Seesaw Models with Minimal Flavor Violation
Xiao-Gang He1,2,3, Chao-Jung Lee3, Jusak Tandean3, Ya-Juan Zheng3*
1INPAC, SKLPPC, and Department of Physics, Shanghai Jiao Tong University, Shanghai, China
2Physics Division, National Center for Theoretical Sciences, Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
3CTS, CASTS, and Department of Physics, National Taiwan University, Taipei, Taiwan
* presenting author:Ya-Juan Zheng,
We explore realizations of minimal flavor violation (MFV) for leptons in the simplest seesaw models where the neutrino mass generation mechanism is driven by new fermion singlets (type I) or triplets (type III) and by a scalar triplet (type II). To study the phenomenological implications, we consider a number of effective dimension-six operators that are purely leptonic or couple leptons to the standard-model gauge and Higgs bosons and evaluate constraints on the scale of MFV associated with these operators from the latest experimental information. Specifically, we employ the most recent measurements of neutrino mixing parameters as well as the currently available data on flavor-violating radiative and three-body decays of charged leptons, μ → e conversion in nuclei, the anomalous magnetic moments of charged leptons, and their electric dipole moments. With our numerical results, we illustrate some striking differences among the seesaw types.

Keywords: minimal flavor violation, seesaw models, flavor violating process