Speaker
Description
The talk will give an overview of recent $B$-physics measurements at the ATLAS experiment, with a focus on the $CP$ violation in $B^0_s \rightarrow J/\psi(\mu^+\mu^−)\phi(K^+K^−)$ decay channel. In the Standard Model $CP$ violation is described by a phase in the CKM matrix. One of the manifestations of this complex phase is a phase shift between direct and mixing-mediated $B_s$ decays producing a common final state. In the case of $B^0_s \rightarrow J/\psi(\mu^+\mu^−)\phi(K^+K^−)$ this phase shift is predicted to be small $\phi_s = -0.0368 \pm 0.0018$ rad. New physics can enhance $\phi_s$ whilst satisfying all existing constraints. Results presented in this talk are compatible with the Standard Model predictions and with other LHC measurements.
