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Start date: 2010End date: 2019Author: search.filters.author.Aad, GeorgesSubject: search.filters.subject.Hadron-hadron Scattering (experiments)Subject: search.filters.subject.Beyond Standard ModelSubject: search.filters.subject.Dark Matter

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    PublicationOpen Access
    Search for dark matter in events with a hadronically decaying vector boson and missing transverse momentum in pp collisions at √s=13 TeV with the ATLAS detector
    (Springer Verlag, 2018) Aaboud, M.; Aad, Georges; Abbott, Brad K.; Abdinov, O. B.; Abeloos, Baptiste; Abhayasinghe, D. K.; Abidi, Syed Hani; AbouZeid, O. S.; Abraham, Nicola L.; Abramowicz, Halina; Aaboud, M., National Energy Center of Nuclear Science and Technology, Rabat, Morocco; Aad, Georges, Johannes Gutenberg-Universität Mainz, Mainz, Germany; Abbott, Brad K., The Ohio State University, Columbus, United States; Abdinov, O. B., Azerbaijan National Academy of Sciences, Baku, Azerbaijan; Abeloos, Baptiste, Joint Laboratory of Optics, Olomouc, Czech Republic; Abhayasinghe, D. K., Department of Experimental Particle Physics, Univerza v Ljubljani, Ljubljana, Slovenia; Abidi, Syed Hani, Graduate School of Science and Technology, Tokyo Metropolitan University, Hachioji, Japan; AbouZeid, O. S., Université Clermont Auvergne, Clermont-Ferrand, France; Abraham, Nicola L., SLAC National Accelerator Laboratory, Menlo Park, United States; Abramowicz, Halina, Elevter Andronikashvili Institute of Physics, Tbilisi, Georgia
    A search for dark matter (DM) particles produced in association with a hadronically decaying vector boson is performed using pp collision data at a centre-of-mass energy of s=13 TeV corresponding to an integrated luminosity of 36.1 fb−1, recorded by the ATLAS detector at the Large Hadron Collider. This analysis improves on previous searches for processes with hadronic decays of W and Z bosons in association with large missing transverse momentum (mono-W/Z searches) due to the larger dataset and further optimization of the event selection and signal region definitions. In addition to the mono-W/Z search, the as yet unexplored hypothesis of a new vector boson Z′ produced in association with dark matter is considered (mono-Z′ search). No significant excess over the Standard Model prediction is observed. The results of the mono-W/Z search are interpreted in terms of limits on invisible Higgs boson decays into dark matter particles, constraints on the parameter space of the simplified vector-mediator model and generic upper limits on the visible cross sections for W/Z+DM production. The results of the mono-Z′ search are shown in the framework of several simplified-model scenarios involving DM production in association with the Z′ boson.[Figure not available: see fulltext.]. © 2025 Elsevier B.V., All rights reserved.
  • No Thumbnail Available
    PublicationOpen Access
    Search for large missing transverse momentum in association with one top-quark in proton-proton collisions at √s = 13 TeV with the ATLAS detector
    (Springer Verlag, 2019) Aaboud, M.; Aad, Georges; Abbott, Brad K.; Abdinov, O. B.; Abeloos, Baptiste; Abhayasinghe, D. K.; Abidi, Syed Hani; AbouZeid, O. S.; Abraham, Nicola L.; Abramowicz, Halina; Aaboud, M., National Energy Center of Nuclear Science and Technology, Rabat, Morocco; Aad, Georges, Johannes Gutenberg-Universität Mainz, Mainz, Germany; Abbott, Brad K., The Ohio State University, Columbus, United States; Abdinov, O. B., Azerbaijan National Academy of Sciences, Baku, Azerbaijan; Abeloos, Baptiste, Joint Laboratory of Optics, Olomouc, Czech Republic; Abhayasinghe, D. K., Department of Experimental Particle Physics, Univerza v Ljubljani, Ljubljana, Slovenia; Abidi, Syed Hani, Graduate School of Science and Technology, Tokyo Metropolitan University, Hachioji, Japan; AbouZeid, O. S., Université Clermont Auvergne, Clermont-Ferrand, France; Abraham, Nicola L., SLAC National Accelerator Laboratory, Menlo Park, United States; Abramowicz, Halina, Elevter Andronikashvili Institute of Physics, Tbilisi, Georgia
    This 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.[Figure not available: see fulltext.]. © 2025 Elsevier B.V., All rights reserved.