Measurement of the $CP$ violating phase ${\varphi }_s$ and ${\varphi }_s^{sq\bar{q}}$ at LHCb

Abstract

Precise measurements of the $B_s^0-{\overline{B}}_s^0$ mixing parameters provide a powerful test of the Standard Model, offering potential hints to new physics. The LHCb collaboration has performed updated measurements of the $CP$-violating phases ${\varphi }_s^{c\bar{c}s}$ and ${\varphi }_s^{s\bar{s}s}$, which supersede previous results. Also, an alternative approach to determine $\Delta {\Gamma }_s$ is presented, bringing a new tool that may help to resolve the tension observed between measurements made in $B_s^0\to J/\psi \varphi$ by LHC experiments.

arXiv comment9 pages, 5 figures, Presented at the 12th Workshop on the CKM Unitarity Triangle, 18-22 September 2023, Santiago de Compostela