Model independent bounds on the tau lepton electromagnetic and weak magnetic moments

Gonzalez-Sprinberg, Gabriel A.; Santamaria, Arcadi; Vidal, Jordi

Model independent bounds on the tau lepton electromagnetic and weak magnetic moments

Authors

Gonzalez-Sprinberg, Gabriel A.

Santamaria, Arcadi

Vidal, Jordi

Description

Using LEP1, SLD and LEP2 data, for tau lepton production, and data from CDF, D0 and LEP2, for W decays into tau leptons, we set model independent limits on non-standard electromagnetic and weak magnetic moments of the tau lepton. The most general effective Lagrangian giving rise to tau moments is used without further assumptions. Precise bounds ($2σ$) on the non-standard model contributions to tau electromagnetic ($-0.007<a_γ< 0.005$), tau Z-magnetic ($-0.0024 <a_Z< 0.0025$) and tau W-magnetic ($-0.003 < κ^W < 0.004$) dipole moments are set from the analysis.
19 pages, 2 figures, elsart.sty. Revised version with new data. Accepted for publication in Nucl. Phys. B