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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2511.06353 |
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| _version_ | 1866908639147589632 |
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| author | Drutskoy, Alexey Vasenin, Egor |
| author_facet | Drutskoy, Alexey Vasenin, Egor |
| contents | 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 (ISR) effects are taken into account in WHIZARD. Angular and ISR energy shift variables are used to distinguish the $CP$-odd and $CP$-even Higgs components. The upper limit on the $CP$-odd Higgs admixture is improved by 20\% with this method compared to the standard analysis with three angular variables. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_06353 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Testing Higgs $CP$ properties at the CEPC with an additional ISR parameter Drutskoy, Alexey Vasenin, Egor High Energy Physics - Phenomenology High Energy Physics - Experiment 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 (ISR) effects are taken into account in WHIZARD. Angular and ISR energy shift variables are used to distinguish the $CP$-odd and $CP$-even Higgs components. The upper limit on the $CP$-odd Higgs admixture is improved by 20\% with this method compared to the standard analysis with three angular variables. |
| title | Testing Higgs $CP$ properties at the CEPC with an additional ISR parameter |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2511.06353 |