Weak electric and magnetic dipole moments of the τ lepton from azimuthal asymmetries

Measurements of the weak electric dipole moment dτw and, for the first time, the weak magnetic dipole moment aτw of the τ lepton using L3 detector at LEP are presented. Azimuthal asymmetries for τ→πν and τ→ρν are used to obtain these measurements. Observed asymmetries are consistent with zero, and the limits set on dτw and aτw are vertical stroke dτw vertical stroke <8.56 x 10-17 e.cm and vertical stroke aτw vertical stroke <0.014 at 95% C.L. (orig.)