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T: Fachverband Teilchenphysik

T 28: Top quark production II

T 28.8: Vortrag

Dienstag, 16. März 2021, 17:45–18:00, Tc

Determination of Background from Misreconstructed Electrons in ttγ topologies with the ATLAS detector — Ivor Fleck, •Buddhadeb Mondal, and Carmen Diez Pardos — Center for Particle Physics Siegen, Experimentelle Teilchenphysik, Universität Siegen

An effort is ongoing on measuring inclusive and differential cross-sections of the ttγ production in pp collision at √s=13 TeV with 139 fb⁻¹ data collected by the ATLAS detector at CERN. One of the background sources comes from the misidentification of electrons as photons (e→γ fake). This happens mainly due to tracking inefficiency or failure to find a match between inner detector track and electromagnetic cluster. The e→γ fakes are not well described by Monte Carlo simulations. In this talk, a method to estimate the e→γ fake based on data using a "tag and probe" approach with Z→ e⁺e⁻ events will be presented.