Abstract
Tau leptons play an important role in the physics program at the LHC. They are used in searches for new phenomena like the Higgs boson or Supersymmetry and in electroweak measurements. Identifying hadronically decaying tau leptons with good performance is an essential part of these analyses. We present the current status of the tau reconstruction and identification at the LHC with the ATLAS detector. The tau identification efficiencies and their systematic uncertainties are measured using W to tau nu and Z to tau tau events, and compared with the predictions from Monte Carlo simulations.
Highlights
Tau leptons are important signatures for Standard Model processes and searches for new physics
Tau leptons play an important role in the physics program at the LHC
We present the current status of the tau reconstruction and identification at the LHC with the ATLAS detector
Summary
Tau leptons are important signatures for Standard Model processes and searches for new physics. The tau lepton is the only lepton that has a hadronic decay mode. The kinematics of QCD jets are similar to that of hadronically decaying τ leptons, leading to a high potential probability for misidentifying them as tau leptons. In ATLAS [2], tau reconstruction and identification [3] concentrates on the hadronic decay modes of a tau lepton. They are classified according to the number of reconstructed charged decay particles (prongs). These decays can be differentiated from QCD jets by their characteristics, such as low track multiplicity, collimated energy deposits, and in case of 3-prong tau leptons the displacement of the secondary vertex. The systematic uncertainties on the tau energy scale are fully derived from Monte Carlo and were found to be 4%–7% [3]
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