Speaker
Description
A search for dark matter production in association with a Higgs boson
decaying to $b$-quarks is performed using $pp$ collisions at a centre-of-mass
energy of $\sqrt{s}=13\,\mathrm{TeV}$. The dataset has an integrated
luminosity of $80\:\mathrm{fb^{-1}}$and was recorded with the ATLAS
detector at the Large Hadron Collider. Selected collision events comprise
large missing transverse momentum and either two $b$-tagged small
radius jets or a single large radius jet containing two $b$-tagged
subjets. The identification of these subjects is based on a jet algorithm
where the radius parameter is shrinked as the transverse momentum
increases. The results are interpreted in the context of a simplified
model ($Z'$-2HDM) which describes the interaction of dark matter
and standard model particles via new heavy mediator particles. Also
model independent limits on the fiducial cross-section for Higgs +
missing transverse momentum production are provided.
