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Article
Report number arXiv:1603.02816 ; CERN-EP-2016-046 ; CERN-EP-2016-046
Title Centrality dependence of ψ(2S) suppression in p-Pb collisions at sNN = 5.02 TeV
Author(s) ALICE Collaboration  Εμφάνιση και των 994 συγγραφέων
Publication 2016-06-08
Imprint 9 Mar 2016
Number of pages 20
Note Comments: 20 pages, 5 captioned figures, 2 tables, authors from page 14, submitted to JHEP, figures at http://aliceinfo.cern.ch/ArtSubmission/node/2371
20 pages, 5 captioned figures, 2 tables, authors from page 14, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/2371
In: JHEP 06 (2016) 50
DOI 10.1007/JHEP06(2016)050
Subject category Nuclear Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ALICE
Free keywords relativistic heavy ion physics ; quarkonium ; experimental results
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 rapidity, corresponding to the flight direction of the Pb-nucleus, while at forward rapidity the suppressions of the two states are comparable. Finally, comparisons to results from lower energy experiments and to available theoretical models are presented.
Copyright/License preprint: © 2016-2024 CERN (License: CC-BY-4.0)
publication: © 2016-2024 CERN (License: CC-BY-4.0)
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 Δημιουργία εγγραφής 2016-03-10, τελευταία τροποποίηση 2024-11-27


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