Constraints on off-shell Higgs boson production and the Higgs boson total width in ZZ → 4ℓ and ZZ → 2ℓ2ν final states with the ATLAS detector

A measurement of off-shell Higgs boson production in the Z Z → 4 ℓ and Z Z → 2 ℓ 2 ν decay channels, where ℓ stands for either an electron or a muon, is performed using data from proton–proton collisions at a centre-of-mass energy of s = 13 TeV. The data were collected by the ATLAS experiment in 201