Search for anomalous weak dipole moments of the tau lepton

Details Search for anomalous weak dipole moments of the tau lepton Search for anomalous weak dipole moments of the tau lepton

2002-09-25

arxiv.org/abs/hep-ex/0209066v1

Eur.Phys.J.C30:291-304,2003

Physics

High Energy Physics

High Energy Physics - Experiment

22 pages, 6 figures

Scientific paper

10.1140/epjc/s2003-01286-1

The anomalous weak dipole moments of the tau lepton are measured in a data sample collected by ALEPHfrom 1990 to 1995 corresponding to an integrated luminosity of 155pb-1. Tau leptons produced in the reaction e+e- -> tau+tau- at energies close to the Z mass are studied using their semileptonic decays to pi, rho, a_1 -> pi 2pi0 or a_1 -> 3 pi. The real and imaginary components of both the anomalous weak magnetic dipole moment and the CP-violating anomalous weak electric dipole moment, Re,mu_tau, Im,mu_tau, Re, d_tau and Im, d_tau, are measured simultaneously by means of a likelihood fit built from the full differential cross section. No evidence of new physics is found. The following bounds are obtained 95% CL: |Re, mu_tau | < 1.14 x 10-3, |Im}, mu_tau | < 2.65 x 10-3, |Re}, d_tau | < 0.91 x 10-3, and |Im, d_tau | < 2.01 x 10-3.

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