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First measurement of quarkonium polarization in nuclear collisions at the LHC

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 azimutha...

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Hauptverfasser: Acharya, Shreyasi (VerfasserIn) , Leardini, Lucia (VerfasserIn) , López, Jorge (VerfasserIn) , Martin, Nicole Alice (VerfasserIn) , Ohlson, Alice (VerfasserIn) , Pachmayer, Yvonne C. (VerfasserIn) , Reygers, Klaus (VerfasserIn) , Schicker, Rainer (VerfasserIn) , Schmah, Alexander (VerfasserIn) , Schmidt, Marten Ole (VerfasserIn) , Stachel, Johanna (VerfasserIn) , Stiefelmaier, Stephan (VerfasserIn) , Windelband, Bernd (VerfasserIn) , Yüncü, Alperen (VerfasserIn)
Körperschaft: ALICE (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 22 February 2021
In: Physics letters
Year: 2021, Jahrgang: 815, Pages: 1-13
ISSN:1873-2445
DOI:10.1016/j.physletb.2021.136146
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.physletb.2021.136146
Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0370269321000861
Volltext
Verfasserangaben:ALICE collaboration: S. Acharya, L. Leardini, J.A. Lopez, N.A. Martin, A. Ohlson, Y. Pachmayer, K. Reygers, R. Schicker, A. Schmah, M.O. Schmidt, J. Stachel, S.F. Stiefelmaier, B. Windelband, A. Yuncu [und viele weitere]
Beschreibung
Zusammenfassung: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 for pp collisions at 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.
Beschreibung:Gesehen am 18.06.2021
Beschreibung:Online Resource
ISSN:1873-2445
DOI:10.1016/j.physletb.2021.136146

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