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@ARTICLE{Acharya:245733,
      author       = {Acharya, Shreyasi and others},
      title        = {{F}irst measurement of quarkonium polarization in nuclear
                      collisions at the {LHC}},
      journal      = {Physics letters / B},
      volume       = {815},
      issn         = {0370-2693},
      address      = {Amsterdam},
      publisher    = {North-Holland Publ.},
      reportid     = {GSI-2022-00069, arXiv:2005.11128. CERN-EP-2020-092},
      pages        = {136146},
      year         = {2021},
      note         = {Phys. Lett. B 815 (2021) 136146. 21 pages, 3 captioned
                      figures, 3 tables, authors from page 16, published version,
                      figures at http://alice-publications.web.cern.ch/node/6223.
                      This is an open access article under the CC BY
                      license(http://creativecommons.org/licenses/by/4.0/). Funded
                      by SCOAP3.},
      abstract     = {The polarization of inclusive J/ψ and ϒ(1S) produced in
                      Pb–Pb collisions at $\sqrt{s_{\rm NN}}$ = 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 <
                      $p_T$ < 10 GeV/ c and $p_T$ < 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 $p_T$ , for both
                      reference frames and over the whole $p_T$ range. The values
                      are compared with the corresponding results obtained for pp
                      collisions at $\sqrt{s}$ = 7 and 8 TeV in a similar
                      kinematic region by the ALICE and LHCb experiments. Although
                      with much larger uncertainties, the polarization parameters
                      for ϒ(1S) production in Pb–Pb collisions are also
                      consistent with zero.},
      keywords     = {quarkonium: polarization (INSPIRE) / J/psi(3100):
                      polarization (INSPIRE) / Upsilon(9460): polarization
                      (INSPIRE) / muon: angular distribution (INSPIRE) / muon:
                      pair (INSPIRE) / heavy ion: scattering (INSPIRE) /
                      transverse momentum (INSPIRE) / CERN LHC Coll (INSPIRE) /
                      ALICE (INSPIRE) / rapidity (INSPIRE) / LHC-B (INSPIRE) /
                      experimental results (INSPIRE) / 5020 GeV-cms/nucleon
                      (INSPIRE)},
      cin          = {ALI / DTL / CIT / EXM / ALICE@CERN},
      ddc          = {530},
      cid          = {I:(DE-Ds200)ALI-20080822OR105 /
                      I:(DE-Ds200)DTL-20051214OR031 /
                      I:(DE-Ds200)CIT-20110310OR121 /
                      I:(DE-Ds200)EXM-20080818OR100 / I:(DE-Ds200)Coll-CERN-ALICE},
      pnm          = {612 - Cosmic Matter in the Laboratory (POF4-612) / HGS-HIRe
                      - HGS-HIRe for FAIR (HGS-HIRe) / SUC-GSI-Heidelberg -
                      Strategic university cooperation GSI-U Heidelberg
                      (SUC-GSI-HE) / SUC-GSI-Frankfurt - Strategic university
                      cooperation GSI-U Frankfurt/M (SUC-GSI-FR) /
                      SUC-GSI-Darmstadt - Strategic university cooperation GSI-TU
                      Darmstadt (SUC-GSI-DA)},
      pid          = {G:(DE-HGF)POF4-612 / G:(DE-Ds200)HGS-HIRe /
                      G:(DE-Ds200)SUC-GSI-HE / G:(DE-Ds200)SUC-GSI-FR /
                      G:(DE-Ds200)SUC-GSI-DA},
      experiment   = {EXP:(DE-H253)LHC-Exp-ALICE-20150101},
      typ          = {PUB:(DE-HGF)16},
      eprint       = {2005.11128},
      howpublished = {arXiv:2005.11128},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2005.11128;\%\%$},
      UT           = {WOS:000632729200048},
      doi          = {10.1016/j.physletb.2021.136146},
      url          = {https://repository.gsi.de/record/245733},
}