SU(2)_F bosons in a U(2)_F flavor model induce unsuppressed flavor-violating couplings, with K to pi X and mu to e X constraining the breaking scale v_phi to 10^11-10^12 GeV for light bosons and other processes constraining heavier states.
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Multiple vector-like fermions in SU(5) GUT raise the unification scale to about 10^15.5 GeV, suppress proton decay operators via multiplet admixtures, and relax rigid Yukawa relations to better match observed fermion masses.
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Phenomenology of Non-Abelian Gauge and Goldstone Bosons in a U(2) Flavor Model
SU(2)_F bosons in a U(2)_F flavor model induce unsuppressed flavor-violating couplings, with K to pi X and mu to e X constraining the breaking scale v_phi to 10^11-10^12 GeV for light bosons and other processes constraining heavier states.
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Fermion Multiplicities at the GUT Scale: A Statistical Study of Unification and Proton Decay
Multiple vector-like fermions in SU(5) GUT raise the unification scale to about 10^15.5 GeV, suppress proton decay operators via multiplet admixtures, and relax rigid Yukawa relations to better match observed fermion masses.