Centrality dependence of ψ(2S) suppression in p-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) (2016) Centrality dependence of ψ(2S) suppression in p-Pb collisions at √sNN = 5.02 TeV. Journal of High Energy Physics, 2016 (6). Art.No.50-23. ISSN 1029-8479

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Abstract

The inclusive production of the ψ(2S) charmonium state was studied as a function of centrality in p-Pb collisions at the nucleon- nucleon center of mass energy √sNN = 5.02 TeV at the CERN LHC. The measurement was performed with the ALICE detector in the center of mass rapidity ranges −4.46< ycms< −2.96 and 2.03< ycms< 3.53, down to zero transverse momentum, by reconstructing the ψ(2S) decay to a muon pair. The ψ(2S) production cross section σψ(2S) is presented as a function of the collision centrality, which is estimated through the energy deposited in forward rapidity calorimeters. The relative strength of nuclear effects on the ψ(2S) and on the corresponding 1S charmonium state J/ψ is then studied by means of the double ratio of cross sections [σψ(2S)/σJ/ ψ]pPb/[σψ(2S)/σJ/ψ]pp between p-Pb and pp collisions, and by the values of the nuclear modification factors for the two charmonium states. The results show a large suppression of ψ(2S) production relative to the J/ψ at backward (negative) rapidity, corresponding to the flight direction of the Pb-nucleus, while at forward (positive) rapidity the suppressions of the two states are comparable. Finally, comparisons to results from lower energy experiments and to available theoretical models are presented.

Item Type: Article
Keywords: centrality dependance, proton-lead
Date: 8 June 2016
Subjects: NATURAL SCIENCES > Physics
Additional Information: Open Access, Copyright CERN, for the benefit of the ALICE Collaboration. Article funded by SCOAP3. Received: March 11, 2016. Received: March 11, 2016. Revised: May 13, 2016. Accepted: May 27, 2016. Published: June 8, 2016.
Divisions: Faculty of Science > Department of Physics
Publisher: Springer
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 28 Oct 2017 17:34
Last Modified: 01 May 2018 16:27
URI: http://digre.pmf.unizg.hr/id/eprint/5628

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