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Search for dark matter produced in association with a single top quark in √s=13 TeV pp collisions with the ATLAS detector

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  • ATLAS Collaboration
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Article number860
<mark>Journal publication date</mark>1/10/2021
<mark>Journal</mark>European Physical Journal C
Issue number10
Volume81
Number of pages37
Publication StatusPublished
<mark>Original language</mark>English

Abstract

This paper presents a search for dark matter in the context of a two-Higgs-doublet model together with an additional pseudoscalar mediator, a, which decays into the dark-matter particles. Processes where the pseudoscalar mediator is produced in association with a single top quark in the 2HDM+a model are explored for the first time at the LHC. Several final states which include either one or two charged leptons (electrons or muons) and a significant amount of missing transverse momentum are considered. The analysis is based on proton–proton collision data collected with the ATLAS experiment at s√=13 TeV during LHC Run 2 (2015–2018), corresponding to an integrated luminosity of 139 fb−1. No significant excess above the Standard Model predictions is found. The results are expressed as 95% confidence-level limits on the parameters of the signal models considered.