Limits on the electromagnetic and weak dipole moments of the tau-lepton in a 331 model

Abstract

Using as an input the data obtained by the L3 and OPAL Collaborations for the reaction $e^{+}{e}^{-}\to {\tau }^{+}{\tau }^{-}\gamma$ at the $Z_1$-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 $e^{+}{e}^{-}\to {\tau }^{+}{\tau }^{-}\gamma$. 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 $e^{+}{e}^{-}\to {\tau }^{+}{\tau }^{-}$. Our work complements other studies on the electromagnetic and weak dipole moments of the tau-lepton.