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 RID C-5223-2009

BIANCHI, Fabrizio;GAMBA, Diego;PELLICCIONI, Mario;
2011-01-01

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).
2011
83
032002
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P. D. Sanchez;J. P. Lees;V. Poireau;E. Prencipe;V. Tisserand;J. G. Tico;E. Grauges;M. Martinelli;A. Palano;M. Pappagallo;G. Eigen;B. Stugu...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/91633
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