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

Precise measurements of the $B_s^0-{\bar{B}}_s^0$ 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 ${\phi }_s^{c\bar{c}s}$ and ${\phi }_s^{s\bar{s}s}$, which supersede previous results. Also, an alternative approach to determine $\mathrm{\Delta }{\mathrm{\Gamma }}_s$ is presented, bringing a new tool that may help to resolve the tension observed between measurements made in $B_s^0\to J\mathrm{/}\psi \phi$ by LHC experiments.