# Sensitivity study of anomalous HZZ couplings at future Higgs factory

## TL;DR

This paper assesses how precisely future Higgs factories can measure anomalous HZZ couplings, especially CP violation, using effective theory and collider data, to test the Standard Model and explore new physics.

## Contribution

It provides the first detailed sensitivity analysis for model-independent HZZ couplings at future Higgs factories, including CP violation parameters, using realistic collider parameters.

## Key findings

- Very small sensitivity limits for CP violation parameter $ ilde g$
- Constraints derived from Higgsstrahlung cross section and angular distributions
- Potential to detect new physics signals beyond the Standard Model

## Abstract

We study the sensitivity of constraining the model independent Higgs-Z-Z coupling under effective theory up to dimension-6 operators at the future Higgs factory. Utilizing the current conceptual design parameters of the Circular Electron Positron Collider, we give the experimental limits for the model independent operators by the total Higgsstrahlung cross section and angular distribution of Z boson decay in the Higgs factory. Especially, we give very small sensitivity limit for the CP violation parameter $\tilde g$, which will be a clear window to test the Standard Model and look for New Physics signal.