Saved in:
| Main Authors: | , |
|---|---|
| Format: | Preprint |
| Published: |
2026
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2604.27471 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866914520124882944 |
|---|---|
| author | Azari, F. Haghighat, M. |
| author_facet | Azari, F. Haghighat, M. |
| contents | We investigate the phenomenology of the Standard Model extended by a real gauge-singlet scalar field, focusing on exotic Higgs decay channels. For a light scalar mass in the range \(0 < m_ϕ < 40\) GeV, the Higgs boson can decay to both two and three scalar final states. We derive analytical expressions for these decay rates and impose a global constraint on the model parameters by requiring that their sum does not exceed the total Standard Model Higgs boson decay width. This requirement translates into a fourth-order inequality with respect to the singlet vacuum expectation value, \(v_ϕ\). We demonstrate that satisfying this inequality imposes an upper bound of \(\cos θ< 0.12 - 0.13\) across the entire mass range, providing a complementary constraint to existing direct search limits. Utilizing stronger independent constraints on the mixing (e.g., \(\cos θ< 0.1\)), we then predict upper bounds on the individual exotic decay rates as a function of \(m_ϕ\) as \(Γ_{h \rightarrow ϕϕ} < 0.06\) MeV and \(Γ_{h \rightarrow ϕϕϕ} < 5 \times 10^{- 6}\) MeV, respectively. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_27471 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Constraints on a Light Singlet Scalar from Combined Exotic Higgs Decays Azari, F. Haghighat, M. High Energy Physics - Phenomenology High Energy Physics - Theory We investigate the phenomenology of the Standard Model extended by a real gauge-singlet scalar field, focusing on exotic Higgs decay channels. For a light scalar mass in the range \(0 < m_ϕ < 40\) GeV, the Higgs boson can decay to both two and three scalar final states. We derive analytical expressions for these decay rates and impose a global constraint on the model parameters by requiring that their sum does not exceed the total Standard Model Higgs boson decay width. This requirement translates into a fourth-order inequality with respect to the singlet vacuum expectation value, \(v_ϕ\). We demonstrate that satisfying this inequality imposes an upper bound of \(\cos θ< 0.12 - 0.13\) across the entire mass range, providing a complementary constraint to existing direct search limits. Utilizing stronger independent constraints on the mixing (e.g., \(\cos θ< 0.1\)), we then predict upper bounds on the individual exotic decay rates as a function of \(m_ϕ\) as \(Γ_{h \rightarrow ϕϕ} < 0.06\) MeV and \(Γ_{h \rightarrow ϕϕϕ} < 5 \times 10^{- 6}\) MeV, respectively. |
| title | Constraints on a Light Singlet Scalar from Combined Exotic Higgs Decays |
| topic | High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2604.27471 |