SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 48: Exp. Methods I

T 48.2: Vortrag

Dienstag, 21. März 2023, 17:15–17:30, WIL/C129

Photon identification efficiency measurement with the Matrix Method using 139 fb⁻¹ of data collected by the ATLAS experiment at √s = 13 TeV — •Nils Julius Abicht and Tomas Dado — Technische Universität Dortmund, Fakultät Physik

Photon identification (ID) is an integral part of many analyses, for example, measurements of Higgs boson properties or hypothetical pro cesses involving isolated photons in the final state. As the photon ID efficiency is not necessarily modeled well in Monte Carlo simulations, data-driven approaches are employed. One of these approaches is the Matrix Method, which estimates the efficiencies between a loose and a tight selection. For this selection, two sets of variables are used. The first set describes the longitudinal and lateral shape of the calorimeter shower and the second the topology of the center of the calorimeter shower. For calculating the photon ID efficiency, track isolation criteria that are weakly correlated with with the second set of variables are used. A description of the Matrix Method, the systematic uncertainties of the measurement as well as the resulting photon ID efficiencies and corrections to simulated efficiencies, calculated on full Run-2 samples, corresponding to 139 fb⁻¹, are presented.