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Published November 26, 2012 | Published
Journal Article Open

Branching fraction of τ^- → π^-K_s^0K_s^0(π^0)ν_τ decays


We present a study of τ^- → π^-K_S^0K_S^0(π^0)ν_τ and τ^- → K^-K_S^0K_S^0(π^0)ν_τ decays using a data set of 430 million τ lepton pairs, corresponding to an integrated luminosity of 468  fb^(-1), collected with the BABAR detector at the PEP-II asymmetric energy e^+e^- storage rings. We measure branching fractions of 2.31±0.04±0.08)×10^(-4) and (1.60±0.20±0.22)×10^(-5) for the τ^- → π^-K_S^0K_S^0ν_τ and τ^- → π^-K_S^0K_S^0π^0ν_τ decays, respectively. We find no evidence for τ^- → K^-K_S^0K^S^0ν_τ and τ^- → K^-K_S^0K_S^0π^0ν_τ decays and place upper limits on the branching fractions of 6.3×10^(-7) and 4.0×10^(-7) at the 90% confidence level.

Additional Information

© 2012 American Physical Society. Received 2 August 2012; published 26 November 2012. 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 Innovaciόn (Spain), and the Science and Technology Facilities Council (United Kingdom). Individuals have received support from the Marie-Curie IEF program (European Union) and the A. P. Sloan Foundation (USA).

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Published - PhysRevD.86.092013.pdf


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