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Measurement of the J/ψ polarization with respect to the event plane in Pb-Pb collisions at the LHC

We study the polarization of inclusive J/ψ produced in Pb-Pb collisions at √sNN=5.02 TeV at the LHC in the dimuon channel, via the measurement of the angular distribution of its decay products. We perform the study in the rapidity region 2.5<y<4, for three transverse momentum intervals (2<p...

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Hauptverfasser: Acharya, Shreyasi (Verfasst von) , Angelov, Venelin (Verfasst von) , Berdnikova, Anastasia (Verfasst von) , Bergmann, Luisa (Verfasst von) , Danisch, Meike (Verfasst von) , Feuillard, Victor (Verfasst von) , Fokin, Ilya D. (Verfasst von) , Glässel, Peter (Verfasst von) , Kroesen, Martin (Verfasst von) , Nath, Abhishek (Verfasst von) , Pachmayer, Yvonne C. (Verfasst von) , Reygers, Klaus (Verfasst von) , Schicker, Rainer (Verfasst von) , Skorodumovs, Georgijs (Verfasst von) , Stachel, Johanna (Verfasst von) , Stiefelmaier, Stephan (Verfasst von) , Veen, Casper Arie van (Verfasst von) , Völkl, Martin (Verfasst von) , Windelband, Bernd (Verfasst von) , Yüncü, Alperen (Verfasst von) , Zanone, Federica (Verfasst von)
Körperschaft: ALICE (Verfasst von)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 25 July 2023
In: Physical review letters
Year: 2023, Jahrgang: 131, Heft: 4, Pages: 1-13
ISSN:1079-7114
DOI:10.1103/PhysRevLett.131.042303
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevLett.131.042303
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.131.042303
Volltext
Verfasserangaben:S. Acharya et al. (ALICE Collaboration)*
Beschreibung
Zusammenfassung:We study the polarization of inclusive J/ψ produced in Pb-Pb collisions at √sNN=5.02 TeV at the LHC in the dimuon channel, via the measurement of the angular distribution of its decay products. We perform the study in the rapidity region 2.5<y<4, for three transverse momentum intervals (2<pT<4, 4<pT<6, 6<pT<10 GeV/c) and as a function of the centrality of the collision for 2<pT<6 GeV/c. For the first time, the polarization is measured with respect to the event plane of the collision, by considering the angle between the positive-charge decay muon in the J/ψ rest frame and the axis perpendicular to the event-plane vector in the laboratory system. A small transverse polarization is measured, with a significance reaching 3.9σ at low pT and for intermediate centrality values. The polarization could be connected with the behavior of the quark-gluon plasma, formed in Pb-Pb collisions, as a rotating fluid with large vorticity, as well as with the existence of a strong magnetic field in the early stage of its formation.
Beschreibung:*ALICE Collaboration: S. Acharya, V. Anguelov, A. Berdnikova, L. Bergmann, M.C. Danisch, V.J.G. Feuillard, I. Fokin, P. Glässel, M. Kroesen, A. Nath, Y. Pachmayer, K. Reygers, R. Schicker, G. Skorodumovs, J. Stachel, S.F. Stiefelmaier, C.A. van Veen, M.A. Völkl, B. Windelband, A. Yuncu, F. Zanone [und 1010 weitere Personen]
Gesehen am 14.02.2024
Beschreibung:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.131.042303

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