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Published March 1, 2010 | Version Published
Journal Article Open

Search for B^+→ℓ^+ν_ℓ recoiling against B^-→D^0ℓ^-ν̅ X

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Abstract

We present a search for the decay B^+→ℓ^+ν_ℓ(ℓ=τ, μ, or  e) in (458.9±5.1)×10^6 BB̅ pairs recorded with the BABAR detector at the PEP-II B-factory. We search for these B decays in a sample of B^+B^- events where one B-meson is reconstructed as B^-→D^0ℓ^-ν̅ X. Using the method of Feldman and Cousins, we obtain B(B^+→τ^+ν_τ)=(1.7±0.8±0.2)×10^(-4), which excludes zero at 2.3σ. We interpret the central value in the context of the standard model and find the B meson decay constant to be f_B^2=(62±31)×10^3   MeV^2. We find no evidence for B^+→e^+ν_e and B^+→μ^+ν_μ and set upper limits at the 90% C.L. B(B^+→e^+ν_e)<0.8×10^(-5) and B(B^+→μ^+ν_μ)<1.1×10^(-5).

Additional Information

© 2010 The American Physical Society. Received 14 December 2009; published 30 March 2010. This work is supported by DOE and NSF (USA), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MEC (Spain), and STFC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union) and the A. P. Sloan Foundation.

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Additional details

Identifiers

Eprint ID
18304
Resolver ID
CaltechAUTHORS:20100514-080152522

Funding

Department of Energy
NSF
Natural Sciences and Engineering Research Council (Canada)
Commissariat à l'Énergie Atomique (French Atomic Energy Commission)
Centre National de la Recherche Scientifique (National Center for Scientific Research, France) Institut National de Physique Nucléaire et Physique des Particules (France)
Bundesministerium für Bildung und Forschung (German: Federal Ministry of Education and Research; Bonn, Germany)
Deutsche Forschungsgemeinschaft (German Research Council)
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 Educación y Ciencia (Spain: Ministry for Education and Science)
Science and Technology Facilities Council (UK)
Marie Curie EIF (European Union)
A. P. Sloan Foundation

Dates

Created
2010-05-14
Created from EPrint's datestamp field
Updated
2021-11-08
Created from EPrint's last_modified field