dc.description.abstract | The polarization of inclusive J/ψ and Υ(1S) produced in Pb–Pb collisions at √sNN = 5.02 TeV at the LHC
is measured with the ALICE detector. The study is carried out by reconstructing the quarkonium through
its decay to muon pairs in the rapidity region 2.5 < y < 4 and measuring the polar and azimuthal angular
distributions of the muons. The polarization parameters λθ, λφ and λθφ are measured in the helicity
and Collins-Soper reference frames, in the transverse momentum interval 2 < pT < 10 GeV/c and pT <
15 GeV/c for the J/ψ and Υ(1S), respectively. The polarization parameters for the J/ψ are found to be
compatible with zero, within a maximum of about two standard deviations at low pT, for both reference
frames and over the whole pT range. The values are compared with the corresponding results obtained
√s = 7 and 8 TeV in a similar kinematic region by the ALICE and LHCb experiments. | en_US |