دورية أكاديمية
Measurement of global polarization of $\Lambda$ hyperons in few-GeV heavy-ion collisions
| العنوان: | Measurement of global polarization of $\Lambda$ hyperons in few-GeV heavy-ion collisions |
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| المؤلفون: | Abou Yassine, R., Adamczewski-Musch, J., Asal, C., Becker, M., Belounnas, A., Blanco, A., Blume, C., Chlad, L., Chudoba, P., Ciepał, Izabela, Cordts, M., Dreyer, J., Esmail, W.A., Fabbietti, L., Floersheimer, H., Fonte, P., Friese, J., Fröhlich, I., Förtsch, 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., 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, Rafał, Lebedev, S., Linev, S., Linz, F., Lopes, L., Lorenz, M., Malige, Akshay, Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Molenda, A., Müntz, C., Nabroth, M., Naumann, L., Nowakowski, Krzysztof, Orliński, J., Otto, J.-H., Parschau, M., Pauly, C., Pechenov, V., Pechenova, O., Pfeifer, D., Piasecki, K., Pietraszko, J., Povar, T., Prozorov, A., Przygoda, Witold, Pysz, K., Ramstein, B., Rathod, Narendra, Ritman, J., Rodriguez-Ramos, P., Rost, A., Rustamov, A., Salabura, Piotr, Saraiva, J., Schild, N., Schwab, E., Scozzi, F., Seck, F., Selyuzhenkov, I., Singh, Udai, Skorpil, L., Smyrski, Jerzy, Spies, S., Stefaniak, M.S., Ströbele, H., Stroth, J., Sumara, Konrad, Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Wagner, V., Wasiluk, M., Weber, A.A., Wendisch, C., Wirth, J., Zbroszczyk, H.P., Zherebtsova, E., Zieliński, Marcin, Zumbruch, P. |
| سنة النشر: | 2022 |
| المجموعة: | Jagiellonian University Repository |
| الوصف: | The global polarization of Λ 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'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 $\left< P_{\Lambda}\right>$ (%) = 6.8 $\pm$ 1.3 (stat.) $\pm$ 2.1 (syst.) for Au+Au and $\left< P_{\Lambda}\right>$ (%) = 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. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 0370-2693 1873-2445 |
| العلاقة: | Physics Letters. B, T. 835; https://ruj.uj.edu.pl/xmlui/handle/item/308105Test |
| DOI: | 10.1016/j.physletb.2022.137506 |
| الإتاحة: | https://doi.org/10.1016/j.physletb.2022.137506Test https://ruj.uj.edu.pl/xmlui/handle/item/308105Test |
| حقوق: | Udzielam licencji. Uznanie autorstwa 4.0 Międzynarodowa ; http://creativecommons.org/licenses/by/4.0/legalcode.plTest |
| رقم الانضمام: | edsbas.3E2CC256 |
| قاعدة البيانات: | BASE |
Full Text Finder | تدمد: | 03702693 18732445 |
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| DOI: | 10.1016/j.physletb.2022.137506 |