PoS - Proceedings of Science
Volume 449 - The European Physical Society Conference on High Energy Physics (EPS-HEP2023) - T04 Neutrino Physics
Neutrino masses and unitarity violation from higher SU(2) representations
J. Herrero-García, S. Marciano*, D. Meloni and D. Vatsyayan
Full text: pdf
Pre-published on: January 29, 2024
Published on: March 21, 2024
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
DOI: https://doi.org/10.22323/1.449.0165
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