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T: Fachverband Teilchenphysik

T 99: Dark Matter IV

T 99.2: Vortrag

Freitag, 3. April 2020, 11:15–11:30, H-HS XIV

Estimation of non-prompt and fake leptons in searches for dark matter associated production with Wt+MET — •Marianna Liberatore — DESY

In regions with multiple leptonic final states, estimating the number of events containing non-prompt (leptons inside a jet) and misidentified (fake) leptons (other particles faking leptons) represents a crucial issue. Given that Monte Carlo simulations of processes with fake leptons are unreliable or computationally expensive, data-driven methods are considered instead. In this talk are presented the first results of fake leptons background estimation using one of these methods, called the matrix method. The estimation is done for a search for dark matter in associated production with a single top quark. The search is focused on final states including one or two leptons and high missing transverse energy. Data collected with the ATLAS experiment at √s=13 TeV during LHC Run-2 (2015-2018) are used and correspond to an integrated luminosity of 139 fb⁻¹.