Where are the next Higgs bosons?

Simple symmetry arguments applied to the third generation lead to a prediction: there exist new sequential Higgs doublets with masses of order <5.5TeV, with approximately universal Higgs-Yukawa coupling constants, g~1. This is calibrated by the known Higgs boson mass, the top quark Higgs-Yukawa coupling, and the b-quark mass. A new massive weak-isodoublet, Hb, coupled to the b-quark with g~1 is predicted. It may be accessible at the 13 TeV LHC, and definitively at an energy upgraded 26 TeV LHC. The extension to leptons generates a new Hτ and a possible Hντ doublet. The accessibility of the latter depends upon whether the mass of the τ-neutrino is Dirac or Majorana. The new physics of the model is technically natural, and overall the model is no less natural than the Standard Model. [ABSTRACT FROM AUTHOR]