| Titel: | Global polarization of Λ and Λ[bar] hyperons in Au+Au collisions at √sNN=19.6 and 27 GeV |
|---|---|
| Mitwirkende: | Abdulhamid, Muhammad Ibrahim [VerfasserIn] |
| Deppner, Ingo Martin [VerfasserIn] | |
| Herrmann, Norbert [VerfasserIn] | |
| Leung, Yue [VerfasserIn] | |
| Söhngen, Yannick [VerfasserIn] | |
| Weidenkaff, Philipp [VerfasserIn] | |
| Körperschaft: | STAR Collaboration [VerfasserIn] |
| Verf.angabe: | STAR Collaboration* |
| E-Jahr: | 2023 |
| Jahr: | 27 July 2023 |
| Umfang: | 9 S. |
| Illustrationen: | Illustrationen |
| Fussnoten: | *STAR Collaboration: M.I. Abdulhamid, I.M. Deppner, N. Herrmann, Y.H. Leung, Y. Söhngen, P.C. Weidenkaff [und 370 weitere Personen] ; Im Titel steht der zweite Buchstabe Lambda mit einem Oberstrich ; Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol ; Gesehen am 30.01.2024 |
| Titel Quelle: | Enthalten in: Physical review |
| Ort Quelle: | Woodbury, NY : Inst., 2016 |
| Jahr Quelle: | 2023 |
| Band/Heft Quelle: | 108(2023), 1, Artikel-ID 014910, Seite 1-9 |
| ISSN Quelle: | 2469-9993 |
| Abstract: | In relativistic heavy-ion collisions, a global spin polarization, PH, of Λ and Λ[bar] hyperons along the direction of the system angular momentum was discovered and measured across a broad range of collision energies and demonstrated a trend of increasing PH with decreasing √sNN. A splitting between Λ and Λ[bar] polarization may be possible due to their different magnetic moments in a late-stage magnetic field sustained by the quark-gluon plasma which is formed in the collision. The results presented in this study find no significant splitting at the collision energies of √sNN=19.6 and 27 GeV in the BNL Relativistic Heavy Ion Collisions Beam Energy Scan Phase II using the STAR detector, with an upper limit of PΛ[bar]−PΛ<0.24% and PΛ[bar]−PΛ<0.35%, respectively, at a 95% confidence level. We derive an upper limit on the naive extraction of the late-stage magnetic field of B<9.4×1012 T and B<1.4×1013 T at √sNN=19.6 and 27 GeV, respectively, although more thorough derivations are needed. Differential measurements of PH were performed with respect to collision centrality, transverse momentum, and rapidity. With our current acceptance of |y|<1 and uncertainties, we observe no dependence on transverse momentum and rapidity in this analysis. These results challenge multiple existing model calculations following a variety of different assumptions which have each predicted a strong dependence on rapidity in this collision-energy range. |
| DOI: | doi:10.1103/PhysRevC.108.014910 |
| URL: | Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt. Volltext: https://doi.org/10.1103/PhysRevC.108.014910 |
| Volltext: https://link.aps.org/doi/10.1103/PhysRevC.108.014910 | |
| DOI: https://doi.org/10.1103/PhysRevC.108.014910 | |
| Datenträger: | Online-Ressource |
| Sprache: | eng |
| K10plus-PPN: | 1879523477 |
| Verknüpfungen: | → Zeitschrift |