Published December 2008 | Version Published
Journal Article Open

Measurements of branching fractions for B^+ → p^+γ, B^0 → p^0γ, and B^0 → ωγ

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Abstract

We present branching fraction measurements for the radiative decays B^+ → ρ^+ γ, B^0 → ρ^0 γ, and B^0 → ωγ. The analysis is based on a data sample of 465 × 10^6 B[overline B] events collected with the BABAR detector at the PEP-II asymmetric-energy B Factory located at the Stanford Linear Accelerator Center. We find [script B](B^+ → ρ^+ γ) = (1.20_(-0.37)^(+0.42) ± 0.20) × 10^(-6), [script B](B^0 → ρ^0γ) = (0.97_(-0.22)^(+0.24) ± 0.06) × 10^(-6), and a 90% C.L. upper limit [script B](B^0 → ωγ) < 0.9 × 10^(-6), where the first error is statistical and the second is systematic. We also measure the isospin-violating quantity Γ(B^+ → ρ^+ γ)/2Γ(B^0 → ρ^0γ)-1 = -0.43_(-0.22)^(+0.25)±0.10.

Additional Information

© 2008 The American Physical Society. Received 9 August 2008; published 1 December 2008. We are grateful for the extraordinary contributions of our PEP-II2 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 a` l'Energie Atomique and Institut National de Physique Nucle´aire et de Physique des Particules (France), the Bundesministerium fu¨ r 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 Educacio´n y Ciencia (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.

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Identifiers

Eprint ID
16978
Resolver ID
CaltechAUTHORS:20091214-153229961

Funding

U.S. Department of Energy
NSF
Natural Sciences and Engineering Research Council (Canada)
Commissariat a` l'Energie Atomique and Institut National de Physique Nucle´aire et de Physique des Particules (France)
Bundesministerium furBildung und Forschung and Deutsche Forschungsgemeinschaft (Germany)
Istituto Nazionale di Fisica Nucleare (Italy)
Foundation for Fundamental Research on Matter (The Netherlands)
Research Council of Norway
Ministry of Education and Science of the Russian Federation
Ministerio de Educacio´n y Ciencia (Spain)
Science and Technology Facilities Council (United Kingdom)
Marie-Curie IEF program (European Union)
A. P. Sloan Foundation

Dates

Created
2010-01-05
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Updated
2023-03-16
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