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T: Fachverband Teilchenphysik

T 93: Search for new particles V

T 93.3: Vortrag

Freitag, 3. April 2020, 11:30–11:45, H-HS IV

Search for Dark Matter in the Mono-H(bb) Channel — •Andrea Matic and Jeanette Lorenz — Ludwig-Maximilians-Universität München

Astrophysical and cosmological measurements indicate that about 27% of the energy density in the universe consist 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. This 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 well separated jets, while for high momenta they are merged into a single jet.

In this talk the search strategy will be presented as well as the improvements which have been introduced in light of the analysis with the full Run II dataset.