Off-shell Higgs signal strength measurement in the high-mass ZZ final states with the ATLAS detector

Measurements of the ZZ final states in the mass range above the 2mZ thresholds provide a unique opportunity to measure the off-shell coupling strength of the Higgs boson. By correlating the measurement of the off-shell signal strength with the signal strength measurement on peak, the total width of the Higgs boson can be constrained indirectly. The measurements of the off-shell Higgs couplings in Higgs decay channels ZZ $\to $ 4l and ZZ $\to $ 2l2$\nu $ will be presented. The results are based on the data collected with the ATLAS experiment in proton-proton collisions at 13 TeV during the 2015 and 2016 data taking period, corresponding to an integrated luminosity of 36.1 fb$-$1.