Neutrinos in the Simplest Little Higgs Model

TL;DR

This paper explores neutrino properties within the simplest little Higgs model, revealing how neutrino masses and mixings arise through loop corrections and vector-like leptons in a model based on SU(3) symmetry.

Contribution

It introduces a detailed analysis of neutrino mass generation and mixing mechanisms in the simplest little Higgs model with SU(3) symmetry, including loop-induced Majorana masses.

Findings

Neutrino masses are generated at one-loop level.

Mixing occurs between SM neutrinos and heavy neutral leptons.

The model predicts specific neutrino flavor mixing patterns.

Abstract

The simplest little Higgs model based on a SU(3) global symmetry contains a $SU(3)_{weak}$ triplet and a singlet per a generation in the lepton sector. A neutral component of the triplet and the singlet turn into a neutral vector-like $SU(2)_L$ singlet after electroweak symmetry breaking while the other neutral component of the triplet is the SM neutrino. At tree level, Yukawa couplings of the lepton sector not only allow the neutral vector-like lepton to couple to the SM neutrino, but also give them a Dirac mass. Majorana mass terms for the SM neutrinos and their partners arise at one loops, leading to neutrino flavor mixing in addition to neutrino-heavy neutral lepton mixing.