Göttingen 2025 – scientific programme
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T: Fachverband Teilchenphysik
T 66: Searches/BSM IV (BSM with Tops, LQs)
T 66.5: Talk
Thursday, April 3, 2025, 17:15–17:30, ZHG010
Search for dark matter production in association with a single top quark at the CMS experiment — •Moritz Molch1, Doug Berry2, Ulrich Husemann1, Michael Waßmer1, and Sebastian Wieland1 — 1Institute of Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT) — 2Fermi National Accelerator Laboratory (FNAL), Batavia, IL
This talk presents results of a search for the production of dark matter (DM) candidates in association with a single top quark in proton-proton collisions at a center-of-mass energy of √s = 13 TeV with the CMS experiment, with a data set corresponding to an integrated luminosity of 138 fb−1.
Since DM candidates are expected to interact only very weakly, they are not directly detectable with the CMS detector. Therefore the final state consists of a single top quark and missing transverse momentum.
The presented analysis targets the final state in which the top quark decays hadronically. A key feature of this analysis is the use of large-radius jets in combination with multivariate techniques to separate jets which originate from a top quark decay from purely QCD-initiated jets. The major backgrounds are estimated in the maximum likelihood fit for signal extraction using data from multiple control regions. Finally, the results are interpreted in the context of a simplified model introducing a flavor-changing neutral current at tree-level by a spin-1 mediator and spin-1/2 DM candidates.
Keywords: CMS; dark matter; top quark; mono-top