The simplest 3-3-1 model

Abstract

A simple extension of the Standard Model (SM), based on the gauge group $SU(3{)}_C\otimes SU(3{)}_L\otimes U(1{)}_Y$ with $Y$ being the hypercharge, is considered. We show that, by imposing an approximate global $SU(2{)}_L\times SU(2{)}_R$ custodial symmetry at the SM energy scale, the $Z-Z^{\prime }$ mixing is absent at tree level and the value of the $\rho$ parameter can be kept close to one. Tree-level flavor-changing neutral currents are also reduced to three particles, namely $Z^{\prime }$, a CP-odd Higgs and a CP-even Higgs. The model predicts new leptons with electric charges of $\pm 1/2e$ and new quarks with $\pm 1/6e$ charges as well as new gauge and scalar bosons with $\pm 1/2e$ charges. Electric charge conservation requires that one of them must be stable. Their masses are unfortunately free parameters.

Comments: 14 pages. matches published version