Naslov
Inclusive, prompt and non-prompt J/psi production at mid-rapidity in Pb-Pb collisions at root S-NN=2.76 TeV

Autori
Adam, J. ; Antičić, Tome ; Erhardt, Filip ; Mudnić, Eugen ; Vicković, Linda ; Planinić, Mirko ; Poljak, Nikola ; Simatović, Goran ; Utrobičić, Antonija ; Zyzak, M.

Kolaboracija
ALICE Collaboration

Izvornik
The Journal of high energy physics (1126-6708) 2015 (2015), 7; 51, 33

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
prompt ; non-prompt ; J/Ψ ; production ; mid-rapidity ; Pb–Pb ; 2.76 TeV

Sažetak
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 sNN−−−√=2.76 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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