Charmonium production in Pb-Pb collisions with ALICE at the LHC

Abstract

We report on published charmonium measurements performed by ALICE, at the LHC, in Pb-Pb collisions at a center of mass energy per nucleon-nucleon collision $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV, at both mid ($|y|<0.8$) and forward ($2.5<y<4$) rapidities. The nuclear modification factor of inclusive $\mathrm{J}/\psi$ is presented as a function of the collision centrality and the $\mathrm{J}/\psi$ transverse momentum, $p_{\mathrm{T}}$. The variation of the $\mathrm{J}/\psi$ mean transverse momentum square as a function of the collision centrality is also discussed. These measurements are compared to state of the art models that include one or several of the following mechanisms: color screening of the charm quarks, statistical hadronization at the QGP phase boundary, balance between $\mathrm{J}/\psi$ dissociation and regeneration in the QGP, $\mathrm{J}/\psi$ interaction with a dense comoving medium. Results on the production of the heavier and less bound ${\psi }^{\prime }$ meson in Pb-Pb collisions at forward-rapidity are also presented and compared to both models and measurements performed by other experiments. At mid-rapidity we also report on ALICE unique capability to separate prompt and non-prompt $\mathrm{J}/\psi$ production down to low $p_{\mathrm{T}}$ ($\ge 1.5$ GeV/$c$) and thus disentangle between effects on prompt $\mathrm{J}/\psi$ mesons and energy loss of $b$ quarks in the QGP.

4 pages, 7 figures, Quark Matter 2015, Kobe, Japan

References in corpus (6)

• J/psi Production in sqrt (s_NN)= 200 GeV Cu+Cu Collisions
• Measurement of an excess in the yield of J/$\psi$ at very low $p_{\mathrm{T}}$ in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Differential studies of inclusive J/$\psi$ and $\psi$(2S) production at forward rapidity in Pb-Pb collisions at $\sqrt{{\text{s}}_{{}_{\mathbf{NN}}}}$ = 2.76 TeV
• Inclusive, prompt and non-prompt J/$\psi$ production at mid-rapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Measurement of prompt psi(2S) to J/psi yield ratios in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV
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Cited by in corpus (2)

• ALICE Overview
• Experimental overview on quarkonium production