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One-loop matching of the type-II seesaw model onto the Standard Model effective field theory.
- Source :
- Journal of High Energy Physics; Apr2022, Vol. 2022 Issue 4, p1-38, 38p
- Publication Year :
- 2022
-
Abstract
- In this paper, we continue to construct the low-energy effective field theories (EFTs) of the canonical seesaw models, which are natural extensions of the Standard Model (SM) to accommodate tiny but nonzero neutrino masses. Different from three right-handed neutrino singlets in the type-I seesaw model, the Higgs triplet in the type-II seesaw model participates directly in the electroweak gauge interactions, rendering the EFT construction more challenging. By integrating out the heavy Higgs triplet in the functional-integral formalism, we carry out a complete one-loop matching of the type-II seesaw model onto the so-called Standard Model Effective Field Theory (SMEFT). It turns out that 41 dimension-six operators (barring flavor structures and Hermitian conjugates) in the Warsaw basis of the SMEFT can be obtained, covering all those 31 dimension-six operators in the case of type-I seesaw model. The Wilson coefficients for 41 dimension-six operators are computed up to O M ∆ − 2 with M<subscript>∆</subscript> being the mass scale of the Higgs triplet. Moreover, the branching ratios of rare radiative decays of charged leptons l α − → l β − + γ are calculated in the EFT and compared with that in the full theory in order to demonstrate the practical application and the correctness of our EFT construction. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 11266708
- Volume :
- 2022
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Journal of High Energy Physics
- Publication Type :
- Academic Journal
- Accession number :
- 156929228
- Full Text :
- https://doi.org/10.1007/JHEP04(2022)038