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Published March 1, 2015 | Submitted + Published
Journal Article Open

Measurement of the branching fractions of the radiative leptonic τ decays τ→eγνν[bar] and τ→μγνν[bar] at BABAR


We perform a measurement of the τ→lγνν [bar] (l=e,μ) branching fractions for a minimum photon energy of 10 MeV in the τ rest frame, using 431  fb^(−1) of e^+ e^− collisions collected at the center-of-mass energy of the Υ(4S) resonance with the BABAR detector at the PEP-II storage rings. We find B(τ→μγνν [bar])=(3.69±0.03±0.10)×10^(−3) and B(τ→eγνν[bar]¯ )=(1.847±0.015±0.052)×10^(−2), where the first quoted error is statistical and the second is systematic. These results are substantially more precise than previous measurements.

Additional Information

© 2015 American Physical Society. Received 10 February 2015; Published 25 March 2015. 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 US 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 (Netherlands), the Research Council of Norway, the Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (Spain), the Science and Technology Facilities Council (United Kingdom), and the Binational Science Foundation (US–Israel). Individuals have received support from the Marie-Curie IEF program (European Union) and the A. P. Sloan Foundation (USA).

Attached Files

Published - PhysRevD.91.051103.pdf

Submitted - 1502.01784v1.pdf


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