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R Abou Yassine; Adamczewski-Musch, J; Asal, C; Becker, M; Belounnas, A; Blanco, A; Blume, C; Chlad, L; Chudoba, P; Ciepal, I; Cordts, M; Dreyer, J; Esmail, W A; Floersheimer, H; Fonte, P; Friese, J; tsch, J; Galatyuk, T; Gniazdowski, T; Greifenhagen, R; Grunwald, M; Gumberidze, M; Harabasz, S; Heinz, T; Höhne, C; Hojeij, F; Holzmann, R; Huck, H; Idzik, M; Kämpfer, B; K-H Kampert; Kardan, B; Koenig, I; Koenig, W; Kohls, M; J Kolas; Kornakov, G; Kotte, R; Kres, I; Krueger, W; Kugler, A; Lalik, R; Linev, S; Linz, F; Lopes, L; Lorenz, M; Malige, A; Markert, J; Matulewicz, T; Maurus, S; Metag, V; Michel, J; Molenda, A; Müntz, C; Nabroth, M; Naumann, L; Nowakowski, K; Orliński, J; J -H Otto; Parschau, M; Pauly, C; Pechenov, V; Pechenova, O; Pfeifer, D; Piasecki, K; Pietraszko, J; Povar, T; Prozorov, A; Przygoda, W; Pysz, K; Ramstein, B; Rathod, N; Ritman, J; Rodriguez-Ramos, P; Rost, A; Rustamov, A; Salabura, P; Saraiva, J; Schild, N; Scozzi, F; Seck, F; Selyuzhenkov, I; Singh, U; Skorpil, L; Smyrski, J; Stefaniak, M S; Ströbele, H; Stroth, J; Sumara, K; Svoboda, O; M Szala; Tlusty, P; Traxler, M; Wagner, V; Wasiluk, M; Weber, A A; Wendisch, C; Wirth, J; Zbroszczyk, H P; Zherebtsova, E
arXiv.org, 10/2022Paper, Journal Article
The global polarization of {\Lambda} hyperons along the total orbital angular momentum of a relativistic heavy-ion collision is presented based on the high statistics data samples collected in Au+Au collisions at \sqrt{s_{NN}} = 2.4 GeV and Ag+Ag at 2.55 GeV with the High-Acceptance Di-Electron Spectrometer (HADES) at GSI, Darmstadt. This is the first measurement below the strangeness production threshold in nucleon-nucleon collisions. Results are reported as a function of the collision centrality as well as a function of the hyperon transverse momentum (p_T) and rapidity (y_{CM}) for the range of centrality 0--40%. We observe a strong centrality dependence of the polarization with an increasing signal towards peripheral collisions. For mid-central (20--40%) collisions the polarization magnitudes are <P_{\Lambda}>(%) = 6.8 \pm 1.3 (stat.) \pm 2.1 (syst.) for Au+Au and <P_{\Lambda}>(%) = 6.2 \pm 0.4 (stat.) \pm 0.6 (syst.) for Ag+Ag, which are the largest values observed so far. This observation thus provides a continuation of the increasing trend previously observed by STAR and contrasts expectations from recent theoretical calculations predicting a maximum in the region of collision energies about 3 GeV. The observed polarization is of a similar magnitude as predicted by 3D fluid dynamics and the UrQMD plus thermal vorticity model and significantly above results from the AMPT model.
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