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Testing the new physics scale in the B system at ATLAS

— Weak decays that are naturally suppressed in the Standard Model (SM), such as processes with flavour-changing neutral currents, are perfect for indirect searches of new physics. These decays allow us to investigate higher energy ranges with respect to direct searches thus representing a fundamental complementary tool. Results on the ATLAS analysis of the B s → μ+μ− rare decay will be presented. The ATLAS study of B d → K∗0μ+μ− is also reported where the parameters AFB and FL are extracted from the angular distribution of the final state. The measurement of the φs phase in the B 0 s → J/ψ φ system, that can provide probes for physics beyond the SM, is showed too.