Speaker
Description
With the current precision of measurements by ATLAS and CMS experiments, it cannot be excluded that a SM-like Higgs boson is a CP violating mixture of CP-even and CP-odd states. We explore this possibility here, assuming Higgs boson production in ZZ-fusion, at 1 TeV ILC, with unpolarized beams. The full reconstruction of SM background and fast reconstruction of the signal is performed, simulating 8 ab$^{-1}$ of data collected with the ILD detector. We demonstrate that the CP mixing angle $\Psi_{\mathrm{CP}}$ between scalar and pseudoscalar states can be measured with the statistical uncertainty of 4 mrad at 68% CL, corresponding to 1.6 $\cdot$ 10$^{-5}$ for the CP parameter $f_{CP}$. This is the first result on sensitivity of an $e^+e^-$ collider to measure $f_{CP}$ in vector boson fusion.
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