Search for pairs of scalar leptoquarks decaying into quarks and electrons or muons in s√ = 13 TeV pp collisions with the ATLAS detector

Abstract

A search for new-physics resonances decaying into a lepton and a jet performed by the ATLAS experiment is presented. Scalar leptoquarks pair-produced in pp collisions at p s = 13TeV at the Large Hadron Collider are considered using an integrated luminosity of 139 fb-1, corresponding to the full Run 2 dataset. They are searched for in events with two electrons or two muons and two or more jets, including jets identi ed as arising from the fragmentation of c- or b-quarks. The observed yield in each channel is consistent with the Standard Model background expectation. Leptoquarks with masses below 1.8TeV and 1.7TeV are excluded in the electron and muon channels, respectively, assuming a branching ratio into a charged lepton and a quark of 100%, with minimal dependence on the quark avour. Upper limits on the aforementioned branching ratio are also given as a function of the leptoquark mass.