Using radiative Z0 → τ+τ- γ events collected with the OPAL detector at LEP at √s = MZ during 1990-95, a direct study of the electromagnetic current at the τγ vertex has been performed in terms of the anomalous magnetic form factor F2 of the T lepton. The analysis is based on a data sample of 1429 e+e- → τ+τ- γ events which are examined for a deviation from the expectation with F2 = 0. From the non-observation of anomalous τ+τ- γ production a limit of - 0.068 < F2 < 0.065 is obtained. This can also be interpreted as a limit on the electric dipole form factor F3 as |eF3| < 3.7 × 10-16 e cm. The above ranges are valid at the 95% confidence level.
|Number of pages||11|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - 9 Jul 1998|
ASJC Scopus subject areas
- Nuclear and High Energy Physics