ICHEP 2022

Jul 6 – 13, 2022
Bologna, Italy
Europe/Rome timezone

Complete one-loop matching of the type-I seesaw model onto the Standard Model effective field theory

Jul 8, 2022, 7:05 PM
1h 25m
Bologna, Italy

Bologna, Italy

Palazzo della Cultura e dei Congressi
Poster Neutrino Physics

Speaker

Di Zhang (Institute of High Energy Physics, CAS)

Description

In this paper, we accomplish the complete one-loop matching of the type-I seesaw model onto the Standard Model Effective Field Theory (SMEFT), by integrating out three heavy Majorana neutrinos with the functional approach. It turns out that only 31 dimensionsix operators (barring flavor structures and Hermitian conjugates) in the Warsaw basis of the SMEFT can be obtained, and most of them appear at the one-loop level. The Wilson coefficients of these 31 dimension-six operators are computed up to $\mathcal{O}(M^{-2})$ with $M$ being the mass scale of heavy Majorana neutrinos. As the effects of heavy Majorana neutrinos are encoded in the Wilson coefficients of these higher-dimensional operators, a complete one-loop matching is useful to explore the low-energy phenomenological consequences of the type-I seesaw model. In addition, the threshold corrections to the couplings in the Standard Model and to the coefficient of the dimension-five operator are also discussed. The one-loop matching results of the type-II seesaw model are also briefly discussed.

Based on
- D. Zhang and S. Zhou, Complete one-loop matching of the type-I seesaw model onto the Standard Model effective field theory, JHEP 09 (2021), 163 [arXiv:2107.12133 [hep-ph]].
- X. Li, D.Zhang and S.Zhou, One-loop Matching of the Type-II Seesaw Model onto the Standard Model Effective Field Theory,[arXiv:2201.05082 [hep-ph]].

In-person participation No

Primary authors

Di Zhang (Institute of High Energy Physics, CAS) Prof. Shun Zhou