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Top pair events provide a source of $b\bar{b}$ pairs, which can be used toprobe CP violation in heavy-flavour mixing and decay. In events where one ofthe $W$ bosons decays leptonically to an electron or muon, the charge of the$W$ boson can be used to determine unambiguously the charge of the accompanying$b$-quark at the time of its production. In cases where the $b$-quark alsodecays semileptonically to a muon, this sample allows to probe two chargeasymmetries constructed with the charge signs of the $W$ and the soft muon. Thefirst measurement of the charge asymmetries in $b\bar{b}$ from top pair decaysis hence presented using the data collected with the ATLAS detector during the8 TeV run of the LHC.

Test of CP Violation in $b\bar{b}$ pairs from top quark decay