Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2001-02-10
Phys.Lett.B507:47-60,2001
Physics
High Energy Physics
High Energy Physics - Experiment
Scientific paper
10.1016/S0370-2693(01)00294-5
Using data collected with the L3 detector near the Z resonance, corresponding to an integrated luminosity of 150pb-1, the branching fractions of the tau lepton into electron and muon are measured to be B(tau->e nu nu) = (17.806 +- 0.104 (stat.) +- 0.076 (syst.)) %, B(tau->mu nu nu) = (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 g_mu/g_e = 1.0007 +- 0.0051. Assuming electron-muon universality, the Fermi constant is measured in tau lepton decays as G_F = (1.1616 +- 0.0058) 10^{-5} GeV^{-2}. Furthermore, the coupling constant of the strong interaction at the tau mass scale is obtained as alpha_s(m_tau^2) = 0.322 +- 0.009 (exp.) +- 0.015 (theory).
No associations
LandOfFree
Measurement of the Tau Branching Fractions into Leptons does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Measurement of the Tau Branching Fractions into Leptons, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measurement of the Tau Branching Fractions into Leptons will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-258826