Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 76: Dark Matter III

T 76.10: Talk

Thursday, April 2, 2020, 18:45–19:00, H-HS XIV

Search for dark matter production in association with a top quark and a W boson — •Baishali Dutta, Paul Moder, Priscilla Pani, and Claudia Seitz — DESY, Germany

Searches for dark matter are extensively pursued by the ATLAS experiment based on specific theoretical models of interest and with various experimental signatures. This talk presents a search for dark matter in association with a top quark and a W boson in the final state, a unique signature not covered by the ATLAS experiment so far. The analysis focuses on a two-Higgs-doublet model with an additional pseudo-scalar mediator, which decays to the dark matter candidates (2HDM+a) and utilises the full LHC Run-2 data collected by the ATLAS detector, comprising an integrated luminosity of 139 fb⁻¹ at a centre-of-mass energy of √s = 13 TeV.

The signal candidate events contain two W bosons, a b-tagged jet and a significant amount of missing transverse momentum due to the dark matter candidates escaping detection. Based on the subsequent decay of the two W bosons, the analysis is optimised individually for one or two leptons in the final state. The two channels are eventually combined to extend the sensitivity of the analysis to cover a large parameter space of the dark matter model considered. In this talk, the analysis strategy and interpretation of the obtained results are presented.