Eur. Phys. J. C (2006) 46: 497-509
https://doi.org/10.1140/epjc/s2006-02513-y

Theoretical Physics

Phenomenology of the model with right-handed neutrinos

¹ Instituto de Física, Universidad de Antioquia, A.A. 1226, Medellín, Colombia
² Escuela de Física, Universidad Nacional de Colombia, A.A. 3840, Medellín, Colombia

^* e-mail: lasanche@unalmed.edu.co

Received: 12 October 2005
Revised: 21 November 2005
Published online: 24 March 2006

Abstract

A phenomenological analysis of the three-family model based on the local gauge group with right-handed neutrinos is carried out. Instead of using the minimal scalar sector able to break the symmetry in a proper way, we introduce an alternative set of four Higgs scalar triplets, which combined with an anomaly-free discrete symmetry, produces a quark mass spectrum without hierarchies in the Yukawa coupling constants. We also embed the structure into a simple gauge group and show some conditions for achieving a low energy gauge coupling unification, avoiding possible conflict with proton decay bounds. By using experimental results from the CERN-LEP, SLAC linear collider, and atomic parity violation data, we update constraints on several parameters of the model.