We calculate the spinor helicity amplitudes of anomalous $Hto ZZ to 4ell$ decay. After embedding these analytic formulas into the $texttt{MCFM}$ package, we study the interference effects between the anomalous $ggto Hto ZZ to 4ell$ process and the SM processes, which are indispensable in the Higgs off-shell region. Subsequently, the constraints on the anomalous couplings are estimated using LHC experimental data.
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