Using 467 fb(-1) of e+e- annihilation data collected with the BABAR detector, we measure (B( - - ( ) ( )))/(B( - e- (e) ( ))) =(0.9796 0.0016 0.0036), (B( - - ( )))/(B( - e- (e) ( ))) = (0.5945 0.0014 0.0061), and (B( - K- ( )))/(B( - e- (e) ( ))) = (0.03882 0.00032 0.00057), where the uncertainties are statistical and systematic, respectively. From these precision measurements, we test the standard model assumption of -e and - charge current lepton universality and provide determinations of |Vus| experimentally independent of the decay of a kaon.
Measurements of charged current lepton universality and |Vus| using tau lepton decays to e- (e) ( ), - ( ) ( ), - ( ), and K- ( ).
ANDREOTTI, Mirco;CALABRESE, Roberto;CECCHI, Annalisa;CIBINETTO, Gianluigi;FIORAVANTI, Elisa;FRANCHINI, Paolo;LUPPI, Eleonora;MUNERATO, Mauro;NEGRINI, Matteo;PETRELLA, Antonio;SANTORO, Valentina;
2010
Abstract
Using 467 fb(-1) of e+e- annihilation data collected with the BABAR detector, we measure (B( - - ( ) ( )))/(B( - e- (e) ( ))) =(0.9796 0.0016 0.0036), (B( - - ( )))/(B( - e- (e) ( ))) = (0.5945 0.0014 0.0061), and (B( - K- ( )))/(B( - e- (e) ( ))) = (0.03882 0.00032 0.00057), where the uncertainties are statistical and systematic, respectively. From these precision measurements, we test the standard model assumption of -e and - charge current lepton universality and provide determinations of |Vus| experimentally independent of the decay of a kaon.File in questo prodotto:
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