Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/103919
Title: Search for dark matter produced in association with a single top quark in √ s = 13 TeV pp collisions with the ATLAS detector
Authors: Fiolhais, M. C. N. 
Gonçalo, R. 
Veloso, F. 
Wolters, H. 
ATLAS Collaboration
Issue Date: Oct-2021
Publisher: Springer Nature
Serial title, monograph or event: European Physical Journal C
Volume: 81
Issue: 10
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 transversemomentum 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.
URI: http://hdl.handle.net/10316/103919
DOI: 10.1140/epjc/s10052-021-09566-y
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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