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Inclusive, prompt and non-prompt J/ψ production at mid-rapidity in Pb-Pb collisions at √s<inf>NN</inf> TeV
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Inclusive, prompt and non-prompt J/ψ production at mid-rapidity in Pb-Pb collisions at √sNN TeV

The ALICE collaboration,, J. Adam, D. Adamová, M.M. Aggarwal, G. Aglieri Rinella, M. Agnello, N. Agrawal, Z. Ahammed, S.U. Ahn, I. Aimo, …
Journal of High Energy Physics, 卷.2015(7), 51
07/2015

摘要

Hadron-Hadron Scattering Nuclear and High Energy Physics
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.

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https://doi.org/10.1007/JHEP07(2015)051檢視
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