Search for high-mass new phenomena in the dilepton final state using proton–proton collisions at √s=13 TeVwith the ATLAS detector

Abstract

A search is conducted for both resonant and non-resonant high-mass new phenomena in dielectron and dimuon final states. The search uses 3.2 fb−1of proton–proton collision data, collected at √s=13 TeVby the ATLAS experiment at the LHC in 2015. The dilepton invariant mass is used as the discriminating variable. No significant deviation from the Standard Model prediction is observed; therefore limits are set on the signal model parameters of interest at 95% credibility level. Upper limits are set on the cross-section times branching ratio for resonances decaying to dileptons, and the limits are converted into lower limits on the resonance mass, ranging between 2.74TeVand 3.36TeV, depending on the model. Lower limits on the qqcontact interaction scale are set between 16.7TeV and 25.2TeV, also depending on the model.