Measurements of charged current lepton universality and |Vus| using tau lepton decays to e-ν̄eντ, μ -ν̄μντ, π-ντ, and K -ντ

Measurements of charged current lepton universality and |Vus| using tau lepton decays to e-ν̄eντ, μ -ν̄μντ, π-ντ, and K -ντ

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Using 467fb-1 of e+e- annihilation data collected with the BABAR detector, we measure B(τ -→μ-ν̄μντ)B(τ -→e-ν̄eντ)=(0.9796±0. 0016±0.0036), B(τ-→π-ντ) B(τ-→e-ν̄eντ)=(0.5945±0. 0014±0.0061), and B(τ-→K-ντ) B(τ-→e-ν̄eντ)=(0.03882±0. 00032±0.00057), where the uncertainties are statistical and systemati...

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Hauptverfasser: Aubert, B, Karyotakis, Y, Lees, J, Poireau, V, Prencipe, E, Prudent, X, Tisserand, V, Garra Tico, J, Grauges, E, Martinelli, M, Palano, A, Pappagallo, M, Eigen, G, Stugu, B, Sun, L, Battaglia, M, Brown, D, Kerth, LT, Kolomensky, Y, Lynch, G, Osipenkov, I, Tackmann, K, Tanabe, T, Hawkes, C, Soni, N
Format: Journal article
Sprache:English
Veröffentlicht: 2010
Beschreibung
Zusammenfassung:Using 467fb-1 of e+e- annihilation data collected with the BABAR detector, we measure B(τ -→μ-ν̄μντ)B(τ -→e-ν̄eντ)=(0.9796±0. 0016±0.0036), B(τ-→π-ντ) B(τ-→e-ν̄eντ)=(0.5945±0. 0014±0.0061), and B(τ-→K-ντ) B(τ-→e-ν̄eντ)=(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 The American Physical Society.

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