Szczegóły publikacji
Opis bibliograficzny
Measurement of the CP-violating phase $\phi_{s}$ in the $B^{0}_{s}\to J/\psi\phi(1020)\to \mu^{+}\mu^{−} K^{+}K^{−}$ channel in proton-proton collisions at $\sqrt{s}=13$ TeV / A. M. Sirunyan, [et al], V. AVATI, L. GRZANKA, M. MALAWSKI, [et al.] // Physics Letters. B ; ISSN 0370-2693. — 2021 — vol. 816 art. no. 136188, s. 1–27. — Bibliogr. s. 10–11, Abstr. — Publikacja dostępna online od: 2021-03-03
Autorzy (2382)
- AGHAvati Valentina
- AGHGrzanka Leszek
- AGHMalawski Maciej
- Sirunyan A. M.
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 133434 |
|---|---|
| Data dodania do BaDAP | 2021-05-13 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.physletb.2021.136188 |
| Rok publikacji | 2021 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Physics Letters, B |
Abstract
The CP -violating weak phase ϕs and the decay width difference ΔΓs between the light and heavy Bs0 mass eigenstates are measured with the CMS detector at the LHC in a sample of 48500 reconstructed Bs0→J/ψϕ(1020)→μ+μ−K+K− events. The measurement is based on a data sample corresponding to an integrated luminosity of 96.4fb−1, collected in proton-proton collisions at s=13TeV in 2017–2018. To extract the values of ϕs and ΔΓs, a time-dependent and flavor-tagged angular analysis of the μ+μ−K+K− final state is performed. The analysis employs a dedicated tagging trigger and a novel opposite-side muon flavor tagger based on machine learning techniques. The measurement yields ϕs=−11±50(stat)±10(syst)mrad and ΔΓs=0.114±0.014(stat)±0.007(syst)ps−1, in agreement with the standard model predictions. When combined with the previous CMS measurement at s=8TeV, the following values are obtained: ϕs=−21±44(stat)±10(syst)mrad, ΔΓs=0.1032±0.0095(stat)±0.0048(syst)ps−1, a significant improvement over the 8 TeV result.