Abstract
We obtain a phenomenologically acceptable PMNS matrix in a flipped SU(5) model, possessing the Z4R discrete symmetry, from the compactification of heterotic string E8×E8′. To analyze the Jarlskog determinant efficiently, we include the simple Kim-Seo form for the Pontecorbo-Maki-Nakagawa-Sakata matrix. We also noted that |δPMNS|≲63o for the normal hierarchy of neutrino masses with the PDG book parametrization.
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