Garra Ticó, JordiGraugés Pous, EugeniBABAR Collaboration2019-06-182019-06-182010-07-280031-9007https://hdl.handle.net/2445/135279Using 467     fb − 1 of e + e − annihilation data collected with the BABAR detector, we measure B ( τ − → μ − ¯ ν μ ν τ ) B ( τ − → e − ¯ ν e ν τ ) = ( 0.9796 ± 0.0016 ± 0.0036 ) , B ( τ − → π − ν τ ) B ( τ − → e − ¯ ν e ν τ ) = ( 0.5945 ± 0.0014 ± 0.0061 ) , and B ( τ − → K − ν τ ) B ( τ − → e − ¯ ν e ν τ ) = ( 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 | V us | experimentally independent of the decay of a kaon.8 p.application/pdfeng(c) American Physical Society, 2010Física de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article6019352019-06-18info:eu-repo/semantics/openAccess