Abstract
We discuss gauge models incorporating μ-τ flavored CP symmetry (called CPμτ in the text) in combination with L μ − L τ invariance to understand neutrino mixings and discuss their phenomenological implications. We show that viable leptogenesis in this setting requires that the lightest right-handed neutrino mass must be between 109-1012 GeV and for effective two hierarchical right-handed neutrinos, leptogenesis takes place only in a narrower range of 5 × 1010-1012 GeV. A multi-Higgs realization of this idea implies that there must be a pseudoscalar Higgs boson with mass less than 300 GeV. Generically, the vev alignment problem can be naturally avoided in our setting.
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Mohapatra, R., Nishi, C. Implications of μ-τ flavored CP symmetry of leptons. J. High Energ. Phys. 2015, 92 (2015). https://doi.org/10.1007/JHEP08(2015)092
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DOI: https://doi.org/10.1007/JHEP08(2015)092