Performance of the Reconstruction and Identification of Hadronic Tau Decays in the ATLAS Experiment

Tau leptons play an important role in the physics program of the ATLAS experiment at the LHC. Identification of hadronically decaying taus is achieved by using multi-variate discriminants exploiting information from tracking and calorimeter detector components. The identification efficiencies are measured in W->tau+nu and Z->tau+tau events selected in data, and compared with the prediction of the Monte Carlo simulation. The energy scale uncertainties for taus are determined by investigating single hadron calorimeter response, as well as kinematic distributions in Z->tau+tau events.