Leptophobic character of the Z′ in an SU(3)C ⊗ SU(3)L ⊗ U(1)X model

We show that the extra Z boson predicted within the so- called “3-3-1” model has a leptophobic character, and analyse its effects on Z decay widths and on the tt production cross section in pp collisions at the Fermilab Tevatron. Recent model-independent analysis are applied in order to estimate the contribution of this Z′ to the observables that will be measured at LEP2.