Data driven method for predicting the shape of the dijet mass in $Zh+{E_{\mathrm{T}}}^{\mathrm{miss}}$ analysis

Abstract

We present an analysis of new physics searches in $Zh$ with missing energy final states at the Large Hadron Collider considering $Z\to l^{+}{l}^{-}$ (where $l^{\pm }=e^{\pm },\hat{I}{¼}^{\pm }$) 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 $\ddot{I}‡$ - a source of missing energy. The masses of these scalars are considered as $m_h=125$ GeV, $m_{\ddot{I}}‡=60$ GeV, $2m_h<m_H<2m_t$ and $m_A>2m_t$. 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.

6 pages, 3 figures, 2 tables, SAIP2016 conference proceedings, University of Cape Town, Cape Town