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An upper limit on the anomalous magnetic moment of the τlepton

The OPAL Collaboration·K. Ackerstaff et al
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Abstract

Using radiative Z^0 -> τ^+ τ^- γevents collected with the OPAL detector at LEP at \sqrt{s}= M_Z during 1990-95, a direct study of the electromagnetic current at the τγvertex has been performed in terms of the anomalous magnetic form factor F_2 of the τlepton. The analysis is based on a data sample of 1429 e^+ e^- -> τ^+ τ^- γevents which are examined for a deviation from the expectation with F_2 = 0. From the non-observation of anomalous τ^+ τ^- γproduction a limit of -0.068 < F_2 < 0.065 is obtained. This can also be interpreted as a limit on the electric dipole form factor F_3 as -3.8 x 10^-16 e-cm < eF_3 < 3.6 x 10^-16 e-cm. The above ranges are valid at the 95% confidence level.

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The OPAL Collaboration, K. Ackerstaff et al. 1998-03-22. An upper limit on the anomalous magnetic moment of the τlepton. https://doi.org/10.1016/s0370-2693(98)00520-6

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