We report on analyses of tau lepton decays τ -→ηK-ντ and τ-→ηπ-ντ, with η→π+π-π0, using 470fb-1 of data from the BABAR experiment at PEP-II, collected at center-of-mass energies at and near the Υ(4S) resonance. We measure the branching fraction for the τ-→ηK-ντ decay mode, B(τ-→ηK-ντ)=(1.42±0. 11(stat)±0.07(syst))×10-4, and report a 95% confidence level upper limit for the second-class current process τ -→ηπ-ντ, B(τ-→ηπ-ντ)<9. 9×10-5.
Sanchez, P., Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Tico, J., et al. (2011). Studies of τ-→ηK-ντ and τ-→ηπ-ντ at BABAR and a search for a second-class current. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 83(3) [10.1103/PhysRevD.83.032002].
Studies of τ-→ηK-ντ and τ-→ηπ-ντ at BABAR and a search for a second-class current
Martinelli M;CARPINELLI, MassimoMembro del Collaboration Group
;
2011
Abstract
We report on analyses of tau lepton decays τ -→ηK-ντ and τ-→ηπ-ντ, with η→π+π-π0, using 470fb-1 of data from the BABAR experiment at PEP-II, collected at center-of-mass energies at and near the Υ(4S) resonance. We measure the branching fraction for the τ-→ηK-ντ decay mode, B(τ-→ηK-ντ)=(1.42±0. 11(stat)±0.07(syst))×10-4, and report a 95% confidence level upper limit for the second-class current process τ -→ηπ-ντ, B(τ-→ηπ-ντ)<9. 9×10-5.
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