Renormalization group evolution of neutrino masses and mixing in the Type-III seesaw mechanism

Understand

We consider the standard model extended by heavy right handed fermions transforming as triplets under SU(2)$_L$, which generate neutrino masses through the Type-III seesaw mechanism.

• At energies below their respective mass scales, the heavy fields get sequentially decoupled to give an effective dimension-5 operator.
• Above their mass thresholds, these fields also participate in the renormalization of the wavefunctions, masses and coupling constants.
• We compute the renormalization group evolution of the effective neutrino mass matrix in this model, with particular emphasis on the threshold effects.