Speaker
Description
Summary
In this short talk, the quark-lepton charge relations which have motivated the research are presented. The hypotheses of electroweak quark-lepton symmetry and weak topological-charge confinement that account for the observed symmetry are stated. The approach, which adds to the Standard Model the new hidden states of prequarks and preleptons and the associated presymmetry, is described. In particular, the problem of gauge anomaly is addressed. Motivations to go beyond the Standard Model by duplicating in a symmetric way the particle spectrum are next given. The prime motivation is to generate a residual presymmetry in the sense of Ekstein, so avoiding the use against the model of the Occam’s razor principle. In fact, presymmetry is difficult to test or refute at the level of the Standard Model. Constraints from high precision experiments provide only restrictions on the mass of the new particles. The upper bounds below 1 TeV for fermions partners raise expectations of their direct detection. The talk ends with conclusions based on results. [Refs.: E.A. Matute, Mod. Phys. Lett. A (2009), to be published; Int. J. Mod. Phys. A22, 3669 (2007); Phys. Rev. D73, 055008 (2006).]
