%0 Journal Article
%T Studies of tau(-) -> eta K- nu(tau) and tau(-) -> eta pi(-) nu(tau) at BABAR and a search for a second-class current
%A BABAR Collaboration (del Amo Sanchez, P. et al
%A Lopez-March, N.
%A Martinez-Vidal, F.
%A Milanes, D. A.
%A Oyanguren, A.
%J Physical Review D
%D 2011
%V 83
%N 3
%I Amer Physical Soc
%@ 1550-7998
%G English
%F BABARCollaborationdelAmoSanchez_etal2011
%O ISI:000286883700003
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=564), last updated on Mon, 11 Apr 2011 17:03:03 +0000
%X 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).
%R 10.1103/PhysRevD.83.032002
%U http://arxiv.org/abs/arXiv:1011.3917
%U https://doi.org/10.1103/PhysRevD.83.032002
%P 032002-10pp