ATLAS results with beauty mesons

Recent results from the ATLAS experiment on the $B_c$ production and decays will be presented. The measurement of the ratios of the $B_c^+$ and $B^+$ production cross sections in proton-proton collisions at 8 TeV will be discussed. The ATLAS experiment has performed accurate measurements of mixing and CP violation in the neutral $B$ mesons, and also of rare processes happening in electroweak FCNC-suppressed neutral $B$-mesons decays. This talk will also focus on the latest results from ATLAS, such as rare processes: $B^0_s\to\mu\mu$ and $B^0\to\mu\mu$; and CPV in the $B_s^0\to J/\psi\phi$ decays. In the latter, the Standard Model predicts the CP violating mixing phase, $\phi_s$, to be very small and its SM value is very well constrained, while in many new physics models large $\phi_s$ values are expected. Latest measurements of $\phi_s$ and several other parameters describing the $B_s^0\to J/\psi\phi$ decays will be reported.