Tests of Standard Model with beauty meson rare decay processes and CP-violation measurements at ATLAS

The ATLAS experiment has performed measurements of B-meson rare decays proceeding via suppressed electroweak flavour changing neutral currents, and of mixing and CP violation in the neutral $B^0_s$ meson system. This poster will focus on the latest results from the ATLAS collaboration, such as rare processes $B_s^0 \to \mu\mu$ and $B_0^d \to \mu\mu$, and CP violation in $B_s^0 \to J/\psi \phi$ decays, where the CP-violation phase $\phi_s$ can be measured together with the $B^0_s$ lifetime properties.