Gauged Lepton Flavour
Abstract
The gauging of the lepton flavour group is considered in the Standard Model context and in its extension with three right-handed neutrinos. The anomaly cancellation conditions lead to a Seesaw mechanism as underlying dynamics for all leptons; requiring in addition a phenomenologically viable setup leads to Majorana masses for the neutral sector: the type I Seesaw Lagrangian in the Standard Model case and the inverse Seesaw in the extended model. Within the minimal extension of the scalar sector, the Yukawa couplings are promoted to scalar fields in the bifundamental of the flavour group. The resulting low-energy Yukawa couplings are proportional to inverse powers of the vacuum expectation values of those scalars; the protection against flavour changing neutral currents differs from that of Minimal Flavor Violation. In all cases, the flavour sector exhibits rich and promising phenomenological signals.
Cite
@article{arxiv.1609.05902,
title = {Gauged Lepton Flavour},
author = {R. Alonso and E. Fernandez Martinez and M. B. Gavela and B. Grinstein and L. Merlo and P. Quilez},
journal= {arXiv preprint arXiv:1609.05902},
year = {2017}
}
Comments
42 pages, 9 figures, 2 tables; revised argument in section 2, results unchanged, references added