Adam, J. ; Galatyuk, Tetyana ; Harabasz, Szymon ; Seck, Florian
Hrsg.: STAR Collaboration (2021)
Global Polarization of Ξ and Ømega Hyperons in Au+Au Collisions at √sNN = 200 GeV.
In: Physical Review Letters, 126 (16)
doi: 10.1103/PhysRevLett.126.162301
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Global polarization of Ξ and Ω hyperons has been measured for the first time in Au+Au collisions at √sNN=200 GeV. The measurements of the Ξ− and ¯Ξ+ hyperon polarization have been performed by two independent methods, via analysis of the angular distribution of the daughter particles in the parity violating weak decay Ξ→Λ+π, as well as by measuring the polarization of the daughter Λ hyperon, polarized via polarization transfer from its parent. The polarization, obtained by combining the results from the two methods and averaged over Ξ− and ¯Ξ+, is measured to be ⟨PΞ⟩=0.47±0.10(stat)±0.23(syst)% for the collision centrality 20%–80%. The ⟨PΞ⟩ is found to be slightly larger than the inclusive Λ polarization and in reasonable agreement with a multiphase transport model. The ⟨PΞ⟩ is found to follow the centrality dependence of the vorticity predicted in the model, increasing toward more peripheral collisions. The global polarization of Ω, ⟨PΩ⟩=1.11±0.87(stat)±1.97(syst)% was obtained by measuring the polarization of daughter Λ in the decay Ω→Λ+K, assuming the polarization transfer factor CΩΛ=1.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2021 |
| Autor(en): | Adam, J. ; Galatyuk, Tetyana ; Harabasz, Szymon ; Seck, Florian |
| Art des Eintrags: | Bibliographie |
| Titel: | Global Polarization of Ξ and Ømega Hyperons in Au+Au Collisions at √sNN = 200 GeV |
| Sprache: | Deutsch |
| Publikationsjahr: | 23 April 2021 |
| Verlag: | APS Physics |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review Letters |
| Jahrgang/Volume einer Zeitschrift: | 126 |
| (Heft-)Nummer: | 16 |
| DOI: | 10.1103/PhysRevLett.126.162301 |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | Global polarization of Ξ and Ω hyperons has been measured for the first time in Au+Au collisions at √sNN=200 GeV. The measurements of the Ξ− and ¯Ξ+ hyperon polarization have been performed by two independent methods, via analysis of the angular distribution of the daughter particles in the parity violating weak decay Ξ→Λ+π, as well as by measuring the polarization of the daughter Λ hyperon, polarized via polarization transfer from its parent. The polarization, obtained by combining the results from the two methods and averaged over Ξ− and ¯Ξ+, is measured to be ⟨PΞ⟩=0.47±0.10(stat)±0.23(syst)% for the collision centrality 20%–80%. The ⟨PΞ⟩ is found to be slightly larger than the inclusive Λ polarization and in reasonable agreement with a multiphase transport model. The ⟨PΞ⟩ is found to follow the centrality dependence of the vorticity predicted in the model, increasing toward more peripheral collisions. The global polarization of Ω, ⟨PΩ⟩=1.11±0.87(stat)±1.97(syst)% was obtained by measuring the polarization of daughter Λ in the decay Ω→Λ+K, assuming the polarization transfer factor CΩΛ=1. |
| Zusätzliche Informationen: | Art.No.: 162301; Erratum Phys. Rev. Lett. 131, 089901 (2023) |
| 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 11:24 |
| Letzte Änderung: | 13 Dez 2023 11:22 |
| PPN: | 514024313 |
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