dc.description.abstract | Inclusive Υ(1S) and Υ(2S) production have been measured in Pb–Pb collisions at the centre-of-mass
energy per nucleon–nucleon pair √sNN = 5.02 TeV, using the ALICE detector at the CERN LHC. The Υ
mesons are reconstructed in the centre-of-mass rapidity interval 2.5 < y < 4 and in the transverse-
momentum range pT < 15 GeV/c, via their decays to muon pairs. In this Letter, we present results
on the inclusive Υ(1S) nuclear modification factor RAA as a function of collision centrality, transverse
momentum and rapidity. The Υ(1S) and Υ(2S) RAA, 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 RΥ(2S)/RΥ(1S) of AA AA
0.28±0.12(stat)±0.06(syst). The observed Υ(1S) suppression increases with the centrality of the collision and no significant variation is observed as a function of transverse momentum and rapidity. | en_US |