Improved Bounds on the Electromagnetic Dipole Moments of the Tau Lepton

Abstract

Using electroweak data and an effective Lagrangian approach we obtain stringent bounds on the tau anomalous magnetic moment, $-0.004 \leq a_τ\leq 0.006$, and on its electric dipole moment, $|d_τ| \leq 1.1 \times 10^{-17} e$ cm. This significantly improves our previous bounds. With the same method, we obtain limits on the dipole moments of other fermions.

7 pages, LaTeX. Full postscript file available via anonymous ftp at ftp://ftp.ifae.es/preprint/ft/uabft398.ps