Centrality, rapidity and transverse momentum dependence of J/ψ suppression in Pb-Pb collisions at √sNN = 2.76TeV

Abelev, B. and Adam, J. and Adamová, D. and Aggarwal, M. M. and Aglieri, Rinella G. and Agnello, M. and Agócs, András and Agostinelli, A. and Agrawal, N. and Ahammed, Z. and Ahmad, N. and Ahmad, Masoodi A. and Ahmed, I. and Ahn, S. U. and Ahn, S. A. and Aimo, I. and Aiola, S. and Ajaz, M. and Akindinov, A. and Aleksandrov, D. and Alessandro, B. and Alexandre, D. and Alici, A. and Alkin, A. and Alme, J. and Alt, T. and Altini, V. and Altinpinar, S. and Altsybeev, I. and Alves, Garcia Prado C. and Barnaföldi, Gergely Gábor and Bencédi, Gyula and Berényi, Dániel and Boldizsár, László and Dénes, Ervin and Hamar, Gergő and Kiss, Gábor and Lévai, Péter and Molnár, Levente and Oláh, László and Pochybova, Sona (2014) Centrality, rapidity and transverse momentum dependence of J/ψ suppression in Pb-Pb collisions at √sNN = 2.76TeV. PHYSICS LETTERS B, 734. pp. 314-327. ISSN 0370-2693

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Abstract

The inclusive J/ψ nuclear modification factor (RAA) in Pb-Pb collisions at √sNN = 2.76TeV 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 µ +µ − decay channel at forwardrapidity (2.5 < y < 4). The J/ψ yields measured in Pb-Pb are suppressed compared to those in pp collisions scaled by the number of binary collisions. The RAA integrated over a centrality range corresponding to 90% of the inelastic Pb-Pb cross section is 0.72 ± 0.06(stat.) ± 0.10(syst.) at mid-rapidity and 0.58 ± 0.01(stat.) ± 0.09(syst.) at forward-rapidity. At low transverse momentum, significantly larger values of RAA are measured at forward-rapidity compared to measurements at lower energy. These features suggest that a contribution to the J/ψ yield originates from charm quark (re)combination in the deconfined partonic medium.

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