The ATLAS collaboration (Including: Becker, K., Facini, Gabriel, Harrison, P. F., Jones, E., Martin, T. A., McNicol, Christopher John, Murray, W.J., Spangenberg, Martin and Xia, Ligang). (2021) Search for dark matter produced in association with a single top quark in s√=13 TeV pp collisions with the ATLAS detector. European Physical Journal C, 81 (10). 860. doi:10.1140/epjc/s10052-021-09566-y

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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.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Quarks, Particles (Nuclear physics), Higgs bosons, Nuclear physics
Journal or Publication Title:	European Physical Journal C
Publisher:	Springer
ISSN:	1434-6044
Official Date:	1 October 2021
Dates:	Date Event 1 October 2021 Published 23 August 2021 Accepted
Volume:	81
Number:	10
Article Number:	860
DOI:	10.1140/epjc/s10052-021-09566-y
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access
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http://dx.doi.org/10.13039/501100001809 UNSPECIFIED [NRC] National Research Council Canada http://dx.doi.org/10.13039/501100000046 UNSPECIFIED [CFI] Canada Foundation for Innovation http://dx.doi.org/10.13039/501100000196 UNSPECIFIED Agencia Nacional de Investigación y Desarrollo UNSPECIFIED UNSPECIFIED [CAS] Chinese Academy of Sciences http://dx.doi.org/10.13039/501100002367 UNSPECIFIED Ministry of Science and Technology of the People's Republic of China http://dx.doi.org/10.13039/501100002855 UNSPECIFIED [NSFC] National Natural Science Foundation of China http://dx.doi.org/10.13039/501100001809 UNSPECIFIED Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS) http://dx.doi.org/10.13039/100007637 UNSPECIFIED Ministerstvo školství, mládeže a tĕlovýchovy UNSPECIFIED UNSPECIFIED Ministerstvo průmyslu a obchodu UNSPECIFIED UNSPECIFIED Danmarks Grundforskningsfond http://dx.doi.org/10.13039/501100001732 UNSPECIFIED Statens naturvidenskabelige forskningsråd 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