Littlest mu-tau seesaw

Abstract

We propose a $\mu -\tau$ reflection symmetric Littlest Seesaw ($\mu \tau$-LSS) model. In this model the two mass parameters of the LSS model are fixed to be in a special ratio by symmetry, so that the resulting neutrino mass matrix in the flavour basis (after the seesaw mechanism has been applied) satisfies $\mu -\tau$ reflection symmetry and has only one free adjustable parameter, namely an overall free mass scale. However the physical low energy predictions of the neutrino masses and lepton mixing angles and CP phases are subject to renormalisation group (RG) corrections, which introduces further parameters. Although the high energy model is rather complicated, involving $(S_4\times U(1){)}^2$ and supersymmetry, with many flavons and driving fields, the low energy neutrino mass matrix has ultimate simplicity.

26 pages, 1 figure, discussions and references added, accepted for publication in JHEP

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Cited by in corpus (13)

• Flavor structures of charged fermions and massive neutrinos
• Twin Modular $S_4$ with $SU(5)$ GUT
• The minimal seesaw and leptogenesis models
• The $\mu$-$\tau$ reflection symmetry of Majorana neutrinos
• The symmetry approach to quark and lepton masses and mixing
• Flavoured leptogenesis and ${\mathrm{CP}}^{\mu \tau }$ symmetry
• Nonstandard neutrino interactions and mu-tau reflection symmetry
• $\mu -\tau$ Reflection Symmetry and Its Explicit Breaking for Leptogenesis in a Minimal Seesaw Model
• Effective alignments and the landscape of $S_4$ flavour models
• Simiplified textures of the seesaw model for the trimaximal neutrino mixings
• The translational $\mu$-$\tau$ reflection symmetry of Majorana neutrinos
• Modular flavored dark matter
• Leptogenesis in the $\mu \tau$ basis