CP asymmetries tests in $t\bar{t}$ production with the ATLAS detector at the LHC

Top quark pair events provide a source of $b$-hadrons where the charge of the $b$-quark at production can be inferred from the lepton from the top-quark decay. We present a measurement of same- and opposite-sign charge asymmetries measured in $t\bar{t}$ events collected with the ATLAS detector in pp collisions at 8 TeV. The charge asymmetries are based on the charge of the lepton from the top-quark decay and the charge of the soft muon from the semileptonic decay of a $b$-hadron. Four CP asymmetries (one mixing and three direct) are extracted and are found to be compatible with zero and consistent with the Standard Model.