Inverse see-saw neutrino masses in the Littlest Higgs model with T-parity

Understand

We show that the inverse see-saw is the most natural way of implementing neutrino masses in the Littlest Higgs model with T-parity.

• The three extra quasi-Dirac neutrinos are needed to cancel the quadratically divergent contributions of the mirror leptons to the Higgs mass.
• If the T-parity of the heavy neutrino singlets is chosen to be even, their contributions to lepton flavor violating transitions are one-loop finite.
• The most stringent limits on this scenario result from the non-observation of these transitions.