  In the MSSM extended by a complete vectorlike family, precise top, bottom and
tau Yukawa coupling unification can be achieved assuming SUSY threshold
corrections which are typical for comparable superpartner masses. Furthermore,
the unification is possible with a large unified coupling, implying that all
three fermion masses can be simultaneously close to their IR fixed points.
Assuming unified Yukawa couplings of order one or larger, the preferred common
scale of new physics (superpartners and vectorlike matter) is in the 3 TeV to
30 TeV range, with larger couplings favoring smaller scales. Splitting
superpartner masses from masses of vectorlike fields, the preferred scales
extend in both directions. The multi-TeV scale for superpartners is compatible
with and independently suggested by the Higgs boson mass.
