We report on analyses of tau lepton decays tau(-) -> eta K(-) nu(tau) and tau(-) -> eta pi(-) nu(tau) with eta -> pi(+) pi(-) pi(0) using 470 fb(-1) of data from the BABAR experiment at PEP-II collected at center-of-mass energies at and near the Y(4S) resonance. We measure the branching fraction for the tau(-) -> eta K(-) nu(tau) decay mode B(tau(-) -> eta K(-) nu(tau)) = (1.42 +/- 0.11(stat) +/- 0.07(syst)) x 10(-4) and report a 95% confidence level upper limit for the second-class current process tau(-) -> eta pi(-) nu(tau) B(tau(-) -> eta pi(-) nu(tau)) < 9.9 x 10(-5).
Studies of tau(-) -> eta K(-) nu(tau) and tau(-) -> eta pi(-) nu(tau) at BABAR and a search for a second-class current
ANDREOTTI, Mirco;BETTONI, Diego;BOZZI, Concezio;CALABRESE, Roberto;CECCHI, Annalisa;CIBINETTO, Gianluigi;FIORAVANTI, Elisa;FRANCHINI, Paolo;LUPPI, Eleonora;MUNERATO, Mauro;NEGRINI, Matteo;PETRELLA, Antonio;PIEMONTESE, Livio;
2011
Abstract
We report on analyses of tau lepton decays tau(-) -> eta K(-) nu(tau) and tau(-) -> eta pi(-) nu(tau) with eta -> pi(+) pi(-) pi(0) using 470 fb(-1) of data from the BABAR experiment at PEP-II collected at center-of-mass energies at and near the Y(4S) resonance. We measure the branching fraction for the tau(-) -> eta K(-) nu(tau) decay mode B(tau(-) -> eta K(-) nu(tau)) = (1.42 +/- 0.11(stat) +/- 0.07(syst)) x 10(-4) and report a 95% confidence level upper limit for the second-class current process tau(-) -> eta pi(-) nu(tau) B(tau(-) -> eta pi(-) nu(tau)) < 9.9 x 10(-5).File in questo prodotto:
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