70 citations · 875 across the 30 of their papers we have counts for
5 papers · 1 filter
Roots of unity and lepton mixing patterns from finite flavour symmetries
R. M. Fonseca, W. Grimus
The classification of lepton mixing matrices from finite residual symmetries is reviewed, with emphasis on the role of vanishing sums of roots of unity for the solution of this pro…
Consistency of the triplet seesaw model revisited
Cesar Bonilla, Renato M. Fonseca, José W. F. Valle
Adding a scalar triplet to the Standard Model is one of the simplest ways of giving mass to neutrinos, providing at the same time a mechanism to stabilize the theory's vacuum. In t…
Vacuum stability with spontaneous violation of lepton number
Cesar Bonilla, Renato M. Fonseca, José W. F. Valle
The vacuum of the Standard Model is known to be unstable for the measured values of the top and Higgs masses. Here we show how vacuum stability can be achieved naturally if lepton…
SU(5)-inspired double beta decay
Renato M. Fonseca, Martin Hirsch
The short-range part of the neutrinoless double beta amplitude is generated via the exchange of exotic particles, such as charged scalars, leptoquarks and/or diquarks. In order to…
On the chirality of the SM and the fermion content of GUTs
Renato M. Fonseca
The Standard Model (SM) is a chiral theory, where right- and left-handed fermion fields transform differently under the gauge group. Extra fermions, if they do exist, need to be he…