Upsilon suppression at forward rapidity in Pb-Pb collisions at root s(NN)=5.02 TeV

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The ALICE Collaboration , Acharya , S , Brücken , E J , Chang , B , Hilden , T E , Kim , D J , Litichevskyi , V , Mieskolainen , M M , Orava , R , Parkkila , J E , Rak , J , Räsänen , S S , Saarinen , S , Slupecki , M , Snellman , T W , Trzaska , W H , Vargyas , M & Viinikainen , J 2019 , ' Upsilon suppression at forward rapidity in Pb-Pb collisions at root s(NN)=5.02 TeV ' , Physics Letters B , vol. 790 , pp. 89-101 . https://doi.org/10.1016/j.physletb.2018.11.067

Title: Upsilon suppression at forward rapidity in Pb-Pb collisions at root s(NN)=5.02 TeV
Author: The ALICE collaboration; Acharya, S.; Brücken, E. J.; Chang, B.; Hilden, T. E.; Kim, D. J.; Litichevskyi, V.; Mieskolainen, M. M.; Orava, R.; Parkkila, J. E.; Rak, J.; Räsänen, S. S.; Saarinen, S.; Slupecki, M.; Snellman, T. W.; Trzaska, W. H.; Vargyas, M.; Viinikainen, J.
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
University of Helsinki, Helsinki Institute of Physics
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
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Jyväskylä
Date: 2019-03-10
Language: eng
Number of pages: 13
Belongs to series: Physics Letters B
ISSN: 0370-2693
URI: http://hdl.handle.net/10138/300858
Abstract: Inclusive gamma(1S) and gamma(2S) production have been measured in Pb-Pb collisions at the centre-of-mass energy per nucleon-nucleon pair root s(NN) = 5.02 TeV, using the ALICE detector at the CERN LHC. The gamma mesons are reconstructed in the centre-of-mass rapidity interval 2.5 < y < 4 and in the transverse momentum range p(T) < 15 GeV/c, via their decays to muon pairs. In this Letter, we present results on the inclusive gamma(1S) nuclear modification factor R-AA as a function of collision centrality, transverse momentum and rapidity. The gamma(1S) and gamma(2S) R-AA, integrated over the centrality range 0-90%, are 0.37 +/- 0.02(stat) +/- 0.03(syst) and 0.10 +/- 0.04(stat) +/- 0.02(syst), respectively, leading to a ratio R-AA(gamma(2S))/R-AA(gamma(1S))of 0.28 +/- 0.12(stat) +/- 0.06(syst). The observed gamma(1S) suppression increases with the centrality of the collision and no significant variation is observed as a function of transverse momentum and rapidity. (C) 2018 Published by Elsevier B.V.
Subject: 114 Physical sciences
QUARK-GLUON PLASMA
TRANSVERSE-MOMENTUM DEPENDENCE
J/PSI SUPPRESSION
UPSILON PRODUCTION
PP COLLISIONS
PERSPECTIVE
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