Missing Doublet Multiplet as the Origin of the Doublet-Triplet Splitting in SUSY SU(6)
Abstract
In a SU(6) gauge theory we found the irreducible representation (175-plet) which does not contain the Higgs doublet. Using this representation we construct two SUSY SU(6) models in which the doublet-triplet splitting occurs naturally, without fine tuning. The crucial role is played by the ``custodial" global SU(2)H in combination with discrete or continuous R symmetries.
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