Journal article
Authors list: Abou Yassine, R.; 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.; Fabbietti, L.; Floersheimer, H.; Fonte, P.; Friese, J.; Froehlich, I; Foertsch, J.; Galatyuk, T.; Gniazdowski, T.; Greifenhagen, R.; Grunwald, M.; Gumberidze, M.; Harabasz, S.; Heinz, T.; Hoehne, C.; Hojeij, F.; Holzmann, R.; Huck, H.; Idzik, M.; Kaempfer, B.; Kampert, K-H; Kardan, B.; Kedych, V; Koenig, I; Koenig, W.; Kohls, M.; Kolas, J.; Kornakov, G.; Kotte, R.; Kres, I; Krueger, W.; Kugler, A.; Lalik, R.; Lebedev, S.; Linev, S.; Linz, F.; Lopes, L.; Lorenz, M.; Malige, A.; Markert, J.; Matulewicz, T.; Maurus, S.; Metag, V; Michel, J.; Molenda, A.; Muentz, C.; Nabroth, M.; Naumann, L.; Nowakowski, K.; Orlinski, J.; Otto, J-H; 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.; Schwab, E.; Scozzi, F.; Seck, F.; Selyuzhenkov, I; Singh, U.; Skorpil, L.; Smyrski, J.; Spies, S.; Stefaniak, M. S.; Stroebele, H.; Stroth, J.; Sumara, K.; Svoboda, O.; Szala, M.; Tlusty, P.; Traxler, M.; Wagner, V; Wasiluk, M.; Weber, A. A.; Wendisch, C.; Wirth, J.; Zbroszczyk, H. P.; Zherebtsova, E.; Zielinski, M.; Zumbruch, P.
Publication year: 2022
Journal: Physics Letters B
Volume number: 835
ISSN: 0370-2693
eISSN: 1873-2445
Open access status: Gold
DOI Link: https://doi.org/10.1016/j.physletb.2022.137506
Publisher: Elsevier
Abstract:
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 root s(NN)= 2.4GeV 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's 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 +/- 1.3 (stat.) +/- 2.1 (syst.) for Au+Au and < P-Lambda >(%) = 6.2 +/- 0.4 (stat.) +/- 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 3GeV. 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. (c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Citation Styles
Harvard Citation style: Abou Yassine, R., Adamczewski-Musch, J., Asal, C., Becker, M., Belounnas, A., Blanco, A., et al. (2022) Measurement of global polarization of Λ hyperons in few-GeV heavy-ion collisions, Physics Letters B, 835, Article 137506. https://doi.org/10.1016/j.physletb.2022.137506
APA Citation style: Abou Yassine, R., 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., Fabbietti, L., Floersheimer, H., Fonte, P., Friese, J., Froehlich, I., Foertsch, J., ...Zumbruch, P. (2022). Measurement of global polarization of Λ hyperons in few-GeV heavy-ion collisions. Physics Letters B. 835, Article 137506. https://doi.org/10.1016/j.physletb.2022.137506
Keywords
MESONS; PLUS AU COLLISIONS; SPIN
