Measurement of Higgs decay to WW$^{*}$ in Higgsstrahlung at $\sqrt{s}=500$ GeV ILC and in WW-fusion at $\sqrt{s}=3$ TeV CLIC

This talk presents results of the two independent analyses evaluating the measurement accuracy of the branching ratio for the Standard model Higgs boson decay to a W-pair, at the Compact Linear Collider (CLIC) and at the International Linear Collider (ILC). The considered Higgs production channels are the WW-fusion for the highest energy stage of CLIC, $\sqrt{s}=3$ TeV, and the Higgsstrahlung process for the nominal ILC energy, $\sqrt{s}=500$ GeV. Both studies are performed using the full simulation of the detector. The realistic experimental conditions have been simulated including beam energy spectrum, initial state radiation and the background from $\gamma \gamma \rightarrow hadrons$ processes, which are overlaid on simulated events. The multivariate analysis technique is used for the final event selection and the expected relative statistical uncertainty, $\Delta ( \sigma \cdot BR)/(\sigma \cdot BR)$, of the measured Higgs production cross sections is estimated.