Scotogenic A 4 Neutrino Model for Nonzero θ 13 and Large δ CP Ernest Ma 1 , Alexander Natale 1 , and Ahmed Rashed 2,3 1 Department of Physics and Astronomy, University of California Riverside 2 Department of Physics and Astronomy, University of Mississippi 3 Department of Physics, Faculty, of Science, Ain Shams University Introduction Abstract Figure 1: The exchange of dark matter in the loop, and our neutral fermions (which are Majorana) produces neutrino mass terms at the one-loop level. Neutrino Mass and A 4 Results Figure 2: CP violating phase versus θ 13 for various neutrino mass hierarchies Acknowledgements References