An upper limit on the anomalous magnetic moment of the τlepton

Details An upper limit on the anomalous magnetic moment of the τlepton An upper limit on the anomalous magnetic moment of the τlepton

1998-03-22

arxiv.org/abs/hep-ex/9803020v1

Phys.Lett.B431:188-198,1998

Physics

High Energy Physics

High Energy Physics - Experiment

20 pages, LaTeX, uses a4p.sty, 4 eps figures included, submitted to Phys. Lett. B

Scientific paper

10.1016/S0370-2693(98)00520-6

Using radiative Z^0 -> \tau^+ \tau^- \gamma events collected with the OPAL detector at LEP at \sqrt{s}= M_Z during 1990-95, a direct study of the electromagnetic current at the \tau\gamma vertex has been performed in terms of the anomalous magnetic form factor F_2 of the \tau lepton. The analysis is based on a data sample of 1429 e^+ e^- -> \tau^+ \tau^- \gamma events which are examined for a deviation from the expectation with F_2 = 0. From the non-observation of anomalous \tau^+ \tau^- \gamma production 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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