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Recent results of the ATLAS experiment at LHC on decay properties of b-hadrons are reviewed. The timedependent CP asymmetry parameters have been measured in B 0 s → J/ψφ decays using flavour tagging. The parityviolating decay asymmetry parameter α b and the helicity amplitudes have been measured for the decay Λ 0 b → J/ψΛ 0 . The branching fraction B(B + → χ c1 K + ) has been measured with χ c1 reconstruction in the decay χ c1 → J/ψγ. An excited B ± c state has been observed through its decaysdoi:10.1016/j.nuclphysbps.2015.09.227 fatcat:zmpgydylejfyxgp7ld6eyc2hdy