Szczegóły publikacji
Opis bibliograficzny
Global polarization of $\Lambda$ and $\bar{\Lambda}$ hyperons in Au+Au collisions at $\sqrt{s_{NN}}$=19.6 and 27 GeV / M. I. Abdulhamid, [et al.], L. ADAMCZYK, [et al.], M. PRZYBYCIEŃ, [et al.] // Physical Review. C ; ISSN 2469-9985. — Tytuł poprz.: Physical Review. C, Nuclear Physics ; ISSN: 0556-2813. — 2023 — vol. 108 iss. 1 art. no. 014910, s. 014910-1–014910-9. — Bibliogr. s. 014910-8–014910-9, Abstr. — Publikacja dostępna online od: 2023-07-27
Autorzy (376)
- AGHAdamczyk Leszek
- AGHPrzybycień Mariusz
- Abdulhamid M. I.
Dane bibliometryczne
| ID BaDAP | 149587 |
|---|---|
| Data dodania do BaDAP | 2023-11-21 |
| Tekst źródłowy | URL |
| DOI | 10.1103/PhysRevC.108.014910 |
| Rok publikacji | 2023 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Physical Review, C |
Abstract
In relativistic heavy-ion collisions, a global spin polarization, PH, of Λ and ¯¯¯Λ 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 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 P¯¯¯Λ−PΛ<0.24% and P¯¯¯Λ−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.
