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

We report on the first measurement of inclusive J/ψ 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/ψ v2 on the collision centrality and on the J/ψ 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/ψ in the transverse momentum range 2≤pT<4  GeV/c. The elliptic flow measurement complements the previously reported ALICE results on the inclusive J/ψ nuclear modification factor and favors the scenario of a significant fraction of J/ψ production from charm quarks in a deconfined partonic phase.

elliptic flow; Pb-Pb; heavy ion; ALICE; J/ψ; J/Psi

The ALICE Collaboration.