New fermions and a vector-like third generation in $SU(3{)}_c\otimes SU(3{)}_L\otimes U(1{)}_N$ models

Abstract

We study two 3-3-1 models with i) five (four) charge 2/3 ($-1/3$) quarks and, ii) four (five) charge 2/3 ($-1/3$) quarks and a vector-like third generation. Possibilities beyond these models are also briefly considered.

Comments: 32 pages, Revtex 3.0, no figures