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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2407.18185 |
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| _version_ | 1866916573411803136 |
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| author | Degrassi, Giuseppe Slavich, Pietro |
| author_facet | Degrassi, Giuseppe Slavich, Pietro |
| contents | We compute the two-loop BSM contributions to the $h\longrightarrow γγ$ decay width in the SM extended with a real triplet of $SU(2)$. We consider scenarios in which the neutral components of doublet and triplet do not mix, so that the lighter neutral scalar $h$ has (at least approximately) SM-like couplings to fermions and gauge bosons. We focus on the two-loop corrections controlled by the quartic scalar couplings, and obtain explicit and compact formulas for the $h γγ$ amplitude by means of a low-energy theorem that connects it to the derivative of the photon self-energy w.r.t. the Higgs field. We briefly discuss the numerical impact of the newly-computed contributions, showing that they may be required for a precise determination of $Γ[h\rightarrow γγ]$ in scenarios where the quartic scalar couplings are large. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_18185 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | On the two-loop BSM corrections to $h\longrightarrow γγ$ in a triplet extension of the SM Degrassi, Giuseppe Slavich, Pietro High Energy Physics - Phenomenology We compute the two-loop BSM contributions to the $h\longrightarrow γγ$ decay width in the SM extended with a real triplet of $SU(2)$. We consider scenarios in which the neutral components of doublet and triplet do not mix, so that the lighter neutral scalar $h$ has (at least approximately) SM-like couplings to fermions and gauge bosons. We focus on the two-loop corrections controlled by the quartic scalar couplings, and obtain explicit and compact formulas for the $h γγ$ amplitude by means of a low-energy theorem that connects it to the derivative of the photon self-energy w.r.t. the Higgs field. We briefly discuss the numerical impact of the newly-computed contributions, showing that they may be required for a precise determination of $Γ[h\rightarrow γγ]$ in scenarios where the quartic scalar couplings are large. |
| title | On the two-loop BSM corrections to $h\longrightarrow γγ$ in a triplet extension of the SM |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2407.18185 |