Saved in:
| Main Authors: | , |
|---|---|
| Format: | Preprint |
| Published: |
2026
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2602.12326 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866910020902322176 |
|---|---|
| author | Flores-Hernandez, Mario Martin, Adam |
| author_facet | Flores-Hernandez, Mario Martin, Adam |
| contents | We study the decays $h \to \ell \bar{\ell} \left(Z \to \ell' \bar{\ell'}\right)$ and $h\to\ell\barν_\ellν_{\ell'}\bar{\ell'}$ within the SMEFT framework and including effects up to $\mathcal O(1/Λ^4)$, where $Λ$ is the new physics scale suppressing higher dimensional operators. To work to this order, we must include the square of dimension-six operators and the interference of dimension-eight operators with the Standard Model. We study angular asymmetries and other differential decay observables and determine which are most sensitive to $\mathcal O(1/Λ^4)$ effects. While new kinematic structures arising in higher dimensional operators have the potential to induce novel angular dependency, we find this does not occur for $h\to\ell\bar{\ell}\left(Z\xrightarrow{}\ell'\bar{\ell'}\right)$. For $h \to \ell \barν_\ell ν_{\ell'} \bar{\ell'}$, new angular dependencies do arise at $\mathcal O(1/Λ^4)$, though they require a fully reconstructible (meaning we can go to the Higgs rest frame) final state. For non-reconstructible final states such as $\ell \barν_\ell ν_{\ell'} \bar{\ell'}$, we must study Higgs production and decay together with the appropriate observables, which we find obscures the new angular effects. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_12326 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Higgs decays to four leptons to $\mathcal{O}(1/Λ^4)$ in SMEFT Flores-Hernandez, Mario Martin, Adam High Energy Physics - Phenomenology We study the decays $h \to \ell \bar{\ell} \left(Z \to \ell' \bar{\ell'}\right)$ and $h\to\ell\barν_\ellν_{\ell'}\bar{\ell'}$ within the SMEFT framework and including effects up to $\mathcal O(1/Λ^4)$, where $Λ$ is the new physics scale suppressing higher dimensional operators. To work to this order, we must include the square of dimension-six operators and the interference of dimension-eight operators with the Standard Model. We study angular asymmetries and other differential decay observables and determine which are most sensitive to $\mathcal O(1/Λ^4)$ effects. While new kinematic structures arising in higher dimensional operators have the potential to induce novel angular dependency, we find this does not occur for $h\to\ell\bar{\ell}\left(Z\xrightarrow{}\ell'\bar{\ell'}\right)$. For $h \to \ell \barν_\ell ν_{\ell'} \bar{\ell'}$, new angular dependencies do arise at $\mathcal O(1/Λ^4)$, though they require a fully reconstructible (meaning we can go to the Higgs rest frame) final state. For non-reconstructible final states such as $\ell \barν_\ell ν_{\ell'} \bar{\ell'}$, we must study Higgs production and decay together with the appropriate observables, which we find obscures the new angular effects. |
| title | Higgs decays to four leptons to $\mathcal{O}(1/Λ^4)$ in SMEFT |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2602.12326 |