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T: Fachverband Teilchenphysik

T 76: Search for Dark Matter 3

T 76.4: Vortrag

Mittwoch, 23. März 2022, 17:00–17:15, T-H35

Search for dark matter produced in association with two top quarks and missing energy in the final state using ATLAS 13 TeV pp collision data — •Marco Rimoldi — DESY, Hamburg, Germany

The hypothesis of the existence of non-baryonic dark matter (DM) comes from gravitational evidence across a wide range of astrophysical and cosmological systems. Of the many types of DM candidate proposed, weakly interacting massive particles (WIMP) are believed to be a theoretically convincing candidate. WIMPs must interact weakly with electromagnetic radiation and be consistent with the expected DM density. If WIMPs are the manifestation in nature of DM, then it may be possible to produce it directly at the LHC.

Results of the combination of four analyses are presented, selecting final state events with two top quarks and invisible particles. Proton proton collisions data collected by the ATLAS experiment at a centre-of-mass energy of 13 TeV during the Run-2 data-taking are used. Results are interpreted in terms of dark matter simplified models considering a spin-0 mediator to dark sector.

Upper limits on the Higgs boson invisible branching ratio, where the Higgs is produced according to the Standard Model in association with a pair of top quarks are also reported.