A search for dark matter produced in association with a dark Higgs boson decaying into a Higgs boson pair in 3$b$ or 4$b$ final states using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

ATLAS Collaboration

A search is performed for dark matter particles produced in association with a resonant pair of Higgs bosons using 140 fb${}^{-1}$ of proton--proton collisions at a centre-of-mass en…