Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-05-30
Phys.Rev. D57 (1998) 1934-1939
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 2 figures, REVTeX
Scientific paper
10.1103/PhysRevD.57.1934
We study some phenomenological constraints on the parameters of a left right model with mirror fermions (LRMM) that solves the strong CP problem. In particular, we evaluate the contribution of mirror neutrinos to the invisible Z decay width (\Gamma_Z^{inv}), and we find that the present experimental value on \Gamma_Z^{inv}, can be used to place an upper bound on the Z-Z' mixing angle that is consistent with limits obtained previously from other low-energy observables. In this model the charged fermions that correspond to the standard model (SM) mix with its mirror counterparts. This mixing, simultaneously with the Z-Z' one, leads to modifications of the \Gamma(Z --> f \bar{f}) decay width. By comparing with LEP data, we obtain bounds on the standard-mirror lepton mixing angles. We also find that the bottom quark mixing parameters can be chosen to fit the experimental values of R_b, and the resulting values for the Z-Z' mixing angle do not agree with previous bounds. However, this disagreement disappears if one takes the more recent ALEPH data.
Ceron Victoria E.
Cotti Umberto
Diaz-Cruz Lorenzo J.
Maya Mario
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