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  1. Free, publicly-accessible full text available December 3, 2022
  2. Free, publicly-accessible full text available March 1, 2023
  3. null (Ed.)
  4. Free, publicly-accessible full text available November 1, 2022
  5. A correction to this paper has been published: 10.1140/epjc/s10052-021-09344-w
    Free, publicly-accessible full text available October 1, 2022
  6. 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 $$\sqrt{s} = 13$$ smore »= 13  TeV during LHC Run 2 (2015–2018), corresponding to an integrated luminosity of 139  $$\hbox {fb}^{-1}$$ 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.« less
    Free, publicly-accessible full text available October 1, 2022