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Akindinov, A; Andrei, C; Antinori, F; Anuj, C; Arcelli, S; Barth, K; Batigne, G; Becht, P; Behera, D; Belikov, I; Bellini, F; Beole, S; Berdnikov, Y; Bergmann, L; Biro, G; Bok, J; Boldizsár, L; Borel, H; Botta, E; Bysiak, S A; Caliva, A; Chandra, S; Chattopadhyay, S; Cheynis, B; Christiansen, P; Ciacco, M; Conesa Balbastre, G; Das, P; Degenhardt, H F; Dhankher, P; Dmitrieva, U; Eulisse, G; Fan, W; Ferrero, A; Filova, V; Galvan, C D; Gianotti, P; Grosso, R; Heybeck, B; Hosokawa, R; Jowett, J M; Karavichev, O; Kashyap, V; Klein-Bösing, C; Kondratyeva, N; Konig, J; Kotliarov, A; Kovalenko, O; Kučera, V; Kumar, D; Kurepin, A; Kurepin, A B; Kushpil, S; Lindenstruth, V; Lindner, A; Mager, M; Mishra, A N; Mordasini, C; Nair, R; Nikulin, V; Oleniacz, J; Peresunko, D; Pezzi, R P; Piano, S; Pinsky, L; Pisano, S; Pruneau, C A; Puccio, M; Raniwala, R; Ricci, R; Rubini, N; Rui, R; Sahoo, P; Sahu, D; Sahu, P K; Sakai, S; Sambyal, S; Schicker, R; Schmidt, M O; Schotter, R; Seo, J J; Shirinkin, S; Singh, B; Stachel, J; Storetvedt, M M; Tang, Z; Tapia Takaki, J D; Tkacik, M; Torales-Acosta, F; Tripathy, T; Trubnikov, V; Trzcinski, T P; Vértesi, R; Vilakazi, Z; Vorobyev, I; Vrláková, J; Wiechula, J; Windelband, B; Yano, S; Zhigareva, N
Physical review letters, 07/2023, Letnik: 131, Številka: 4Journal Article
We study the polarization of inclusive J/ψ produced in Pb-Pb collisions at sqrts_{NN}=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_{T}<4, 4<p_{T}<6, 6<p_{T}<10 GeV/c) and as a function of the centrality of the collision for 2<p_{T}<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 p_{T} 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.
