Çetin, Serkant Ali2021-01-072021-01-072019-05-071029-8479https://hdl.handle.net/11411/3056https://doi.org/10.1007/JHEP05(2019)041This paper describes a search for events with one top-quark and large missing transverse momentum in the final state. Data collected during 2015 and 2016 by the ATLAS experiment from 13 TeV proton-proton collisions at the LHC corresponding to an integrated luminosity of 36.1 fb(-1) are used. Two channels are considered, depending on the leptonic or the hadronic decays of the W boson from the top quark. The obtained results are interpreted in the context of simplified models for dark-matter production and for the single production of a vector-like T quark. In the absence of significant deviations from the Standard Model background expectation, 95% confidence-level upper limits on the corresponding production cross-sections are obtained and these limits are translated into constraints on the parameter space of the models considered.eninfo:eu-repo/semantics/openAccessBeyond Standard ModelDark matterFCNC InteractionHadron-Hadron scattering (experiments)vector-like quarksArticle2-s2.0-8506578924110.1007/JHEP05(2019)041Q1WOS:000467622100001