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abstract: 'Following the recent results from Daya Bay and RENO, which measure the lepton mixing angle $\theta^l_{13} \approx 0.15$, we revisit a supersymmetric (SUSY) $S_4 \times SU(5)$ model, which predicts tri-bimaximal (TB) mixing in the neutrino sector with $\theta_{13}^l$ being too small in its original version. We show that introducing one additional $S_4$ singlet flavon into the model gives rise to a sizable $\theta^l_{13}$ via an operator which leads to the breaking of one of the two $Z_2$ symmetries preserved in the neutrino sector at leading order (LO). The results of the original model for fermion masses, quark mixing and the solar mixing angle are maintained to good precision. The atmospheric and solar mixing angle deviations from TB mixing are subject to simple sum rule bounds.'
author:
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    Claudia Hagedorn[^1]$\;\;^a$, Stephen F. King[^2]$\;\;^b$, Christoph Luhn[^3]$\;\;^c$\
    $^a$ *Dipartimento di Fisica e Astronomia ‘G. Galilei’, Università di Padova*\
    *INFN, Sezione di Padova,*\
    *Via Marzolo 8, I-35131 Padua, Italy*\
    $^b$ *School of Physics and Astronomy, University of Southampton,*\
    *Southampton, SO17 1BJ, United Kingdom*\
    $^c$ *Institute for Particle Physics Phenomenology, University of Durham,*\
    *Durham, DH1 3LE, United Kingdom*
title: |
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    **SUSY $\bs{S_4 \times SU(5)}$ revisited** 
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Introduction
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Global 