  We present an analysis of new physics searches in $Z\,h$ with missing energy
final states at the Large Hadron Collider considering $Z \to l^+ l^-$ (where
$l^\pm = e^\pm, \mu^\pm$) and $h \to b\bar b$ decay modes. For this analysis we
consider production of a $CP$-odd scalar $A$ through gluon-fusion which decay
into a heavy $CP$-even neutral scalar $H$ with $Z$-boson. Further $H$ decays
into a lighter $CP$-even Higgs boson $h$ in association with dark matter
candidate $\chi$ - a source of missing energy. The masses of these scalars are
considered as $m_h = 125$ GeV, $m_\chi = 60$ GeV, $2 m_h < m_H < 2 m_t$ and
$m_A > 2 m_t$. A data-driven method have been applied to reduce the
considerable backgrounds from electroweak processes $W$+ jets and $Z$+ jets, in
addition with top-pair and single-top production. The di-jet mass distributions
have been studied with same- and opposite-flavour lepton selections.
