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Title

Search for B+ -> l(+)nu(l) recoiling against B- -> D(0)l(-)(nu)over-barX

AuthorsBabar Collaboration; Azzolini, Virginia; López-March, Neus CSIC; Martínez-Vidal, Fernando CSIC ORCID; Milanés, Diego A. CSIC; Oyanguren, Arantza CSIC ORCID; Aubert, B.; Lees, J. P.
Issue Date1-Mar-2010
PublisherAmerican Physical Society
CitationPhysical Review - Section D - Particles and Fields 81 (5): 051101 (2010)
AbstractWe present a search for the decay B+ -> l(+)nu(l) (l = tau, mu, or e) in (458.9 +/- 5.1) x 10(6) B (B) over bar 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(0)l(-)(nu) over barX. Using the method of Feldman and Cousins, we obtain B(B+ -> tau(+)nu(tau)) = (1.7 +/- 0.8 +/- 0.2) x 10(-4), which excludes zero at 2.3 sigma. 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) x 10(3) MeV2. We find no evidence for B+ -> e(+)nu(e) and B+ -> mu(+)nu(mu) and set upper limits at the 90% C. L. B(B+ -> e(+)nu(e)) < 0.8 x 10(-5) and B(B+ -> mu(+)nu(mu)) < 1.1 x 10(-5).
Publisher version (URL)http://dx.doi.org/ 10.1103/PhysRevD.81.051101
URIhttp://hdl.handle.net/10261/23452
DOI10.1103/PhysRevD.81.051101
ISSN1550-7998
Appears in Collections:(IFIC) Artículos




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