Inverse see-saw neutrino masses in the Littlest Higgs model with T-parity
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AuthorÁguila Giménez, Francisco Del; Illana Calero, José Ignacio; Pérez Poyatos, José María; Santiago Pérez, José
Beyond Standard ModelNeutrino physics
del Aguila, F., Illana, J. I., Perez-Poyatos, J. M., & Santiago, J. (2019). Inverse see-saw neutrino masses in the Littlest Higgs model with T-parity. Journal of High Energy Physics, 2019(12), 1-21.
SponsorshipThis work has been supported in part by the Ministry of Science, Innovation and Universities, under grant numbers FPA2016-78220-C3-1,2,3-P (fondos FEDER), and by the Junta de Andalucía grants FQM 101 and SOMM17/6104/UGR.
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 avor violating transitions are one-loop nite. 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.