Several extensions of the Standard Model predict the production of dark matter particles at the LHC. A pioneering search is performed for dark matter particles produced in association with a Dark Higgs boson $s$ decaying to $VV$ where $V=W^\pm,Z$, using 139~fb$^{-1}$ of $pp$ collisions recorded by the ATLAS detector at a center-of-mass energy of 13~TeV at the LHC. The $s\to V(q\bar q)V(q\bar q)$ decays are reconstructed with a novel technique using reclustered jets with a cone parameter $R=0.8$ based on $R=0.4$ calorimeter jets and tracking information. The observed data are found to agree with Standard Model predictions.

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