Description
When examining collision events in particle collider experiments such as the ATLAS experiment at CERN, it is important to understand all processes that can give rise to a specific final state. This is often performed by studying Monte Carlo generated events to model Standard Model processes. We can model the hard scattering processes, but it is also important to consider the detector mis-identifying particles. This is very common when studying multi-lepton final states and Monte Carlo often struggles to model these "fake" leptons. For this, we can use data-driven methods such as the Fake Factor estimation to "model" the fake lepton background. This talk will describe the determination of the background of fake leptons in a 3 Lepton + Missing Transverse Energy (MET) final state using the Fake Factor method. We analyse events to search for long-lived Dark Matter candidates in an Electroweak SUSY scenario. Our signal topology contains a Z boson, which decays to either a pair of muons or electrons, and a W boson, decaying to a neutrino and an electron or muon. The neutrino and dark matter candidates would then appear as a MET signal in the detector. The backgrounds most enriched in fake leptons are Z + jets, where a jet is mistakenly identified by the detector as a lepton, Z + photon, where the photon converts to an electron/positron pair, and “top-like backgrounds” where a b-jet is misidentified as a lepton. In this talk I will summarise the status of the lepton fake factor work and future prospects of utilising these techniques to assist in searches for physics beyond the Standard Model.
| I am the presenting author | Yes |
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