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We study some phenomenological constraints on the parameters of a left rightmodel with mirror fermions (LRMM) that solves the strong CP problem. Inparticular, we evaluate the contribution of mirror neutrinos to the invisible Zdecay width (\Gamma_Z^{inv}), and we find that the present experimental valueon \Gamma_Z^{inv}, can be used to place an upper bound on the Z-Z' mixing anglethat is consistent with limits obtained previously from other low-energyobservables. In this model the charged fermions that correspond to the standardmodel (SM) mix with its mirror counterparts. This mixing, simultaneously withthe Z-Z' one, leads to modifications of the \Gamma(Z --> f \bar{f}) decaywidth. By comparing with LEP data, we obtain bounds on the standard-mirrorlepton mixing angles. We also find that the bottom quark mixing parameters canbe chosen to fit the experimental values of R_b, and the resulting values forthe Z-Z' mixing angle do not agree with previous bounds. However, thisdisagreement disappears if one takes the more recent ALEPH data.Comment: 7 pages, 2 figures, REVTe

Constraints on the parameters of the left-right mirror model