Abstract
The recent discovery of a sizeable reactor angle θ 13 by Daya Bay and RENO has ruled out exact tri-bimaximal (TB) lepton mixing. Recently two of us studied the vacuum alignment of the Altarelli-Feruglio A 4 family symmetry model including additional flavons in the 1′ and 1′′ representations, leading to so-called “trimaximal” neutrino mixing and allowing a potentially large reactor angle. Here we show how such a model may arise from a Supersymmetric (SUSY) Grand Unified Theory (GUT) based on SU(5), leading to sum rule bounds \( \left| s \right| \leqslant \frac{{{\theta_C}}}{3},\left| a \right| \leqslant \frac{1}{2}\left( {r + \frac{{{\theta_C}}}{3}} \right)\left| {\cos \;\delta } \right| \) (these predictions are based upon the assumption of a Georgi-Jarlskog relation), where s, a, r parameterise the solar, atmospheric and reactor angle deviations from their TB mixing values, δ is the CP violating oscillation phase, and θ C is the Cabibbo angle.
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Cooper, I.K., King, S.F. & Luhn, C. A4 × SU(5) SUSY GUT of flavour with trimaximal neutrino mixing. J. High Energ. Phys. 2012, 130 (2012). https://doi.org/10.1007/JHEP06(2012)130
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DOI: https://doi.org/10.1007/JHEP06(2012)130