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  • Global Λ-hyperon polarizati...
    Aboona, B. E.; Adamczyk, L.; Atetalla, F. G.; Bielcikova, J.; Butterworth, J.; Chakaberia, I.; Chaloupka, P.; Chang, Z.; Chattopadhyay, S.; Chen, J.; Csanád, M.; Dedovich, T. G.; Dong, X.; Esumi, S.; Eyser, O.; Fawzi, F. M.; Fazio, S.; Federic, P.; Fedorisin, J.; Filip, P.; Fisyak, Y.; Ghimire, N.; Gopal, K.; Gou, X.; Hamad, A. I.; Holub, L.; Huang, H.; Huang, Y.; Isenhower, D.; Jena, C.; Jentsch, A.; Kabana, S.; Kapukchyan, D.; Kelsey, M.; Khyzhniak, Y. V.; Kim, C.; Kimelman, B.; Knospe, A. G.; Ko, H. S.; Kosarzewski, L. K.; Li, Y.; Licenik, R.; Liu, F.; Liu, T.; Ljubicic, T.; Lukow, N. S.; Magdy, N.; Minaev, N. G.; Mohanty, B.; Morozov, D. A.; Nelson, J. M.; Nemes, D. B.; Nogach, L. V.; Ogawa, A.; Oh, S.; Pak, R.; Pan, J.; Pandey, A. K.; Pluta, J.; Porter, J.; Prozorova, V.; Pruthi, N. K.; Raha, N.; Ray, R. L.; Ritter, H. G.; Rogachevskiy, O. V.; Ruan, L.; Rusnak, J.; Sako, H.; Sandweiss, J.; Shah, N.; Shanmuganathan, P. V.; Sheikh, A. I.; Shen, D.; Shou, Q. Y.; Sikora, R.; Singha, S.; Skoby, M. J.; Sorensen, P.; Stanislaus, T. S.; Stringfellow, B.; Summa, B.; Sun, X.; Sun, Y.; Surrow, B.; Svirida, D. N.; Tang, Z.; Trzeciak, B. A.; Underwood, D. G.; Vassiliev, I.; Voloshin, S. A.; Wang, Y.; Wen, L.; Westfall, G. D.; Wissink, S. W.; Yang, Q.; Ye, Z.; Yip, K.; Zhang, Y.; Zhao, J.

    Physical review. C, 12/2021, Letnik: 104, Številka: 6
    Journal Article

    Global hyperon polarization, $\bar{P}_H$, in Au+Au collisions over a large range of collision energy, $\sqrt{s_{NN}}$, has recently been measured and successfully reproduced by hydrodynamic and transport models with intense fluid vorticity of the Quark-Gluon Plasma (QGP). While naïve extrapolation of data trends suggests a large $\bar{P}_H$ as the collision energy is reduced, the behavior of $\bar{P}_H$ at small $\sqrt{s_{NN}}$ < 7.7 GeV is unknown. Operating the STAR experiment in fixed-target mode, we have measured the polarization of Λ hyperons along the direction of global angular momentum in Au+Au collisions at $\sqrt{s_{NN}}$ = 3 GeV. The observation of substantial polarization of 4.91±0.81(stat.)±0.15(syst.)% in these collisions may require a reexamination of the viscosity of any fluid created in the collision, the thermalization timescale of rotational modes, and of hadronic mechanisms to produce global polarization.