Measurement of the CPV Higgs mixing angle in ZZ-fusion at 1 TeV ILC

TL;DR

This paper explores the potential to measure the CP-violating mixing angle in the Higgs sector at a future 1 TeV linear collider, focusing on ZZ-fusion production to improve understanding of Higgs CP properties.

Contribution

It proposes a method to measure the Higgs CP-violating mixing angle at a 1 TeV linear collider using ZZ-fusion, addressing current experimental limitations.

Findings

Feasibility of measuring CP violation in Higgs sector at 1 TeV collider

Potential sensitivity to small CP-odd contributions

Method to distinguish scalar and pseudoscalar states

Abstract

Although the studies of tensor structure of the Higgs boson interactions with vector bosons and fermions at CMS and ATLAS experiments have established that the $J^{\mathrm{PC}}$ quantum numbers of the Higgs boson should be $0^{++}$, small CP violation in the Higgs sector (up to 10% contribution of the CP-odd state) cannot be excluded with the current experimental precision. We review possibilities to measure CP violating mixing angle $\Psi_{\mathrm{CP}}$ between scalar and pseudoscalar states, at a linear electron-positron collider, at center-of-mass energy of 1 TeV.