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

The transverse momentum ( p _T) dependence of the nuclear modification factor R _AA and the centrality dependence of the average transverse momentum < p _T> for inclusive J /ψ have been measured with ALICE for Pb-Pb collisions at TeV in the e+e^- decay channel at mid-rapidity (| y| < 0 .8). The < p _T> is significantly smaller than the one observed for pp collisions at the same centre-of-mass energy. Consistently, an increase of R _AA is observed towards low p _T. 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, f _B, has been determined in the region 1 .5 < p _T < 10 GeV /c in three centrality intervals. No significant centrality dependence of f _B is observed. Finally, the R _AA of non-prompt J /ψ is discussed and compared with model predictions. The nuclear modification in the region 4 .5 < p _T < 10 GeV /c is found to be stronger than predicted by most models. [Figure not available: see fulltext.]