The mass bounds on exotic particles in an SU(3)(L) x U(1)(X) model

We study an SU(3)(L) X U(1)(X) electroweak model. By requiring M-Z1(2) - M- W(2)/ cos(2)theta (W) to be less than experimental value we obtain a lower bound on Z' boson mass, Mz(') > 600 GeV. The relation between M-Z' and M-U (M-V) then gives a lower bound on M-U (M-V) : M-U (M-V) > 490 GeV. From the constraint sin(2) theta (W) (M-Z') < 0.3, the upper bounds on M-Z' and M-U (M-V) are computed to be M-Z' < 5.8 x 10(4) TeV and M-U (M-V) < 4.6 X 10(4 ) TeV. We estimate further the K-L - K-S mass difference due to Z' exchange and try to use the result to obtain stronger lower bounds. On cosmological grounds we find that M-N < 390 eV for T-f = 2.3 GeV and M-N < 740 eV for T -f = 300 GeV.