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T: Fachverband Teilchenphysik

T 74: Andere Gebiete der Experimentellen Teilchenphysik 2

T 74.1: Gruppenbericht

Dienstag, 10. März 2009, 16:45–17:05, A022

Reconstruction and identification of hadronic τ decays with ATLAS — •Wolfgang Mader — IKTP, TU Dresden, 01062 Dresden

The overall performance for identification and measurements with hadronic decays of τ leptons in a wide dynamic range of transverse energies, spanning from (10-15) GeV up to at least 500 GeV, with the ATLAS detector at the LHC is presented.

In general, hadronically decaying τ leptons are reconstructed by matching narrow calorimetric clusters with a small number of tracks. Two complementary approaches, the calorimeter-seeded and the track-seeded algorithm, have been developed to efficiently reconstruct these decays while providing the required large rejection rates against otherwise overwhelming backgrounds from QCD jets. Specific performance aspects of particular interest for the reconstruction of hadronic τ candidates are discussed, followed by a detailed presentation of the overall performance in terms of efficiency versus rejection rate of the large background from QCD jets expected at the LHC.

Prospects for the determination of fake rates from first data and for the extraction of the signals from W and Z boson decays as well as from tt pair production decaying into τ leptons with early data corresponding to 100 pb⁻¹ are also discussed.