Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 53: Electroweak Interactions I

T 53.6: Talk

Wednesday, March 17, 2021, 17:15–17:30, Tc

Data-driven methods for the estimation of the non-prompt lepton background for the W⁺W⁻ measurement with the ATLAS detector — •José Antonio Fernández Pretel — Albert-Ludwigs Universität Freiburg, Freiburg im Breisgau, Deutschland

Fiducial and differential cross sections of W⁺W⁻ pair production are key measurements to test self-couplings predicted by the electroweak sector of the Standard Model, but also to validate QCD corrections and to accurately estimate important background contributions to other measurements such as Higgs boson decays into W boson pairs. Single W boson production in association with jets can contribute to the selected W⁺W⁻ candidate events when an associated jet is misreconstructed as a lepton. These are referred to as "non-prompt" or "fake" leptons. Due to the production cross section of W+jet, orders of magnitude larger than diboson W⁺W⁻, these contributions become an important background for this measurement, corresponding to about 10