I show that if the structural integers of the Standard Model have no prime factor exceeding 3 (arithmetic admissibility), then the Higgs sector is completely determined. The number of Higgs doublets is exactly one, excluding the minimal supersymmetric standard model. The only admissible representations of SU (2) L for a complex Higgs field are the doublet and the triplet, but no triplets can coexist with the doublet, and a lone triplet is excluded by the electroweak ρ parameter. The proofs use the Goldstone mechanism for electroweak symmetry breaking and elementary modular arithmetic. The same arithmetic obstruction (the prime 5) that excludes two Higgs doublets also excludes SU (5) grand unification and a fourth quark-lepton generation.
Eric Yaw (Thu,) studied this question.
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