An upper limit on the anomalous magnetic moment of the τlepton
Loading...
Date
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Description
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.
20 pages, LaTeX, uses a4p.sty, 4 eps figures included, submitted to Phys. Lett. B
20 pages, LaTeX, uses a4p.sty, 4 eps figures included, submitted to Phys. Lett. B