Abstract

Using as an input the data obtained by the L3 and OPAL Collaborations for the reaction e+e− → τ+τ−γ at the Z-pole, we obtained bounds on the electromagnetic and weak dipole moments of the tau-lepton in the context of a 331 model. Our bounds on the electromagnetic moments are consistent with the bounds obtained by the L3 and OPAL Collaborations for the reaction e+e− → τ+τ−γ. We also obtained bounds on the tau weak dipole moments which are consistent with the bounds obtained recently by the DELPHI, ALEPH and BELLE Collaborations from the reaction e+e− → τ+τ−. In addition, we obtained a limit on the Z–Z′ mixing angle of the 331 model: −3.92 × 10−3 ⩽ ϕ ⩽ 1.30 × 10−4, which is competitive with those reported in the literature. Our work complements other studies on the electromagnetic and weak dipole moments of the tau-lepton and on the Z–Z′ mixing angle.

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