J/ψ suppression at forward rapidity in Pb–Pb collisions at √sNN = 5.02 TeV

Adam, J. and Antičić, Tome and Erhardt, Filip and Gotovac, Sven and Mudnić, Eugen and Planinić, Mirko and Poljak, Nikola and Simatović, Goran and Utrobičić, Antonija and Vicković, Linda and Zyzak, M. (ALICE Collaboration) (2017) J/ψ suppression at forward rapidity in Pb–Pb collisions at √sNN = 5.02 TeV. Physics Letters B, 766. pp. 212-224. ISSN 0370-2693

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Abstract

The inclusive J/ψ production has been studied in Pb–Pb and pp collisions at the centre-of-mass energy per nucleon pair √sNN = 5.02 TeV, using the ALICE detector at the CERN LHC. The J/ψ meson is reconstructed, in the centre-of-mass rapidity interval 2.5 < y < 4 and in the transverse-momentum range pT < 12 GeV/c, via its decay to a muon pair. In this Letter, we present results on the inclusive J/ψ cross section in pp collisions at √s = 5.02 TeV and on the nuclear modification factor RAA. The latter is presented as a function of the centrality of the collision and, for central collisions, as a function of the transverse momentum pT of the J/ψ. The measured RAA values indicate a suppression of the J/ψ in nuclear collisions and are then compared to our previous results obtained in Pb–Pb collisions at √sNN = 2.76 TeV. The ratio of the RAA values at the two energies is also computed and compared to calculations of statistical and dynamical models. The numerical value of the ratio for central events (0–10% centrality) is 1.17 ± 0.04(stat) ± 0.20(syst). In central events, as a function of pT, a slight increase of RAA with collision energy is visible in the region 2 < pT < 6 GeV/c. Theoretical calculations qualitatively describe the measurements, within uncertainties

Item Type: Article
Date: 2017
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2017 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3. Received 29 July 2016. Received in revised form 5 December 2016. Accepted 26 December 2016. Available online 10 January 2017.
Divisions: Faculty of Science > Department of Physics
Publisher: Elsevier
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 13 Nov 2017 19:41
Last Modified: 13 Nov 2017 19:42
URI: http://digre.pmf.unizg.hr/id/eprint/5688

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