Commissioning of the Charged Lepton Identification with Cosmic Rays in ATLAS

Efficient identification of charged leptons will be a key to the study of many physics processes at the Large Hadron Collider (LHC). The ATLAS detector at the LHC has excellent charged lepton identification capabilities. In the years 2008 and 2009, 300 million cosmic ray events were recorded by the ATLAS detector. These data were used to fully commissioning the muon identification algorithms, to prove the power of the electron identification algorithm and to partially commissioning the tau lepton identification.