Published November 1, 1990 | Version v1
Journal article

A determination of electroweak parameters from Z0 decays into charged leptons

Creators

Description

We have measured the partial widths for the three reactions e+e-→Z0→e+e-, μ+μ-, τ+τ-. The results are Γee=84.3±1.3 MeV, √ΓeeΓμμ=83.3±1.3 MeV, and √ΓeeΓττ=83.9±1.4 MeV, where the errors are statistical. The systematic errors are estimated to be 1.0 MeV, 0.9 MeV, and 1.4 MeV, respectively. We perform a simultaneous fit to the cross sections for the e+e-→e+e-, μ+μ-, and τ+τ- data, the differential cross section as a function of polar angle for the electron data, and the forward-backward asymmetry for the muon data. We obtain the leptonic partial with Γll=84.0±0.9(stat). MeV. The systematic error is estimated to be 0.8 MeV. Also, we obtain the axial-vector and vector weak coupling constants of charged leptons, gA=-0.500±0.003 and gV=-0.064-0.013+0.017. (orig.)

Additional details

Publishing Information

Journal Title
Physics Letters, (Section) B
Journal Volume
250
Journal Issue
1/2
Series
Phys. Lett., B.
Journal Page Range
183-192
ISSN
0370-2693
CODEN
PYLBA

Optional Information

Collaborations
L3 Collaboration.