Abdallah, M. S. ; Galatyuk, Tetyana ; Harabasz, Szymon ; Seck, Florian
Hrsg.: STAR Collaboration (2021)
Global Λ-hyperon polarization in Au+Au collisions at √sNN = 3 GeV.
In: Physical Review C, 104 (6)
doi: 10.1103/PhysRevC.104.L061901
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Global hyperon polarization, ¯PH, in Au+Au collisions over a large range of collision energy, √sNN, was recently measured and successfully reproduced by hydrodynamic and transport models with intense fluid vorticity of the quark-gluon plasma. While naïve extrapolation of data trends suggests a large ¯PH as the collision energy is reduced, the behavior of ¯PH at small √sNN<7.7 GeV is unknown. Operating the STAR experiment in fixed-target mode, we measured the polarization of Λ hyperons along the direction of global angular momentum in Au+Au collisions at √sNN=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, of the thermalization timescale of rotational modes, and of hadronic mechanisms to produce global polarization.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2021 |
| Autor(en): | Abdallah, M. S. ; Galatyuk, Tetyana ; Harabasz, Szymon ; Seck, Florian |
| Art des Eintrags: | Bibliographie |
| Titel: | Global Λ-hyperon polarization in Au+Au collisions at √sNN = 3 GeV |
| Sprache: | Englisch |
| Publikationsjahr: | 21 Dezember 2021 |
| Verlag: | APS |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review C |
| Jahrgang/Volume einer Zeitschrift: | 104 |
| (Heft-)Nummer: | 6 |
| DOI: | 10.1103/PhysRevC.104.L061901 |
| Kurzbeschreibung (Abstract): | Global hyperon polarization, ¯PH, in Au+Au collisions over a large range of collision energy, √sNN, was recently measured and successfully reproduced by hydrodynamic and transport models with intense fluid vorticity of the quark-gluon plasma. While naïve extrapolation of data trends suggests a large ¯PH as the collision energy is reduced, the behavior of ¯PH at small √sNN<7.7 GeV is unknown. Operating the STAR experiment in fixed-target mode, we measured the polarization of Λ hyperons along the direction of global angular momentum in Au+Au collisions at √sNN=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, of the thermalization timescale of rotational modes, and of hadronic mechanisms to produce global polarization. |
| Zusätzliche Informationen: | Art.No.: L061901 |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Kernphysik 05 Fachbereich Physik > Institut für Kernphysik > Experimentelle Kernphysik 05 Fachbereich Physik > Institut für Kernphysik > Experimentelle Kernphysik > Untersuchung von Quark-Materie mit virtuellen Photonen |
| Hinterlegungsdatum: | 09 Nov 2023 11:20 |
| Letzte Änderung: | 13 Dez 2023 10:49 |
| PPN: | 514022752 |
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