https://doi.org/10.1051/epjconf/202431204004
Precision measurements of B-meson decays at ATLAS
Institute of Particle and Nuclear Physics, Faculty of Mathematics and Physics, Charles University, V Holešovicˇkách 2, 18000 Prague 8, Czech Republic
* e-mail: marek.biros@cern.ch
Published online: 20 November 2024
The precise measurement of the CP-violating phase ϕs, the average decay width Γs and the difference between the widths of the light and heavy mass eigenstates ΔΓs is presented in the $${B_s^0} $$
→ J/ψϕ decay channel. Data of pp collisions at √s = 13 TeV are used, corresponding to 80.5 fb−1 of integrated lu-minosity collected by the ATLAS detector at the Large Hadron Collider in years 2015–2017. Results are statistically combined with the previous measurement with 19.2 fb−1 data with 7 and 8 TeV energy. The measured values are:
ϕs = −0.087 ± 0.036 (stat.) ± 0.021 (syst.)
Γs = 0.6703 ± 0.0014 (stat.) ± 0.0018 (syst.)
ΔΓs = 0.0657 ± 0.0043 (stat.) ± 0.0037 (syst.).
Moreover, a study estimating the ATLAS detector performance in measuring the CP-violating phase ϕs after the HL-LHC upgrade is presented.
© The Authors, published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
