Abstract
Tau leptons play an important role in the physics program of the ATLAS experiment, operating at the LHC. They are used in searches for new phenomena like the Higgs boson and Supersymmetry and for electroweak measurements. Identification of hadronically decaying tau leptons is achieved by using detailed information from tracking and calorimetry. Variables describing the properties of calorimeter energy deposits and reconstructed tracks for tau candidates are combined into multi-variate discriminants, to achieve high rejection against backgrounds. The identification efficiencies are measured using W→τν and Z→ττ events, and compared with the prediction of the Monte Carlo simulation. The energy scale uncertainties for tau leptons are determined by investigating single hadron calorimeter response.
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