Impact of Missing Transverse Energy Significance in ATLAS analyses in Run2

Missing transverse momentum, MET, 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 missing transverse momentum originates from weakly interacting particles, from those in which MET is consistent with contributions coming from particle measurement, resolutions and inefficiencies. On an event-by-event basis, S evaluates the p-value that the observed MET is consistent with the null hypothesis of zero real MET, given the full event composition. A high value of S is an indication that the MET observed in the event is not well explained by resolution smearing alone, implying that the event is more likely to contain unseen objects such as neutrinos or more exotic weakly interacting particles. A new definition of an object-based missing transverse momentum significance variable is presented. Its performance is studied in Z→ee and ZZ→eeνν events. Finally, the impact of the object-based MET Significance is presented for three different analysis: 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 MET. Search for direct chargino pair production with W-boson mediated decays in events with two leptons and MET