Unified Theory of Elementary Particles -- in Search of Extra Dimensions   -----
  Even though the unified theory of electroweak interactions is very successful at low energies, there remains one part to be confirmed. It is the sector involving Higgs particles. Those Higgs particles are expected to be discovered. It has been shown recently that Higgs particles can be viewed as gauge fields in higher dimensional gauge theory. The mass of a Higgs particle and its coupling to other particles are constrained by the gauge principle. In this scenario the mass of a Higgs particle is predicted to be in the range of 120 GeV - 290 GeV, exactly in the range explored at LHC, provided that the extra dimension is curved and warped. Thus physics of extra dimensions can manifest itself in collider experiments at the LHC energies. 
Yutaka Hosotani