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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| Format: | Article |
| Language: | English |
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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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| author | Giuseppe Degrassi Pietro Slavich |
| author_facet | Giuseppe Degrassi Pietro Slavich |
| author_sort | Giuseppe Degrassi |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-7e614c19dfd140378bb893d1fba55a2b |
| institution | Kabale University |
| issn | 1434-6052 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj-art-7e614c19dfd140378bb893d1fba55a2b2025-01-26T12:49:15ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522025-01-0185111610.1140/epjc/s10052-025-13758-1On the two-loop BSM corrections to $$h\longrightarrow \gamma \gamma $$ h ⟶ γ γ in a triplet extension of the SMGiuseppe Degrassi0Pietro Slavich1Dipartimento di Matematica e Fisica, Università di Roma Tre, INFN, Sezione di Roma TreSorbonne Université, CNRS, Laboratoire de Physique Théorique et Hautes Energies, LPTHEAbstract 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.https://doi.org/10.1140/epjc/s10052-025-13758-1 |
| spellingShingle | Giuseppe Degrassi Pietro Slavich On the two-loop BSM corrections to $$h\longrightarrow \gamma \gamma $$ h ⟶ γ γ in a triplet extension of the SM European Physical Journal C: Particles and Fields |
| title | On the two-loop BSM corrections to $$h\longrightarrow \gamma \gamma $$ h ⟶ γ γ in a triplet extension of the SM |
| title_full | On the two-loop BSM corrections to $$h\longrightarrow \gamma \gamma $$ h ⟶ γ γ in a triplet extension of the SM |
| title_fullStr | On the two-loop BSM corrections to $$h\longrightarrow \gamma \gamma $$ h ⟶ γ γ in a triplet extension of the SM |
| title_full_unstemmed | On the two-loop BSM corrections to $$h\longrightarrow \gamma \gamma $$ h ⟶ γ γ in a triplet extension of the SM |
| title_short | On the two-loop BSM corrections to $$h\longrightarrow \gamma \gamma $$ h ⟶ γ γ in a triplet extension of the SM |
| title_sort | on the two loop bsm corrections to h longrightarrow gamma gamma h ⟶ γ γ in a triplet extension of the sm |
| url | https://doi.org/10.1140/epjc/s10052-025-13758-1 |
| work_keys_str_mv | AT giuseppedegrassi onthetwoloopbsmcorrectionstohlongrightarrowgammagammahgginatripletextensionofthesm AT pietroslavich onthetwoloopbsmcorrectionstohlongrightarrowgammagammahgginatripletextensionofthesm |