 2.76$ TeV, an indication of non-zero $v_2$ is observed with a maximum value of $v_2 = 0.116 \pm 0.046 {\rm (stat.)} \pm 0.029 {\rm (syst.)}$ 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/psi nuclear modification factor and favors the scenario of a significant fraction of J/psi production from charm quarks in a deconfined partonic phase.