Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 31: Methods in particle physics 3 (lepton reconstruction)

T 31.6: Talk

Tuesday, March 5, 2024, 17:15–17:30, Geb. 20.30: 2.066

Investigating Shower Generator Dependence of Muon Isolation Efficiency for the ATLAS Collaboration — •Lars Linden¹, Stylianos Angelidakis², Christoph Ames¹, Youn Jun Cho¹, Stefanie Götz¹, Edis Hrustanbegovic¹, Celine Stauch¹, Lukas von Stumpfeldt¹, and Otmar Biebel¹ — ¹Ludwig-Maximilians-Universität, München — ²National and Kapodistrian University, Athens

Muons originating from bosons are of vital importance for various physics analyses, therefore exact knowledge of the expected efficiencies of both the detectors and algorithms is important. In ATLAS simulations, the isolation efficiency exhibits a dependency on the parton shower generator model used. The corresponding differences for the PYTHIA and Sherpa generators used in simulation contribute a significant systematic uncertainty in muon isolation efficiency measurements. Because of this, the generator dependence is investigated using Z → µ µ samples generated using POWHEGBOX + PYTHIA 8 and Sherpa 2.2.11 Monte Carlo generators This talk presents the results of studies investigating the effect of shower generator differences on variables relevant for muon isolation algorithms.