Abstract: The transverse momentum (p<inf>T</inf>) dependence of the nuclear modification factor R<inf>AA</inf> and the centrality dependence of the average transverse momentum 〈p<inf>T</inf>〉 for inclusive J/ψ have been measured with ALICE for Pb-Pb collisions at √s<inf>NN</inf> TeV in the e+e<sup>−</sup> decay channel at mid-rapidity (|y| < 0.8). The 〈p<inf>T</inf>〉 is significantly smaller than the one observed for pp collisions at the same centre-of-mass energy. Consistently, an increase of R<inf>AA</inf> is observed towards low p<inf>T</inf>. 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<inf>B</inf>, has been determined in the region 1.5 < p<inf>T</inf>< 10 GeV/c in three centrality intervals. No significant centrality dependence of f<inf>B</inf> is observed. Finally, the R<inf>AA</inf> of non-prompt J/ψ is discussed and compared with model predictions. The nuclear modification in the region 4.5 < p<inf>T</inf>< 10 GeV/c is found to be stronger than predicted by most models.

Inclusive, prompt and non-prompt J/Psi production at mid-rapidity in Pb-Pb collisions at sqrt(sNN)=2.76 TeV

DE CARO, ANNALISA;DE GRUTTOLA, DANIELE;DE PASQUALE, Salvatore;FUSCO GIRARD, Mario;MENINNO, ELISA;PAGANO, PAOLA;VIRGILI, Tiziano;CALIVA', Alberto
2015

Abstract

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 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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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/4692531
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