Search for Dark Matter produced in association with a Higgs boson decaying to 𝒃-quarks using the ATLAS detector

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 $b\bar{b}$ pair originating from a Higgs boson decay. For this purpose proton-proton collision data is used which is produced at 13 TeV center-of-mass energy and recorded by the ATLAS experiment at the LHC, amounting to an integrated luminosity of $139\, \mathrm{fb}^{-1}$. The increase in integrated luminosity in conjunction with several 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 Two-Higgs-Doublet models with an additional vector or pseudoscalar mediator.