Experimental status of CPV in $B_s^0$ mixing

TL;DR

This paper reports the latest experimental measurements of CP violation and related parameters in $B_s^0$ meson decays from LHC experiments, confirming consistency with Standard Model predictions.

Contribution

It provides new combined measurements of CP-violating phase, width difference, and decay width of $B_s^0$ mesons at 13 TeV, including data from ATLAS, CMS, and LHCb.

Findings

Measured CP-violating phase $_s$ consistent with Standard Model

Determined width difference $ riangle ext{ extGamma}_s$ and decay width $ ext{ extGamma}_s$

Combined results with 8 TeV data reinforce Standard Model agreement

Abstract

This proceeding contribution presents the latest measurement of the CP-violation and other physics parameters in the $B_s^0 \to J/\psi \phi$ decay channel performed by the ATLAS, CMS and LHCb experiments. The measurements are based on a data set collected at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV. Besides the CP violating phase $\phi_s$, the width difference between the $B_{s}^0$ meson mass eigenstates $\Delta\Gamma_s$ and the average decay width $\Gamma_s$ are measured. The measured values are then combined with those collected at 8 TeV. The measurements are consistent with theoretical predictions based on the Standard Model.