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

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...

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Hauptverfasser: Agapopoulou, C, Allport, P.P, Ambroz, L, An, F, Ayoub, M.K, Bakker, P.J, Barkeloo, J, Baroncelli, A, Beau, T, Behera, A, Bellagamba, L, Bellos, P, Bhattacharya, D.S, Blocker, C, Bobbink, G.J, Brau, J.E, Cantero, J, Cerri, A, Chen, X, Cheung, K, Cranmer, K, De Santo, A, Demontigny, G, Dittus, F, Emeliyanov, D, Faraj, M, Farbin, A, Fassouliotis, D, Filipčič, A, Fleck, I, Foo, J.H, Formica, A, Franconi, L, Freundlich, E.M, Gallardo, G.E, Gessinger-Befurt, P, Gessner, G, Giannini, A, Gillberg, D, Glazov, A, Gorbounov, P.A, Grout, Z.J, Heinrich, L, Hiller, K.H, Honig, J.C, Hyrych, S, Jeanneau, F, Kirchmeier, D, Kishimoto, T, Kostyukhin, V.V, Kourlitis, E, Kuwertz, E.S, Kuze, M, Lin, K, Linck, R.A, Liu, B, Maslennikov, A.L, Mermod, P, Mincer, A.I, Mkrtchyan, T, Martinez, J.L.M, Muškinja, M, Naumann, T, Nitsche, I, Nurse, E, Palni, P, Hernandez, D.P, Pataraia, S, Pater, J.R, Petit, E, Rassloff, D.F, Richter, S, Rizzi, C, Sanderswood, I.G, Sawada, R, Schioppa, E.J, Schwarz, T.A, Søgaard, A, Soualah, R, South, D, Stavropoulos, G, Strom, D.M, Strubig, A, Tarem, S, Tasevsky, M, Terron, J, Tikhomirov, V.O, Tovey, D.R, Turchikhin, S, Vilucchi, E, Vogel, M, Vozak, M, Walker, S.D, Yallup, D.P, Yan, Z, Yue, X, Zhou, N, Zimmermann, S, Živković, L, Zobernig, G
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Sprache:eng
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Zusammenfassung: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.
DOI:10.1140/epjc/s10052-021-09566-y