Measuring the ratio of HW W and HZZ couplings through W + W ? H production
Journal
Journal of High Energy Physics
Journal Volume
2018
Journal Issue
8
Date Issued
2018
Author(s)
Abstract
A bstract 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 λ W 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 λ W Z .
Type
journal article