Calorimeter Performance for Tau Reconstruction and Identification at ATLAS

The ATLAS tau physics program ranges from Standard Model measurements involving W, Z, and top pair production, to searches for Higgs, Supersymmetry and other beyond the Standard Model signatures. The ATLAS calorimeter plays a large role in the reconstruction and identification of hadronically decaying tau leptons at ATLAS. This proceeding discusses the role of the calorimeter in reconstructing the tau energy, as well as methods to measure the systematic uncertainties on the tau energy scale. The calorimeter is further a key component in building identification variables used to differentiate tau candidates from hadronic jets. The role of these variables is presented, and challenges in correcting these variables in high luminosity environments is also discussed. A brief overview of the impact of the energy scale and identification efficiency uncertainties in searches for new physics with tau-based signatures is also given.