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

Abstract

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. Constraints on neutrino mixing imply an upper bound on the mass of the T-odd mirror leptons at the reach of the LHC and/or future colliders.

20 pages, 4 figures, references added

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• The $\rho$ parameter and $H^0\to {\ell }_i{\ell }_j$ in models with TeV sterile neutrinos
• Probing a new decay of vector-like top partner mediated by heavy Majorana neutrino via single production
• Lepton flavor violation within the Simplest Little Higgs model
• Probing vector-like top partner from same-sign dilepton events at the LHC