Speaker
Description
We describe examples of renormalizable field theories where the breaking of chiral symmetry at the UV cutoff leaves behind at low energy dynamically generated elementary particle masses in a way alternative to the Higgs mechanism. In this scenario 1) the scale of the elementary particle masses is set by the RGI scale of the theory 2) masses are kept ``small'' owing to an enhanced chiral symmetry enjoyed by the massless theory, thus solving the 't Hooft naturalness problem, 3) in order to match the experimental value of the top mass, a super-strongly interacting sector, gauge-invariantly coupled to standard matter, needs to exist with an RGI scale, $\Lambda_T\gg\Lambda_{QCD}$, of the order of a few TeV's, 4) the peculiar dependence of the non-perturbatively generated masses upon the gauge couplings is such that it may offer a hint to solve the mass hierarchy problem, 5) $\Lambda_T$ sets the order of magnitude of the electro-weak scale, 6) the 125 GeV resonance recently identified at LHC is interpreted as a $W^+W^-/ZZ$ composite state bound by exchanges of super-strongly interacting particles to which the electro-weak bosons are coupled, 7) at (momenta)$^2 \ll \Lambda_T^2$ the couplings of the composite Higgs boson with quark, leptons and electro-weak bosons coincide with those of the Standard Model up to O($\alpha_W$) corrections, 8) with a reasonable choice of particle content, a theory extending the Standard Model with the inclusion of the new super-strong sector exhibits gauge coupling unification at a scale $\sim 10^{18}$~GeV making the proton life time comfortably larger then the present limit of $1.7 \times 10^{34}$ years.
