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We study μ–e conversion with sequential four generations. A large mass for the fourth generation neutrino can enhance the conversion rate by orders of magnitude. We compare constraints obtained from μ–e conversion using experimental bounds on various nuclei with those from μ→eγ and μ→ee¯e. We find that the current bound from μ–e conversion with Au puts the most stringent constraint in this model....
We propose a supersymmetric SU(5)′×SU(5)″ model, where the quarks and leptons live in a U(1) product group theory space that is compactified on the real projective plane RP2. The fermion generations are placed on different points in the deconstructed manifold by assigning them SO(10) compatible U(1) charges. The observed masses and mixing angles of quarks and leptons emerge from non-renormalizable...
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