Study of high-multiplicity three-prong and five-prong τ decays at BABAR
We present measurements of the branching fractions of three-prong and five-prong τ decay modes using a sample 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 at SLAC National Accelerator Laboratory. The τ^- → (3π)^-ην_τ, τ^- → (3π)^-ων_τ, and τ^- → π^-f_1(1285)ν_τ branching fractions are presented, as well as a new limit on the branching fraction of the second-class current decay τ^- → π^-η^′(958)ν_τ. We search for the decay mode τ^- → K^-η^′(958)ν_τ and for five-prong decay modes with kaons, and place the first upper limits on their branching fractions.
Additional Information© 2012 American Physical Society. Received 14 September 2012; published 27 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).
Published - PhysRevD.86.092010.pdf