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The measurement of B meson decay properties provides an alternative approachfor searches for physics beyond the Standard Model. We present two differentmeasurements performed with data taken in 2011 with the ATLAS detector at theLarge Hadron collider. The first measurement is based on an angular analysis ofthe decay B->K*mumu, and in the second measurement the decay width differencedelta_Gamma_S and the weak phase phi_s of the Bs0 system is determined usingthe decay Bs->JPsiPhi. For the second measurement a probability for the flavourquantum number of the b_quark at production time is determined.

Angular analysis of the decay B->K*mumu and studies of mixing and CP-violation in the BS0 system with the ATLAS detector