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We present an analysis of new physics searches in $Z\,h$ with missing energyfinal 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 weconsider production of a $CP$-odd scalar $A$ through gluon-fusion which decayinto a heavy $CP$-even neutral scalar $H$ with $Z$-boson. Further $H$ decaysinto a lighter $CP$-even Higgs boson $h$ in association with dark mattercandidate $\chi$ - a source of missing energy. The masses of these scalars areconsidered 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 theconsiderable backgrounds from electroweak processes $W$+ jets and $Z$+ jets, inaddition with top-pair and single-top production. The di-jet mass distributionshave been studied with same- and opposite-flavour lepton selections.

Data driven method for predicting the shape of the dijet mass in $Z\,h + {E_{\rm T}}^{\rm {miss}}$ analysis