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A determination of electroweak parameters from $Z^{0}$ decays into charged leptons
- Source :
- Physics Letters B, Physics Letters B, Elsevier, 1990, 250, pp.183-192, Physics Letters B, 250, 183-192. [S.l.] : Elsevier science bv, Physics Letters B, 250, 1-2, pp. 183-192, Physics Letters B, 250, 183-192. Elsevier
- Publication Year :
- 1990
- Publisher :
- HAL CCSD, 1990.
-
Abstract
- We have measured the partial widths for the three reactions e + e − → Z 0 → e + e − , μ + μ − , τ + τ − . The results are Γ ee = 84.3±1.3 MeV, √ Γ ee Γ μμ =83.9±1.4 MeV, and √ Γ ee Γ ττ =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 Γ ll =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, g A =−0.500±0.003 and g ν =−0.064 −0.013 +0.017 .
- Subjects :
- Physics
Coupling constant
Nuclear and High Energy Physics
Muon
010308 nuclear & particles physics
Electron–positron annihilation
media_common.quotation_subject
Electroweak interaction
Weinberg angle
Electron
01 natural sciences
7. Clean energy
Asymmetry
Nuclear physics
0103 physical sciences
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
010306 general physics
GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries)
Particle Physics - Experiment
Lepton
media_common
Subjects
Details
- Language :
- English
- ISSN :
- 03702693
- Database :
- OpenAIRE
- Journal :
- Physics Letters B, Physics Letters B, Elsevier, 1990, 250, pp.183-192, Physics Letters B, 250, 183-192. [S.l.] : Elsevier science bv, Physics Letters B, 250, 1-2, pp. 183-192, Physics Letters B, 250, 183-192. Elsevier
- Accession number :
- edsair.doi.dedup.....c94a7d6b64b8ea9b8b5de7ab6ce7481d