Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 93: Search for new particles V

T 93.4: Talk

Friday, April 3, 2020, 11:45–12:00, H-HS IV

Searching for Dark Matter with the CMS experiment — •Dominic Stafford, Christian Schwanenberger, Alexander Grohsjean, Afiq Anuar, Nicole Stefanov, Samuel Baxter, and Jonas Rübenach — DESY, Hamburg, Germany

Astronomical observations provide strong evidence that a large proportion of the matter in the universe is "Dark Matter" not described in the Standard Model of particle physics. Furthermore, cosmological considerations suggest Dark Matter should couple to the SM on the TeV scale, and hence may be discoverable at the LHC. We present a search for Dark Matter coupling to top quarks via a (pseudo-)scalar mediator in top quark pair production in pp-scattering at 13 TeV. Dark Matter particles would show up as an excess of missing transverse energy. We review the results of a previous search in dilepton final states using 2016 CMS data, and present our current status of the full-Run-2 analysis involving new techniques, such as adding the single top production channel, improvements in Monte Carlo simulations and data-driven modeling of backgrounds, and improvements of machine learning techniques, which may improve sensitivity to these models.