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A measurement of off-shell Higgs boson production in the $ZZ\to4\ell$ and$ZZ\to2\ell2\nu$ decay channels, where $\ell$ stands for either an electron ora muon, is performed using data from proton-proton collisions at acentre-of-mass energy of $\sqrt{s}=13$ TeV. The data were collected by theATLAS experiment in 2015 and 2016 at the Large Hadron Collider, and theycorrespond to an integrated luminosity of 36.1 fb$^{-1}$. An observed(expected) upper limit on the off-shell Higgs signal strength, defined as theevent yield normalised to the Standard Model prediction, of 3.8 (3.4) isobtained at 95% confidence level (CL). Assuming the ratio of the Higgs bosoncouplings to the Standard Model predictions is independent of the momentumtransfer of the Higgs production mechanism considered in the analysis, acombination with the on-shell signal-strength measurements yields an observed(expected) 95% CL upper limit on the Higgs boson total width of 14.4 (15.2)MeV.

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Constraints on off-shell Higgs boson production and the Higgs boson  total width in $ZZ\to4\ell$ and $ZZ\to2\ell2\nu$ final states with the ATLAS  detector