Signals of extra gauge bosons and exotic leptons in SU(6)$_{L}$ x U(1)$_{Y}$

摘要

We study some of the consequences of the SU(6)_{L}\otimesU(1)_{Y} model of unification of electroweak interactions and families with a horizontal gauge group SU(2)_{H}, paying special attention to processes with flavor changing neutral currents. We compute at tree level the decays K^{+}\longrightarrow \pi^{+}\mu^{+}e^{-}, K_L^0\longrightarrow \mu^{+}e^{-} and \mu^{-} \longrightarrow e^{-} \bar{\nu_e} \nu_\mu from which we obtain lower bounds for the mass of the horizontal gauge boson associated with FCNC. Finally we obtain limits on the mixing between ordinary and exotic charged leptons.