Upsilon production and nuclear modification at forward rapidity in Pb-Pb collisions at root S-NN=5.02 TeV

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http://hdl.handle.net/10138/336711

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The ALICE Collaboration , Acharya , S , Adamova , D , Kim , D J , Krizek , F , Novitzky , N , Onnerstad , B S , Parkkila , J E , Rak , J , Rytkönen , H M , Räsänen , S , Saarimäki , O A M , Slupecki , M & Trzaska , W H 2021 , ' Upsilon production and nuclear modification at forward rapidity in Pb-Pb collisions at root S-NN=5.02 TeV ' , Physics Letters B , vol. 822 , 136579 . https://doi.org/10.1016/j.physletb.2021.136579

Title: Upsilon production and nuclear modification at forward rapidity in Pb-Pb collisions at root S-NN=5.02 TeV
Author: The ALICE collaboration; Acharya, S.; Adamova, D.; Kim, D. J.; Krizek, F.; Novitzky, Norbert; Onnerstad, B.S.; Parkkila, J. E.; Rak, Jan; Rytkönen, Heidi Maria; Räsänen, Sami; Saarimäki, Oskari Antti Matti; Slupecki, M.; Trzaska, W. H.
Other contributor: University of Helsinki, University of Jyväskylä
University of Helsinki, The Czech Academy of Sciences
University of Helsinki, University of Tsukuba
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Jyväskylä
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
Date: 2021-11-10
Language: eng
Number of pages: 15
Belongs to series: Physics Letters B
ISSN: 0370-2693
DOI: https://doi.org/10.1016/j.physletb.2021.136579
URI: http://hdl.handle.net/10138/336711
Abstract: The production of Upsilon mesons in Pb-Pb collisions at a centre-of-mass energy per nucleon pair root S-NN = 5.02 TeV is measured with the muon spectrometer of the ALICE detector at the LHC. The yields as well as the nuclear modification factors are determined in the forward rapidity region 2.5 < y < 4.0, as a function of rapidity, transverse momentum and collision centrality. The results show that the production of the Upsilon(1S) meson is suppressed by a factor of about three with respect to the production in proton-proton collisions. For the first time, a significant signal for the Upsilon(2S) meson is observed at forward rapidity, indicating a suppression stronger by about a factor 2-3 with respect to the ground state. The measurements are compared with transport, hydrodynamic, comover and statistical hadronisation model calculations. (C) 2021 European Organization for Nuclear Research, ALICE. Published by Elsevier B.V.
Subject: 114 Physical sciences
SIDE ANGULAR-CORRELATIONS
PP COLLISIONS
QUARKONIUM PRODUCTION
CHARMONIUM PRODUCTION
TRANSVERSE-MOMENTUM
PROTON-LEAD
LONG-RANGE
SUPPRESSION
DECAY
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