Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 65: Experimentelle Methoden II

T 65.2: Talk

Wednesday, March 27, 2019, 16:15–16:30, S01

Tau Trigger Efficiency Measurements using Z → τ τ Events at ATLAS — •Kieran Amos, Serhat Ördek, Michel Janus, and Stan Lai — II. Physikalisches Institut, Georg-August-Universität Göttingen

Experiments with the ATLAS detector involving tau leptons in the final state use the tau trigger system for the online selection. This trigger system must accommodate the high instantaneous luminosity achieved during the LHC’s run in 2018. In this talk, the Z → τ τ tag and probe analysis used to determine the tau trigger efficiency will be dicussed. For each event a single muon (tag) is required, and the tau trigger efficiency is then calculated from the fraction of events where the accompanying hadronic tau decay candidate (probe) passes the trigger. The dependency of the efficiency on the transverse momentum and the pseudorapidity of the tau candidate as well as the average number of interactions per bunch-crossing is presented. The talk discusses the challenges involved in implementing the method as well as possible future improvements.