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T: Fachverband Teilchenphysik

T 76: Search for Dark Matter 3

T 76.1: Talk

Wednesday, March 23, 2022, 16:15–16:30, T-H35

Search for dark matter production in association with a single-top and w-boson with the ATLAS experiment — •Alvaro Lopez Solis — DESY-Zeuthen, Zeuthen, Germany

Measurements at large scales suggest that Dark Matter (DM) constitutes around 27% of all the energy available in the Universe and around 85% of all the available mass. However, its nature remains a mystery. Several theories try to address this problem by suggesting the existence of new weakly interacting particles that would constitute most of this new type of energy. This talk will present a search using the ATLAS experiment at LHC for these weakly interacting particles. It is motivated by the hypothesis that DM particles would couple to the Standard Model (SM) particles via a pseudo-scalar mediator within an extended two-Higgs-doublet model (2HDM+a). Among all the possible signatures predicted by this model, this talk will present the search for DM production in association to a single-top quark and a W-boson in channels where both, top and W-boson, are assumed to decay hadronically (0L channel) or either one of them decay leptonically (1L channel).