Using 467  fb-1 of e+e- annihilation data collected with the BABAR detector, we measure B(τ-→μ-ν̅ μντ)/B(τ-→e-ν̅ eντ)=(0.9796±0.0016±0.0036), B(τ-→π-ντ)/B(τ-→e-ν̅ eντ)=(0.5945±0.0014±0.0061), and B(τ-→K-ντ)/B(τ-→e-ν̅ eντ)=(0.03882±0.00032±0.00057), where the uncertainties are statistical and systematic, respectively. From these precision τ measurements, we test the standard model assumption of μ-e and τ-μ charge current lepton universality and provide determinations of |Vus| experimentally independent of the decay of a kaon.

Measurements of Charged Current Lepton Universality and |V(us)| using Tau Lepton Decays to e^- nu(e)-bar nu(tau), mu-bar nu(mu)-bar nu(tau), pi- nu(tau) and K- nu(tau).

BIASINI, Maurizio;PACETTI, Simone;PERUZZI, Ida Marena
2010

Abstract

Using 467  fb-1 of e+e- annihilation data collected with the BABAR detector, we measure B(τ-→μ-ν̅ μντ)/B(τ-→e-ν̅ eντ)=(0.9796±0.0016±0.0036), B(τ-→π-ντ)/B(τ-→e-ν̅ eντ)=(0.5945±0.0014±0.0061), and B(τ-→K-ντ)/B(τ-→e-ν̅ eντ)=(0.03882±0.00032±0.00057), where the uncertainties are statistical and systematic, respectively. From these precision τ measurements, we test the standard model assumption of μ-e and τ-μ charge current lepton universality and provide determinations of |Vus| experimentally independent of the decay of a kaon.
2010
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/931588
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