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

Aubert, B. and Cheng, C. H. and Doll, D. A. and Echenard, B. and Fang, F. and Hitlin, D. G. and Narsky, I. and Ongmongkolkul, P. and Piatenko, T. and Porter, F. C. (2010) Search for B^+→ℓ^+ν_ℓ recoiling against B^-→D^0ℓ^-ν̅ X. Physical Review D, 81 (5). Art. No. 051101. ISSN 2470-0010.

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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).

Item Type:Article
Related URLs:
URLURL TypeDescription
Cheng, C. H.0000-0002-8382-0447
Hitlin, D. G.0000-0003-4028-6982
Porter, F. C.0000-0003-1948-8889
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.
Funding AgencyGrant Number
Department of EnergyUNSPECIFIED
Natural Sciences and Engineering Research Council (Canada)UNSPECIFIED
Commissariat à l'Énergie Atomique (French Atomic Energy Commission)UNSPECIFIED
Centre National de la Recherche Scientifique (National Center for Scientific Research, France) Institut National de Physique Nucléaire et Physique des Particules (France)UNSPECIFIED
Bundesministerium für Bildung und Forschung (German: Federal Ministry of Education and Research; Bonn, Germany)UNSPECIFIED
Deutsche Forschungsgemeinschaft (German Research Council)UNSPECIFIED
Istituto Nazionale di Fisica Nucleare, ItalyUNSPECIFIED
Foundation for Fundamental Research on Matter (The Netherlands)UNSPECIFIED
Research Council of NorwayUNSPECIFIED
Ministry of Education and Science of the Russian FederationUNSPECIFIED
Ministerio de Educación y Ciencia (Spain: Ministry for Education and Science)UNSPECIFIED
Science and Technology Facilities Council (UK)UNSPECIFIED
Marie Curie EIF (European Union)UNSPECIFIED
A. P. Sloan FoundationUNSPECIFIED
Issue or Number:5
Classification Code:PACS: 13.20.-v, 12.15.Ji, 13.25.Hw
Record Number:CaltechAUTHORS:20100514-080152522
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18304
Deposited By: Ruth Sustaita
Deposited On:14 May 2010 16:03
Last Modified:09 Mar 2020 13:18

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