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

Pereira Da, Costa H. and Adam, J. and Adamová, D. and Aggarwal, M. M. and Aglieri, Rinella G. and Barnaföldi, Gergely Gábor and Bencédi, Gyula and Berényi, Dániel and Bíró, Gábor and Boldizsár, László and Dénes, Ervin and Hamar, Gergő and Kiss, Gábor and Varga-Kőfaragó, Mónika and Lévai, Péter and Oláh, László and Pochybova, Sona (2016) Charmonium production in Pb–Pb collisions with ALICE at the LHC. NUCLEAR PHYSICS A, 956. pp. 705-708. ISSN 0375-9474

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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 √sNN = 2.76 TeV, at both mid (|y| < 0.8) and forward (2.5 < y < 4) rapidities. The nuclear modification factor of inclusive J/ψ is presented as a function of the collision centrality and the J/ψ transverse momentum, pT. The variation of the J/ψ 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 J/ψ dissociation and regeneration in the QGP, J/ψ interaction with a dense comoving medium. Results on the production of the heavier and less bound ψ(2S) 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 J/ψ production down to low pT (≥ 1.5 GeV/c) and thus disentangle between effects on prompt J/ψ mesons and energy loss of b quarks in the QGP.

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