Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 48: Methods in Particle Physics III

T 48.7: Vortrag

Mittwoch, 18. März 2026, 17:45–18:00, KH 00.020

Determining the τ-Lepton Efficiency in a Global Approach at the ATLAS Experiment — •Harilal Bhattarai, Philip Betchler, and Christian Grefe — Physikalisches Institut, Universität Bonn

The measurement of the hadronic τ-lepton identification efficiency at ATLAS is important for the proper modeling of signal and background processes, which directly impacts the sensitivity to Standard Model (SM) and BSM phenomena. In this approach, we will measure tau ID at a centre of mass energy √s = 13 TeV, across multiple channels such as Z → τ τ and W→ τ ν .

In this analysis, we use Run 2 data corresponding to an integrated luminosity of 139 fb⁻¹ and applying optimized selections on lepton isolation, tau p_T, η, and charge requirements to suppress backgrounds. We perform a global measurement of tau ID efficiencies and the corresponding Data-to-MC scale factors at ATLAS for 1-prong and 3-prong τ candidates using the HAPPy and ROOT frameworks. In this talk, we will present the efficiencies and scale factors.

Keywords: ATLAS; Tau Lepton; Global Approach; Tau Identification; Run2