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Published February 1, 2011 | Published
Journal Article Open

Studies of τ^- → ηK^-ν-τ and τ^- → ηπ^- ν_τ at BABAR and a search for a second-class current


We report on analyses of tau lepton decays τ^- → ηK^-ν_τ and τ^- → ηπ^-ν_τ, with η → π^+π^-π^0, using 470  fb^(-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^-ν_τ decay mode, B(τ^- → ηK^-ν_τ)=(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^-ν_τ, B(τ^- → ηπ^-ν_τ)<9.9 × 10^(-5).

Additional Information

© 2011 American Physical Society. Received 17 November 2010; published 2 February 2011. We are grateful for the extraordinary contributions of our PEP-II colleagues in achieving the excellent luminosity and machine conditions that have made this work possible. The success of this project also relies critically on the expertise and dedication of the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and the kind hospitality extended to them. This work is supported by the U.S. Department of Energy and National Science Foundation, the Natural Sciences and Engineering Research Council (Canada), the Commissariat à l'Energie Atomique and Institut National de Physique Nucléaire et de Physique des Particules (France), the Bundesministerium für Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany), the Istituto Nazionale di Fisica Nucleare (Italy), the Foundation for Fundamental Research on Matter (The Netherlands), the Research Council of Norway, the Ministry of Education and Science of the Russian Federation, Ministerio de Ciencia e Innovación (Spain), and the Science and Technology Facilities Council (United Kingdom). Individuals have received support from the Marie-Curie IEF program (European Union), the A. P. Sloan Foundation (USA), and the Binational Science Foundation (U.S.–Israel).

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