Measurements Of Charged Current Lepton Universality And Vertical Bar V-Us Vertical Bar Using Tau Lepton Decays To E(-)(Nu)Over-Bar(E)Nu(Tau), Mu(-)(Nu)Over-Bar(Mu)Nu(Tau), Pi(-)Nu(Tau), And K-Nu(Tau)

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PHYSICAL REVIEW LETTERS（2010）

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摘要

Using 467 fb(-1) of e(+)e(-) annihilation data collected with the BABAR detector, we measure B(tau(-)->mu(-)(nu) over bar (mu)nu(tau))/B(tau(-)-> e(-)(nu) over bar (e)nu(tau)) = (0.9796 +/- 0.0016 +/- 0.0036), B(tau(-)->pi(-)nu(tau))/B(tau(-)-> e(-)nu(e)nu(tau)) = (0.5945 +/- 0.0014 +/- 0.0061), and B(tau(-)-> K-nu(tau))/B(tau(-)-> e(-)nu(e)nu(tau)) = (0.03882 +/- 0.00032 +/- 0.00057), where the uncertainties are statistical and systematic, respectively. From these precision similar to measurements, we test the standard model assumption of mu - e and tau - mu charge current lepton universality and provide determinations of vertical bar V-us vertical bar experimentally independent of the decay of a kaon.

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