Abstract
For a generic Higgs boson, measuring the relative sign and magnitude of its couplings with the W and Z bosons is essential in determining its origin. Such a test is also indispensable for the 125-GeV Higgs boson. We propose that the ratio of the HW W and HZZ couplings λW Z can be directly determined through the W+W−H production, where H denotes a generic Higgs boson, owing to the tree-level interference effect. While this is impractical at the LHC due to the limited sensitivity, it can be done at future e+e− colliders, such as a 500-GeV ILC with the beam polarization P (e−, e+) = (−0.8, +0.3) in the jjℓ±bb and ℓ±ℓ±ℓ∓jj channels. The discovery potential of a general ratio and the power to discriminate it from the SM value are studied in detail. Combining the cross section of e+e− → W+W−H with the measurements of HZZ coupling at the HL-LHC, one can further improve the sensitivity of λW Z .
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