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

Abstract

The production of J/$\psi$ and $\psi (2S)$ was measured with the ALICE detector in Pb-Pb collisions at the LHC. The measurement was performed at forward rapidity ($2.5<y<4$) down to zero transverse momentum ($p_{\mathrm{T}}$) in the dimuon decay channel. Inclusive J/$\psi$ yields were extracted in different centrality classes and the centrality dependence of the average $p_{\mathrm{T}}$ is presented. The J/$\psi$ suppression, quantified with the nuclear modification factor ($R_{\mathrm{AA}}$), was studied as a function of centrality, transverse momentum and rapidity. Comparisons with similar measurements at lower collision energy and theoretical models indicate that the J/$\psi$ production is the result of an interplay between color screening and recombination mechanisms in a deconfined partonic medium, or at its hadronization. Results on the $\psi (2S)$ suppression are provided via the ratio of $\psi (2S)$ over J/$\psi$ measured in pp and Pb-Pb collisions.

43 pages, 11 captioned figures, 3 tables, 12 additional tables in appendix, authors from page 38, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1686

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