Tagging b-jets in ATLAS

The ability to identify jets containing b-hadrons is important for the high-pT physics program of a general-purpose experiment at the LHC such as ATLAS. This is in particular useful to select very pure top quark samples or for studying Standard Model or supersymmetric Higgs bosons which couple preferably to heavy objects. After a review of the algorithms used to identify b-jets, their anticipated performance is discussed as well as the impact of various critical ingredients such as the residual misalignments in the tracker. The prospects to measure the b-tagging performance in the first few hundreds of pb−1 of data with di-jet and ttbar events are presented. Finally two different physics use cases of b-tagging are summarised.