SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 4: Searches I

T 4.3: Vortrag

Montag, 20. März 2023, 17:00–17:15, HSZ/0403

Search for Dark Matter in association with a single top quark at the CMS experiment — •Sebastian Wieland, Ulrich Husemann, and Michael Waßmer — Institute of Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT)

A promising production mechanism of Dark Matter at the Large Hadron Collider (LHC) is the associated production with a single top quark. Since the Dark Matter particles are not directly detected by the CMS detector the final state consists of a single top quark and missing transverse momentum, referred to as mono-top signature. Based on the decay channel of the top quark, two analyses are performed and presented. In the case of a hadronic top quark decay, large-radius jets are utlized, where multivariate techniques are applied to distinguish these jets from purely QCD-initiated jets. In the analysis, targeting the leptonic decay of the top quark, the transverse W boson mass is utilized to discriminate between the mono-top signal and the standard-model backgrounds. The analysis utilizes the full Run-2 dataset collected by the CMS experiment at the LHC. All results of this search are interpreted in the context of a simplified model introducing a flavor-changing neutral current at tree level by a spin-1 mediator and a Dirac Dark Matter particle.