Raising the Higgs mass with Yukawa couplings for isotriplets in vector-like extensions of minimal supersymmetry

Understand

Extra vector-like matter with both electroweak-singlet masses and large Yukawa couplings can significantly raise the lightest Higgs boson mass in supersymmetry through radiative corrections.

• I consider models of this type that involve a large Yukawa coupling between weak isotriplet and isodoublet chiral supermultiplets.
• The particle content can be completed to provide perturbative gauge coupling unification, in several different ways.
• The impact on precision electroweak observables is shown to be acceptably small, even if the new particles are as light as the current experimental bounds of order 100 GeV.