Abstract
In the context of the type-I seesaw mechanism, it is known that θ 13 is zero and leptogenesis can not be realized if there exists a residual flavor symmetry resulting in the Tri-Bimaximal neutrino mixing pattern. We propose a simple framework where additional particles, odd under a Z 2 symmetry, break the residual flavor symmetry and the lightest of the Z 2 odd particles is the dark matter candidate. As as result, nonzero θ 13, δ CP , leptogenesis and the correct dark matter density can be accommodated. On the other hand, a Z 2 odd scalar can play the role of the inflaton with mass of 1013 GeV motivated by the recent BICEP2 results. Interestingly, the model can “generate” δ CP ≃ −π/2, preferred by the T2K experiment in the normal hierarchy neutrino mass spectrum.
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Huang, WC. The dark side of θ 13, δ CP , leptogenesis and inflation in type-I seesaw. J. High Energ. Phys. 2014, 83 (2014). https://doi.org/10.1007/JHEP11(2014)083
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DOI: https://doi.org/10.1007/JHEP11(2014)083