Szczegóły publikacji
Opis bibliograficzny
Observation of $\Lambda$ hyperon local polarization in p-Pb collisions at $\sqrt{s_{NN}}=8.16$ TeV / A. Hayrapetyan, [et al.], V. AVATI, L. GRZANKA, M. MALAWSKI, [et al.] // Physical Review Letters ; ISSN 0031-9007 . — 2025 — vol. 135 iss. 13, s. 132301-1-132301-21. — Bibliogr. s. 132301-6-132301-8, Abstr. — Publikacja dostępna online od: 2025-09-23
Autorzy (2405)
- AGHAvati Valentina
- AGHGrzanka Leszek
- AGHMalawski Maciej
- Hayrapetyan Aram
Dane bibliometryczne
| ID BaDAP | 166197 |
|---|---|
| Data dodania do BaDAP | 2026-03-12 |
| Tekst źródłowy | URL |
| DOI | 10.1103/6ywq-gm61 |
| Rok publikacji | 2025 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp | |
| Creative Commons | |
| Czasopismo/seria | Physical Review Letters |
Abstract
The polarization of the Λ and ¯ Λ hyperons along the beam direction has been measured in proton-lead (𝑝-Pb ) collisions at a center-of-mass energy per nucleon pair of 8.16 TeV. The data were obtained with the CMS detector at the LHC and correspond to an integrated luminosity of 186.0±6.5 nb−1 . A significant azimuthal dependence of the hyperon polarization, characterized by the second-order Fourier sine coefficient 𝑃𝑧,s2 , is observed. The 𝑃𝑧,s2 values decrease as a function of charged particle multiplicity, but increase with transverse momentum. A hydrodynamic model that describes the observed 𝑃𝑧,s2 values in nucleus-nucleus collisions by introducing vorticity effects does not reproduce either the sign or the magnitude of the 𝑝-Pb results. These observations pose a challenge to the current theoretical implementation of spin polarization in heavy ion collisions and offer new insights into the origin of spin polarization in hadronic collisions at LHC energies.