Szczegóły publikacji
Opis bibliograficzny
Measurements of polarization and spin correlation and observation of entanglement in top quark pairs using lepton + jets events from proton-proton collisions at $\sqrt{s}$=13TeV / A. Hayrapetyan, [et al.], V. AVATI, L. GRZANKA, M. MALAWSKI, [et al.] // Physical Review . D ; ISSN 2470-0010. — Tytuł poprz.: Physical Review D. Particles, fields, gravitation, and cosmology ; ISSN: 1550-7998. — 2024 — vol. 110 iss. 11 art. no. 112016, s. 112016-1-112016-49. — Bibliogr. s. 112016-34-112016-37, Abstr. — Publikacja dostępna online od: 2024-12-30
Autorzy (2396)
- AGHAvati Valentina
- AGHGrzanka Leszek
- AGHMalawski Maciej
- Hayrapetyan Aram
Dane bibliometryczne
| ID BaDAP | 158838 |
|---|---|
| Data dodania do BaDAP | 2025-04-11 |
| Tekst źródłowy | URL |
| DOI | 10.1103/PhysRevD.110.112016 |
| Rok publikacji | 2024 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Physical Review, D |
Abstract
Measurements of the polarization and spin correlation in top quark pairs (𝑡 ¯ 𝑡 ) are presented using events with a single electron or muon and jets in the final state. The measurements are based on proton-proton collision data from the LHC at √𝑠 =13 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 138 fb−1. All coefficients of the polarization vectors and the spin correlation matrix are extracted simultaneously by performing a binned likelihood fit to the data. The measurement is performed inclusively and in bins of additional observables, such as the mass of the 𝑡 ¯ 𝑡 system and the top quark scattering angle in the 𝑡 ¯ 𝑡 rest frame. The measured polarization and spin correlation are in agreement with the standard model. From the measured spin correlation, conclusions on the 𝑡 ¯ 𝑡 spin entanglement are drawn by applying the Peres-Horodecki criterion. The standard model predicts entangled spins for 𝑡 ¯ 𝑡 states at the production threshold and at high masses of the 𝑡 ¯ 𝑡 system. Entanglement is observed for the first time in events at high 𝑡 ¯ 𝑡 mass, where a large fraction of the 𝑡 ¯ 𝑡 decays are spacelike separated, with an expected and observed significance of above 5 standard deviations.
