J/ψ Elliptic Flow in Pb-Pb Collisions at √sNN=5.02 TeV

Acharya, S. and Antičić, Tome and Erhardt, Filip and Gotovac, Sven and Jerčić, Marko and Lončar, P. and Mudnić, Eugen and Planinić, Mirko and Poljak, Nikola and Simatović, Goran and Utrobičić, Antonija and Vicković, Linda and Zou, S. (ALICE Collaboration) (2017) J/ψ Elliptic Flow in Pb-Pb Collisions at √sNN=5.02 TeV. Physical Review Letters, 119 (24). pp. 242301-13. ISSN 0031-9007

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Abstract

We report a precise measurement of the J/ψ elliptic flow in Pb-Pb collisions at √sNN=5.02  TeV with the ALICE detector at the LHC. The J/ψ mesons are reconstructed at midrapidity (|y|<0.9) in the dielectron decay channel and at forward rapidity (2.5<y<4.0) in the dimuon channel, both down to zero transverse momentum. At forward rapidity, the elliptic flow v2 of the J/ψ is studied as a function of the transverse momentum and centrality. A positive v2is observed in the transverse momentum range 2<pT<8 GeV/c in the three centrality classes studied and confirms with higher statistics our earlier results at √sNN=2.76  TeV in semicentral collisions. At midrapidity, the J/ψ v2 is investigated as a function of the transverse momentum in semicentral collisions and found to be in agreement with the measurements at forward rapidity. These results are compared to transport model calculations. The comparison supports the idea that at low pT the elliptic flow of the J/ψ originates from the thermalization of charm quarks in the deconfined medium but suggests that additional mechanisms might be missing in the models.

Item Type: Article
Date: 2017
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2017 CERN, for the ALICE Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.Received 27 September 2017; revised manuscript received 7 November 2017; published 15 December 2017.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 10 Mar 2018 12:11
Last Modified: 10 Mar 2018 12:11
URI: http://digre.pmf.unizg.hr/id/eprint/5774

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