Impact of missing transverse momentum significance in ATLAS analyses at run 2

Missing transverse momentum, $E$$^{miss}_{T}$, is commonly used to study the production of weakly interacting particles. The missing transverse momentum significance, $S$, helps to separate events in which the reconstructed $E$$^{miss}_{T}$ originates from weakly interacting particles, from those in which $E$$^{miss}_{T}$ is consistent with contributions coming from particle measurement, resolutions and inefficiencies. A new definition of an object-based missing transverse momentum significance variable is presented and its performance is studied in $Z$ → $ee$ and $ZZ$ → $eeνν$ events. Finally, the impact of the $S$ varaible is presented for two physics analyses using Run 2 data: Search for dark matter in association with a Higgs decaying into b-quarks Search for bottom squark production in final states containing Higgs bosons, $b$-jets and $E$$^{miss}_{T}$ and the search for direct chargino pair production with W-boson mediated decays in events with two leptons and $E$$^{miss}_{T}$.