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


Acharya S., Acosta F. T., Adamova D., Adolfsson J., Aggarwal M. M., Rinella G. A., ...More

PHYSICS LETTERS B, vol.790, pp.89-101, 2019 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 790
  • Publication Date: 2019
  • Doi Number: 10.1016/j.physletb.2018.11.067
  • Journal Name: PHYSICS LETTERS B
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.89-101
  • Bursa Uludag University Affiliated: No

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.