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Measurements of Charged Current Lepton Universality and ∣Vus∣|V_{us}| using Tau Lepton Decays to e−νˉeντe^- \bar{\nu}_e \nu_\tau, μ−νˉμντ\mu^- \bar{\nu}_\mu \nu_\tau, π−ντ\pi^- \nu_\tau, and K−ντK^- \nu_\tau

Collaboration
Dec, 2009
9 pages
Published in:
  • Phys.Rev.Lett. 105 (2010) 051602
e-Print:
DOI:
Report number:
  • BABAR-PUB-09-018,
  • SLAC-PUB-13846
Experiments:
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Abstract: (arXiv)
Using 467 fb−1fb^{-1} of e+e−e^+e^- annihilation data collected with the BaBar detector, we measure B(τ−→μ−νˉμντ)B(τ−→e−νˉeντ)=(0.9796±0.0016±0.0036)\frac{{\cal{B}}(\tau^- \to \mu^- \bar{\nu}_\mu \nu_\tau)}{{\cal{B}}(\tau^- \to e^- \bar{\nu}_e \nu_\tau)} = (0.9796 \pm 0.0016 \pm 0.0036), B(τ−→π−ντ)B(τ−→e−νˉeντ)=(0.5945±0.0014±0.0061)\frac{{\cal{B}}(\tau^- \to \pi^- \nu_\tau)}{{\cal{B}}(\tau^- \to e^- \bar{\nu}_e \nu_\tau)} = (0.5945 \pm 0.0014 \pm 0.0061), and B(τ−→K−ντ)B(τ−→e−νˉeντ)=(0.03882±0.00032±0.00057)\frac{{\cal{B}}(\tau^- \to K^- \nu_\tau)}{{\cal{B}}(\tau^- \to e^- \bar{\nu}_e \nu_\tau)} = (0.03882 \pm 0.00032 \pm 0.00057), where the uncertainties are statistical and systematic, respectively. From these precision τ\tau measurements, we test the Standard Model assumption of μ\mu-ee and τ\tau-μ\mu charge current lepton universality and provide determinations of ∣Vus∣|V_{us}| experimentally independent of the decay of a kaon and which we compare with the value predicted from the unitarity of the Cabibbo-Kobayashi-Maskawa matrix.
Note:
  • 7 pages, 1 encapsulated postscript figures, Phys. Rev. Lett 105, 051602 (2010)
  • 11.30.Hv
  • 12.15.Hh
  • 14.60.Fg
  • 13.35.Dx
  • lepton: universality
  • tau-: decay modes
  • CKM matrix: unitarity
  • charged current
  • electron positron: annihilation
  • tau: pair production
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