Measurement of the tau branching fractions into leptons

Achard, P. ; Adriani, O. ; Aguilar-Benitez, M. ; Gurtu, A. ; et., al (2001) Measurement of the tau branching fractions into leptons Physics Letters B, 507 (1-4). pp. 47-60. ISSN 0370-2693

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Using data collected with the L3 detector near the Z resonance, corresponding to an integrated luminosity of 150 pb−1, the branching fractions of the tau lepton into electron and muon are measured to be B(τ→eν̅eντ) = (17.806±0.104 (stat.) ± 0.076 (syst.) %, B(τ→μν̅ντ) = (17.342±0.110 (stat.) ± 0.067 (syst.) %. From these results the ratio of the charged current coupling constants of the muon and the electron is determined to be gμ/ge=1.0007±0.0051. Assuming electron-muon universality, the Fermi constant is measured in tau lepton decays as GF=(1.1616±0.0058)×10−5 GeV−2. Furthermore, the coupling constant of the strong interaction at the tau mass scale is obtained as αs(m2τ) = 0.322 ± 0.009(exp.) ± 0.015 (theory).

Item Type:Article
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ID Code:83427
Deposited On:21 Feb 2012 07:35
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