Probes of CP violation and rare decays in the heavy flavor sector at ATLAS

We present the results on CP-violation searches in the Bs system, studied in the decay into J/psi phi, using the Run-1 LHC dataset. We additionally present new results in the search for the rare decays of Bs and Bd into mu+mu-. Such processes involve FCNC transitions in b-hadron decays, suppressed in the standard model, and are sensitive to new physics contributions. These searches are based on the full sample of data collected by ATLAS at 7 and 8 TeV collision energy. The consistency with the SM and with other available measurements is discussed.