Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 48: Methods in Particle Physics III

T 48.8: Vortrag

Mittwoch, 18. März 2026, 18:00–18:15, KH 00.020

Determination of Universal Tau Fake Factors for the Run 3 Data Taking Period of ATLAS — •Christian Schmidt, Arno Straessner, and Asma Hadef — Institut für Kern- und Teilchenphysik, Technische Universität Dresden

Tau leptons are an important product in collision events at the LHC; they primarily decay into a hadronic final state. Hadronic jets can easily produce similar signatures inside the ATLAS detector, leading to misidentified or "fake" taus, so it becomes necessary to estimate the fake tau background. The Fake Factor (FF) method estimates this background from data events with non-isolated tau candidates using a correction factor which depends on the transverse momentum of the tau candidate. In addition, the FF depends on the origin of the fake-producing jets, such as quark or gluon jets. Instead of measuring the FFs in a separate control region for each physics analysis, the Universal Fake Factor (UFF) method uses an estimate of the jet composition to linearly interpolate the FFs.

This talk will present the general principles of the UFF method, the process and data preparation being used to determine the UFF parameters in ATLAS Run 3 data, and current results.

Keywords: ATLAS; Tau; Run 3; Fake lepton background