Neutrino masses and unitarity violation from higher SU(2) representations

Authors:
Open Access
Publisher website
Google Scholar
Abstract
The Weinberg operator is the unique dimension-5 operator that generates Majorana masses for neutrinos after electroweak symmetry breaking. Thus, it seems natural that the way to have small neutrino masses is that they are Majorana particles, with their masses obtained at tree level suppressed by a heavy scale, i.e. the seesaw mechanism. We consider new dimension-5 operators with additional scalars that transform under higher representations R under SU(2), up to R ≤ 5. We analyse the constraints on the VEVs of the new scalar multiplets from the 𝜌 parameter, as well as the generation of dimension-6 operators and non-unitarity constraints

This publication has 1 reference indexed in Scilit: