Inclusive, prompt and non-prompt J/ ψ production at mid-rapidity in Pb-Pb collisions at √sNN = 2.76 TeV

Adam, J. and Adamova, D. and Aggarwal, M. M. and Rinella, G. A. and Agnello, M. and Barnaföldi, Gergely Gábor and Bencédi, Gyula and Berényi, Dániel and Boldizsár, László and Dénes, Ervin and Hamar, Gergő and Kiss, Gábor and Varga-Kőfaragó, Mónika and Lévai, Péter and Lowe, Andrew John and Oláh, László and Pochybova, Sona and Varga, Dezső (2015) Inclusive, prompt and non-prompt J/ ψ production at mid-rapidity in Pb-Pb collisions at √sNN = 2.76 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2015 (7). ISSN 1126-6708

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Abstract

The transverse momentum (pT) dependence of the nuclear modification factor RAA and the centrality dependence of the average transverse momentum 〈pT〉 for inclusive J/ ψ have been measured with ALICE for Pb-Pb collisions at √sNN = 2.76 TeV in the e+e− decay channel at mid-rapidity (|y| < 0.8). The 〈pT〉 is significantly smaller than the one observed for pp collisions at the same centre-of-mass energy. Consistently, an increase of RAA is observed towards low pT. These observations might be indicative of a sizable contribution of charm quark coalescence to the J/ ψ production. Additionally, the fraction of non-prompt J/ ψ from beauty hadron decays, fB, has been determined in the region 1.5 < pT < 10 GeV/c in three centrality intervals. No significant centrality dependence of fB is observed. Finally, the RAA of non-prompt J/ ψ is discussed and compared with model predictions. The nuclear modification in the region 4.5 < pT < 10 GeV/c is found to be stronger than predicted by most models.

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