Search for Standard Model Production of Four Top Quarks With Same-Sign and Multilepton Final States in Proton–proton Collisions at √s=13tev

A search for standard model production of four top quarks (t t ¯ t t ¯) is reported using events containing at least three leptons (e , μ) or a same-sign lepton pair. The events are produced in proton–proton collisions at a center-of-mass energy of 13TeV at the LHC, and the data sample, recorded in