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PoS - Proceedings of Science
Volume 390 - 40th International Conference on High Energy physics (ICHEP2020) - Parallel: Quark and Lepton Flavour Physics
Measurement of the weak mixing phase ϕs through time-dependent CP violation in B0sJ/ψϕ decay in ATLAS
T. Jakoubek*  on behalf of the ATLAS Collaboration
Full text: pdf
Pre-published on: February 25, 2021
Published on: April 15, 2021
Abstract
An updated measurement of time-dependent CP asymmetry parameters in B0sJ/ψ(μ+μ)ϕ(K+K) decays using 80.5 fb1 of integrated luminosity collected with the ATLAS detector during 2015-2017 from 13 TeV pp collisions at the LHC is presented. In the Standard Model, CP violation arises due to a single complex phase in the CKM quark mixing matrix. Precise measurements of the CKM parameters therefore constrain the Standard Model, and may reveal new physics effects. Results presented in this talk are compatible with those obtained from 19.2 fb1 of 7 TeV and 8 TeV ATLAS data as well as with the Standard Model predictions and other LHC experiments. The measurement of the weak mixing phase ϕs improves on the precision of the previous ATLAS result by a factor of two.
DOI: https://doi.org/10.22323/1.390.0387
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