A Search for the Electric Dipole Moment of the Tau-Lepton

Details A Search for the Electric Dipole Moment of the Tau-Lepton A Search for the Electric Dipole Moment of the Tau-Lepton

2000-04-27

arxiv.org/abs/hep-ex/0004031v1

Phys.Lett.B485:37-44,2000

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages, 5 figures (10 subfigures)

Scientific paper

10.1016/S0370-2693(00)00630-4

Using the ARGUS detector at the e+e- storage ring DORIS II, we have searched for the real and imaginary part of the electric dipole formfactor d_tau of the tau lepton in the production of tau pairs at q^2=100 GeV^2. This is the first direct measurement of this CP violating formfactor. We applied the method of optimised observables which takes into account all available information on the observed tau decay products. No evidence for CP violation was found, and we derive the following results: Re(d_tau)=(1.6+-.9)*10^(-16) ecm and Im(d_tau)=(-0.2+-0.8)*10^(-16) ecm, where statistical and systematic errors have been combined.

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