Search for $$ CP $$ violation in events with top quarks and Z bosons at $$\sqrt {s} $$= 13 and 13.6 TeVCP violation in events with top quarks and Z bosons at s= 13 and 13.6 TeV
Yazarlar (1)
Prof. Dr. Hasan OĞUL Sinop Üniversitesi, Türkiye
| Makale Türü | Özgün Makale (SSCI, AHCI, SCI, SCI-Exp dergilerinde yayınlanan tam makale) | ||
| Dergi Adı | Physics Letters B (Q1) | ||
| Makale Dili | – | Basım Tarihi | 09-2025 |
| Cilt / Sayı / Sayfa | 0 / 0 / 139857–0 | DOI | – |
| Makale Linki | https://www.sciencedirect.com/science/article/pii/S0370269325006021 | ||
| UAK Araştırma Alanları |
Nükleer Fizik
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| Özet |
| A search for the violation of the charge-parity (CP) symmetry in the production of top quarks in association with Z bosons is presented, using events with at least three charged leptons and additional jets. The search is performed in a sample of proton-proton collision data collected by the CMS experiment at the CERN LHC in 2016–2018 at a center-of-mass energy of 13 TeV and in 2022 at 13.6 TeV, corresponding to a total integrated luminosity of 173 f b− 1. For the first time in this final state, observables that are odd under the CP transformation are employed. Also for the first time, physics-informed machine-learning techniques are used to construct these observables. While for standard model (SM) processes the distributions of these observables are predicted to be symmetric around zero, CP-violating modifications of the SM would introduce asymmetries. Two CP-odd operators O t W I and O t Z I in the SM effective … |
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