Centrality and transverse momentum dependence of inclusive J/$\psi$ production at midrapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

Abstract

The inclusive J/$\psi$ meson production in Pb-Pb collisions at a center-of-mass energy per nucleon-nucleon collision of $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV at midrapidity ($|y|$ < 0.9) is reported by the ALICE Collaboration. The measurements are performed in the dielectron decay channel, as a function of event centrality and J/$\psi$ transverse momentum $p_{\mathrm{T}}$, down to $p_{\mathrm{T}}$ = 0 GeV/$c$. The J/$\psi$ mean transverse momentum $⟨p_{\mathrm{T}}⟩$ and $r_{\mathrm{AA}}$ ratio, defined as $⟨p_{\mathrm{T}}^2{⟩}_{\mathrm{PbPb}}/⟨p_{\mathrm{T}}^2{⟩}_{\mathrm{pp}}$, are evaluated. Both observables show a centrality dependence decreasing towards central (head-on) collisions. The J/$\psi$ nuclear modification factor $R_{\mathrm{AA}}$ exhibits a strong $p_{\mathrm{T}}$ dependence with a large suppression at high $p_{\mathrm{T}}$ and an increase to unity for decreasing $p_{\mathrm{T}}$. When integrating over the measured momentum range $p_{\mathrm{T}}$ < 10 GeV/$c$, the J/$\psi$ $R_{\mathrm{AA}}$ shows a weak centrality dependence. Each measurement is compared with results at lower center-of-mass energies and with ALICE measurements at forward rapidity, as well as to theory calculations. All reported features of the J/$\psi$ production at low $p_{\mathrm{T}}$ are consistent with a dominant contribution to the J/$\psi$ yield originating from charm quark (re)combination.

24 pages, 8 captioned figures, 2 tables, authors from page 19, published version, figures at http://alice-publications.web.cern.ch/node/5653

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