# Time-dependent CP violation in $B_s^0$ decays at LHCb

## TL;DR

This paper reports measurements of time-dependent CP violation in $B_s^0$ decays at LHCb, focusing on the phase $\,phi_s$ and angular analyses of specific decay channels using data from 2011-2016.

## Contribution

It presents the first angular analysis of $B_s^0
ightarrow \,phi \,phi$ and measurements of CP violation in $B_s^0
ightarrow J/\,psi h^+h^-$ decays at LHCb.

## Key findings

- Measurement of the CP-violating phase $\,phi_s$
- Angular analysis results for $B_s^0
ightarrow \,phi \,phi$
- CP violation parameters in $B_s^0
ightarrow J/\,psi h^+h^-$ decays

## Abstract

The $B_s^0-\bar{B}_s^0$ system can be used to look for new sources of CP violation. Time-dependent CP violation measurements of beauty mesons allow the determination of the mixing induced CP-violating phase, $\phi_s$. The angular analysis of the $B_s^0\rightarrow \phi \phi$ decay is presented, along with two $B_s^0\rightarrow J/\psi h^+h^-$ decays, where the two hadrons are either a pair of kaons or a pair of pions. The analyses are based on data collected with the LHCb detector between $2011$ and $2016$.