Interference effects on Higgs mass measurement in $e^{+}{e}^{-}\to H(\gamma \gamma )Z$ at CEPC

Abstract

A high luminosity Circular Electron Positron Collider (CEPC) as a Higgs Factory will be helpful to the precision measurement of the Higgs mass. The signal-background interference effect is carefully studied for the Higgs diphoton decay mode in the associated Z boson production at the future $e^{+}{e}^{-}$ colliders at energy $246\mathrm{GeV}$. The mass shifts go up from about $20\mathrm{MeV}$ to $50\mathrm{MeV}$ for the experimental mass resolution ranging from $0.8\mathrm{GeV}$ to $2\mathrm{GeV}$.

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• Charged lepton flavor violating Higgs decays at future $e^{+}{e}^{-}$ colliders