Threshold effects on renormalization group running of neutrino parameters in the low-scale seesaw model

TL;DR

This paper investigates how renormalization group effects and threshold corrections in the low-scale seesaw model can significantly alter neutrino mixing angles, enabling flavor symmetries to be consistent with experimental data.

Contribution

It provides analytical formulas for radiative corrections across seesaw thresholds and demonstrates the potential for flavor symmetric mixing patterns to be compatible with low-energy neutrino data.

Findings

Seesaw threshold effects can enhance RG running of neutrino parameters.

Flavor symmetric mixing patterns can be realized at low energy scales.

Analytical formulas for radiative corrections are derived.

Abstract

We show that, in the low-scale type-I seesaw model, renormalization group running of neutrino parameters may lead to significant modifications of the leptonic mixing angles in view of so-called seesaw threshold effects. Especially, we derive analytical formulas for radiative corrections to neutrino parameters in crossing the different seesaw thresholds, and show that there may exist enhancement factors efficiently boosting the renormalization group running of the leptonic mixing angles. We find that, as a result of the seesaw threshold corrections to the leptonic mixing angles, various flavor symmetric mixing patterns (e.g., bi-maximal and tri-bimaximal mixing patterns) can be easily accommodated at relatively low energy scales, which is well within the reach of running and forthcoming experiments (e.g., the LHC).