Centrality, rapidity and transverse momentum dependence of $J/\psi$ suppression in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$=2.76 TeV

Abstract

The inclusive $J/\psi$ nuclear modification factor $R_{\mathrm{AA}}$ in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$=2.76 TeV has been measured by ALICE as a function of centrality in the e${}^{+}$e${}^{-}$ decay channel at mid-rapidity $|y|<0.8$ and as a function of centrality, transverse momentum and rapidity in the ${\mu }^{+}{\mu }^{-}$ decay channel at forward-rapidity $2.5<y<4$.The $J/\psi$ yields measured in Pb-Pb are suppressed compared to those in pp collisions scaled by the number of binary collisions. The $R_{\mathrm{AA}}$ integrated over a centrality range corresponding to 90% of the inelastic Pb-Pb cross section is $0.72\pm 0.06$ (stat.) $\pm 0.10$ (syst.) at mid-rapidity and $0.57\pm 0.01$ (stat.) $\pm 0.09$ (syst.) at forward-rapidity. At low transverse momentum, significantly larger values of $R_{\mathrm{AA}}$ are measured at forward-rapidity compared to measurements at lower energy. These features suggest that a contribution to the $J/\psi$ yield originates from charm quarks (re)combination in the deconfined partonic medium.

24 pages, 5 captioned figures, 3 tables, authors from page 19, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/409

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