Many extensions of the Standard Model predict the production of Dark Matter in association with Higgs bosons.
This search examines the final state of missing transverse momentum
accompanied by a bb pair coming from a Higgs boson decay. For this purpose proton-proton
collision data is used which is produced at 13 TeV centre-of-mass energy and recorded by the
ATLAS experiment at the LHC, amounting to an integrated luminosity of 139 fb−1.
The increase in integrated luminosity in conjunction with many analysis optimizations result in
a better sensitivity in comparison to previous iterations. No significant deviation from the
Standard Model is observed and the results are interpreted in the context of the 2-Higgs
doublet models with an additional vector or pseudoscalar mediator.