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Article
Report number arXiv:2204.10171 ; CERN-EP-2022-066
Title Measurement of the J/ψ polarization with respect to the event plane in Pb-Pb collisions at the LHC
Author(s) ALICE Collaboration  Mostrar todos os 1031 autores
Corporate author(s) The ALICE collaboration
Publication 2023-07-25
Imprint 2022-04-21
Number of pages 13
Note 17 pages, 2 captioned figures, 1 table, authors from page 12, published version, figures at http://alice-publications.web.cern.ch/node/7845
Published in: Phys. Rev. Lett. 131 (2023) 042303
DOI 10.1103/PhysRevLett.131.042303
Subject category Nuclear Physics - Experiment ; hep-ex ; Particle Physics - Experiment ; nucl-ex
Accelerator/Facility, Experiment CERN LHC ; ALICE
Keywords QCD ; relativistic heavy ion physics ; quark gluon plasma ; quarkonium ; polarization ; experimental results
Abstract The polarization of inclusive J/ψ produced in PbPb collisions at sNN=5.02 TeV at the LHC was studied by ALICE in the dimuon channel, via the measurement of the angular distribution of its decay products. The study was performed in the rapidity region 2.5<y<4, for three transverse momentum intervals (2<pT<4, 4<pT<6, 6<pT<10 GeV/c) and as a function of the centrality of the collision for 2<pT<6 GeV/c. For the first time, the polarization was measured with respect to the event plane of the collision, by considering the angle between the positive-charge decay muon in the J/ψ rest frame and the axis perpendicular to the event-plane vector in the laboratory system. A small transverse polarization is measured, with a significance reaching 3.9σ at low pT and for intermediate centrality values. The polarization could be connected with the existence of a strong magnetic field in the early stage of quark-gluon plasma formation in PbPb collisions, as well as with its behaviour as a rotating fluid with large vorticity.
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Copyright/License Publication: © 2023-2025 CERN (License: CC-BY-4.0)
Preprint: © 2022-2025 CERN (License: CC-BY-4.0)
Submitted by javier.castillo.castellanos@cern.ch



 


 Record created 2022-03-24, last modified 2025-01-14


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