J/Psi Elliptic Flow in Pb-Pb Collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV

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 $\sqrt{s_{\mathrm{NN}}}=2.76$ 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 $0<p_{\mathrm{T}}<10$ GeV/$c$. For semi-central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV, an indication of non-zero $v_2$ is observed with a maximum value of $v_2=0.116\pm 0.046(stat.)\pm 0.029(syst.)$ for J/$\psi$ in the transverse momentum range $2<p_{\mathrm{T}}<4$ 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.

16 pages, 4 captioned figures, 1 Table, authors from page 11, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/591

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