On the two-loop BSM corrections to $$h\longrightarrow \gamma \gamma $$ h ⟶ γ γ in a triplet extension of the SM
Abstract We compute the two-loop BSM contributions to the $$h\longrightarrow \gamma \gamma $$ h ⟶ γ γ 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 lea...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2025-01-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-025-13758-1 |
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| Summary: | Abstract We compute the two-loop BSM contributions to the $$h\longrightarrow \gamma \gamma $$ h ⟶ γ γ 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 $$h \gamma \gamma $$ h γ γ 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 $$\Gamma [h\rightarrow \gamma \gamma ]$$ Γ [ h → γ γ ] in scenarios where the quartic scalar couplings are large. |
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| ISSN: | 1434-6052 |