Decays Z,Z′→ggg,ggγ in the minimal 3‐3‐1 model

A complete calculation at one‐loop level for the gggV, ggγV (V=Z,Z′) couplings is presented in the context of the minimal 3‐3‐1 model, wich predicts the existence of a new Z′ gauge boson and new exotic quarks. Bose symmetry is exploited to write a compact and manifest SUC(3)‐invariant vertex function for the gggV coupling. Previous results on the Z→ggg,ggγ are reproduced. It is found that these decays are insensitive to the effects of new exotic quarks. This in contrast with the Z′→ggg,ggγ decays, specially the last case where the exotic quarks contribution dominates.