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

0551958 - FZÚ 2022 RIV DE eng J - Journal Article
Aad, G. - Abbott, B. - Abbott, D.C. - Chudoba, Jiří - Hejbal, Jiří - Hladík, Ondřej - Jačka, Petr - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Latoňová, Věra - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2935 authors
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. Roč. 81, č. 10 (2021), č. článku 860. ISSN 1434-6044. E-ISSN 1434-6052
R&D Projects: GA MŠMT(CZ) LTT17018
Research Infrastructure: CERN-CZ II - 90104
Institutional support: RVO:68378271
Keywords : ATLAS * CERN LHC Coll * pseudoscalar * mediation
OECD category: Particles and field physics
Impact factor: 4.994, year: 2021
Method of publishing: Open access

This paper presents a search for dark matter in the context of a two-Higgs-doublet model together with an additional pseudoscalar mediator, aaa, which decays into the dark-matter particles. Processes where the pseudoscalar mediator is produced in association with a single top quark in the 2HDM+aaa 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=13sqrt{s} = 13s ​=13 TeV during LHC Run2 (2015-2018), corresponding to an integrated luminosity of 139 fb−1^{-1}−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.
Permanent Link: http://hdl.handle.net/11104/0327156