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One-loop off-shell decay $H^* \rightarrow ZZ$ at future colliders
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abstract
We present one-loop formulas for contributing to the $HZZ$ vertex in 't Hooft-Veltman gauge within Standard Model framework. One-loop off-shell Higgs decay rates to $Z$-pair are investigated in both unpolarized and longitudinal polarization for $Z$ bosons in final state. The corrections are range of $7\%$ to $8.4\%$ when we vary the off-shell Higgs mass from $200$ GeV to $500$ GeV. In applications, we study off-shell Higgs decay $H^* \rightarrow ZZ$ in the Higgs productions at future colliders such as the signal processes $\gamma^*(Q^2)\gamma \rightarrow H^* \rightarrow ZZ$ and $e^-\gamma \rightarrow e^-H^* \rightarrow e^- ZZ$ are analyzed.
Forward citations
Cited by 2 Pith papers
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New physics in the $ZZh$ vertex: One-loop contributions from a radiative seesaw model
In a radiative-seesaw model, one-loop neutrino exchange produces CP-even ZZh anomalous couplings as large as ~10^-3, while CP-odd couplings stay at ~10^-15.
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$CP$ violation in the $HZZ$ vertex and left-right asymmetries
Flavor-changing Z and Higgs couplings can induce CP-violating HZZ form factors up to about 10^-7, and a new asymmetry in Z* -> Z H is proposed to search for them.
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