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T: Fachverband Teilchenphysik
T 111: Experimentelle Methoden 4 (Rekonstruktion)
T 111.6: Vortrag
Donnerstag, 30. März 2017, 18:00–18:15, JUR 253
Measurement of the τ-lepton trigger efficiency with tt-events with a tag-and-probe method with the ATLAS experiment at √s=13 TeV — •Katharina Schleicher, Duc Bao Ta, and Markus Schumacher — Albert-Ludwigs-Universität Freiburg
The study of final states containing hadronically-decaying τ-leptons plays an important role in investigating Standard Model as well as beyond Standard Model processes. To select such final states the ATLAS experiment uses dedicated τ-lepton identification and reconstruction algorithms already at the trigger level with very similar algorithms as for the offline analysis. The measurement of the trigger efficiency and the determination of MC-to-data correction factors has been performed so far using a tag-and-probe method using Z→ττ events. In order to complement the current method and to reach a higher transverse τ-lepton momentum range top-quark-pair events are utilised. Final states with two b-quarks, neutrinos, a µ-lepton (tag) and a hadronically decaying τ-lepton (probe) are investigated in the analysis presented here. The measurement has been performed on the full 2016 Run-2 data set in proton-proton collisions (L=33.3 fb−1) taken with the ATLAS detector at √s=13 TeV.