Search for direct top squark pair production in final states with two leptons in s√=13 TeV pp collisions with the ATLAS detector

Abstract

The results of a search for direct pair production of top squarks in events with two opposite-charge leptons (electrons or muons) are reported, using 36.1 fb−1 of integrated luminosity from proton--proton collisions at s√=13 TeV collected by the ATLAS detector at the Large Hadron Collider. To cover a range of mass differences between the top squark t̃ and lighter supersymmetric particles, four possible decay modes of the top squark are targeted with dedicated selections: the decay t̃→bχ̃±1 into a b-quark and the lightest chargino with χ̃±1→Wχ̃01, the decay t̃→tχ̃01 into an on-shell top quark and the lightest neutralino, the three-body decay t̃→bWχ̃01 and the four-body decay t̃→bℓνχ̃01. No significant excess of events is observed above the Standard Model background for any selection, and limits on top squarks are set as a function of the t̃ and χ̃01 masses. The results exclude at 95% confidence level t̃ masses up to about 720 GeV, extending the exclusion region of supersymmetric parameter space covered by previous searches.