Littlest mu-tau seesaw

• Published in: The journal of high energy physics Vol. 2019; no. 5; pp. 1 - 24
• Main Authors: King, Stephen F., Zhou, Ye-Ling
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.05.2019; Springer Nature B.V; SpringerOpen
• Subjects: Classical and Quantum Gravitation; Discrete Symmetries; Elementary Particles; High energy physics; Leptons; Mass matrix; Mathematical models; Matrix methods; Neutrino Physics; Neutrinos; Parameters; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Reflection; Regular Article - Theoretical Physics; Relativity Theory; Renormalization Group; Solar and Atmospheric Neutrinos; String Theory; Supersymmetry; Symmetry; Discrete Symmetries; Renormalization Group; Neutrino Physics; Solar and Atmospheric Neutrinos
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP05(2019)217

A bstract We propose a μ − τ reflection symmetric Littlest Seesaw ( μτ -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 μ − τ 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 × U(1)) 2 and supersymmetry, with many flavons and driving fields, the low energy neutrino mass matrix has ultimate simplicity.