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The production of dark matter in association with Higgs bosons is predictedin several extensions of the Standard Model. An exploration of such scenariosis presented, considering final states with missing transverse momentum and$b$-tagged jets consistent with a Higgs boson. The analysis uses proton-protoncollision data at a centre-of-mass energy of 13 TeV recorded by the ATLASexperiment at the LHC during Run 2, amounting to an integrated luminosity of139 fb$^{-1}$. The analysis, when compared with previous searches, benefitsfrom a larger dataset, but also has further improvements providing sensitivityto a wider spectrum of signal scenarios. These improvements include both anoptimised event selection and advances in the object identification, such asthe use of the likelihood-based significance of the missing transverse momentumand variable-radius track-jets. No significant deviation from Standard Modelexpectations is observed. Limits are set, at 95% confidence level, in twobenchmark models with two Higgs doublets extended by either a heavy vectorboson $Z'$ or a pseudoscalar singlet $a$ and which both provide a dark mattercandidate $\chi$. In the case of the two-Higgs-doublet model with an additionalvector boson $Z'$, the observed limits extend up to a $Z'$ mass of 3 TeV for amass of 100 GeV for the dark matter candidate. The two-Higgs-doublet model witha dark matter particle mass of 10 GeV and an additional pseudoscalar $a$ isexcluded for masses of the $a$ up to 520 GeV and 240 GeV for $\tan \beta = 1$and $\tan \beta = 10$ respectively. Limits on the visible cross-sections areset and range from 0.05 fb to 3.26 fb, depending on the missing transversemomentum and $b$-quark jet multiplicity requirements.

the journal of high energy physics/the journal of high energy physics

Search for dark matter produced in association with a Standard Model  Higgs boson decaying into $b$-quarks using the full Run 2 dataset from the  ATLAS detector