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T: Fachverband Teilchenphysik

T 10: Dunkle Materie und Kollider I

T 10.3: Vortrag

Montag, 25. März 2019, 16:30–16:45, S09

Search for Dark Matter in the Mono-Higgs Channel with the ATLAS Detector — •Andrea Matic and Jeanette Lorenz — Ludwig-Maximilians-Universität München

From astrophysical observations it is known that a large fraction of the mass-energy density in the universe consists of Dark Matter (DM). However, the particle nature of DM is unknown. Promising candidates for DM are weakly interacting massive particles (WIMPs). Apart from the gravitational force, these hypothetical particles only interact weakly. WIMPs could be produced in proton-proton collisions at the Large Hadron Collider (LHC). As they would not interact with the detector material, such collision events can be characterized by high missing transverse momentum.

A search for DM with the ATLAS detector at a center-of-mass energy of 13 TeV will be presented. The search is sensitive to the pair production of DM particles in association with a Higgs boson, which decays further into two b-quarks. This decay can have two different signatures in the detector: For low momenta of the Higgs boson the b-quarks hadronize into two small-radius jets, while for high momenta they are collimated into one large-radius jet.

In this talk the search strategy will be presented with emphasis on expected improvements of the analysis, which relate to the treatment of the bb-system and modifications to the fitting procedure for signal and background.