Hadronic calorimetry and jet/τ/ETmiss performance studies in ATLAS

Jets, τ jets, and missing transverse energy are important components of the physics expected at the LHC. The accurate measurement of the direction and energy of jets, along with missing energy, impose strong requirements upon the performance of the ATLAS detector system. These requirements and the ATLAS Hadronic Calorimetry system are reviewed. A brief discussion of the jet reconstruction algorithms, jet energy scale calibration, and forward jet tagging is also included. The methods and expected accuracy by which τ jets are reconstructed and identified is covered. The expected ETmiss resolution and minimization of fake high ETmiss tails is presented. (orig.)