Probing C P V mixing in the Higgs sector in vector boson fusion at a 1 TeV ILC

Le résumé fourni par la source

With the current precision of measurements by the ATLAS and CMS experiments, it cannot be excluded that a standard model (SM)-like Higgs boson is a C P violating mixture of C P -even and C P -odd states. We explore this possibility here, assuming Higgs boson production in ZZ-fusion, at 1 TeV ILC, with unpolarized beams. The full simulation of SM background and fast simulation of the signal is performed, simulating 8 ab − 1 of data collected with the ILD detector. We demonstrate that the C P mixing angle Ψ C P between scalar and pseudoscalar states can be measured with the statistical uncertainty of 3.8 mrad at 68% CL, corresponding to 1.44 × 10 − 5 for the C P parameter f C P , for the pure scalar state. This is the first result on sensitivity of an e + e − collider to measure f C P in the Higgs production vertex in vector boson fusion. Published by the American Physical Society 2024

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