Abstract
We survey the scalar electroweak multiplets that can originate from a grand unified theory (GUT) like SU(5), SO(10) or E6. We compute the oblique parameters S, T and U for a general scalar electroweak multiplet and then apply the results to the leptoquark, as well as the color sextet and octet cases, allowed by the GUT survey. Constraints from precision measurement data of the Standard Model W boson mass and ρ parameter to the mass splittings within each of these multiplets are presented. Extension to general vector electroweak multiplets is briefly discussed.
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