Speaker
Description
The 4-lepton final state is a clean and important signal that is being studied at the ATLAS detector. In this study, we focus on four leptons originated from the $R\rightarrow SH\rightarrow 4\ell+E^{miss}_{T}$ signal. $R$ is a scalar boson produced via gluon--gluon fusion and decays to two lighter scalar bosons, $S$ and $H$. The $S$ decays to a pair of Standard Model of particle physics neutrinos. And thereof considered here as missing transverse energy, $E^{miss}_{T}$. The 4-lepton final state comes from the $H$ boson through the decay of the $ZZ$ bosons. The signal region looks at four leptons invariant mass, $m_{4\ell}$, greater than 200 GeV. This study helps to understand the nature of the considered background for the $4\ell+E^{miss}_{T}$ signal on a control region defined by $m_{4\ell}$(140-200) GeV. A comparison between the state-of-the-art Monte Carlo simulation for the background processes, and the data at an integrated luminosity of 139 fb$^{-1}$ is provided.
