Testing Higgs $CP$ properties at the CEPC with an additional ISR parameter
We evaluate the experimental sensitivity to the $CP$-odd admixture in the standard Higgs boson for the process $e^+e^-\to HZ$. The analysis is performed assuming the future lepton collider CEPC reference detector operating at $\sqrt{s}=240~\text{GeV}$ with statistics of $5.6~\text{ab}^{-1}$. Using the WHIZARD generator with the Higgs Characterisation model and the DELPHES detector simulation framework we obtain data samples for different $CP$-odd Higgs admixture parameters $\tilde{c}_{ZZ}$. The initial state radiation effects are taken into account in WHIZARD. We develop a novel data-analysis method that exploits the ISR-induced shift in the reconstructed event energy $E_{\text{RECO}}$ as an additional source of information on the Higgs $CP$ structure. The method combines the ISR-sensitive event-energy information with three angular observables in a multidimensional likelihood analysis. The expected upper limit on the CP-odd Higgs admixture is improved by 15% compared with the standard analysis based on three angular variables.