2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/118996High-energy unitarity is satisfied by adding a sextet quark doublet to QCD. The sextet sector produces electroweak symmetry breaking and is predicted to give large cross-section effects at the LHC. It embeds, uniquely, in a massless SU(5) theory whose bound-state S-Matrix, potentially, reproduces the Standard Model. Infra-red chirality transitions of the massless Dirac sea play an essential dynamical role.Contribution to the Proceedings of HSQCD 2005 (recently requested)High Energy Physics - Phenomenologytext