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dc.contributor.authorAubert, B.en_US
dc.contributor.authorGarra Tico, J.en_US
dc.contributor.authorGrauges, E.en_US
dc.contributor.authorAzzolini, Virginiaen_US
dc.contributor.authorLópez-March, Neusen_US
dc.contributor.authorMartínez-Vidal, Fernandoen_US
dc.contributor.authorMilanés, Diego A.en_US
dc.contributor.authorOyanguren, Arantzaen_US
dc.contributor.authorBabar Collaboration-
dc.identifier.citationPhysical Review D 76(5): 052002 (2007)en_US
dc.description12 pages, 7 figures.-- PACS nrs.: 13.20.-v; 13.25.Hw.-- ISI Article Identifier: 000249786800009.-- et al. (BABAR Collaboration).-- ArXiv pre-print available at: http://arxiv.org/abs/0705.1820en_US
dc.description.abstractWe present a search for the decay B+ -> tau(+)nu using 383x10(6)B[overline B] over bar pairs collected at the Upsilon(4S) resonance with the BABAR detector at the SLAC PEP-II B-Factory. A sample of events with one reconstructed semileptonic B decay (B --> D(0)l - [overline nu](l)X) is selected, and in the recoil a search for B+ -> tau(+)nu is performed. The tau is identified in the following channels: tau(+)-> e(+)nu[overline nu], tau(+) -> mu(+)nu[overline nu], tau(+) -> pi(+)[overline nu], and tau(+) -> pi(+)pi(0)[overline nu]. We measure a branching fraction of B(B+ -> tau(+)nu)=(0.9 ± 0.6(stat.)± 0.1(syst.))x10(-4). In the absence of a significant signal, we calculate an upper limit at the 90% confidence level of B(B+ -> tau(+)nu)< 1.7x10(-4). We calculate the product of the B meson decay constant f(B) and |Vub| to be f(B)·|Vub|=(7.2(-2.8)(+2.0)(stat.) ± 0.2(syst.))x10(-4) GeV.en_US
dc.description.sponsorshipThis work is supported by the U.S. Department of Energy and National Science Foundation, the Natural Sciences and Engineering Research Council (Canada), Institute of High Energy Physics (China), 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 (The Netherlands), the Research Council of Norway, the Ministry of Science and Technology of the Russian Federation, Ministerio de Educación y Ciencia (Spain), and the Particle Physics and Astronomy Research Council (United Kingdom). Individuals have received support from the Marie-Curie IEF program (European Union) and the A. P. Sloan Foundation.-
dc.format.extent2373 bytes-
dc.publisherAmerican Physical Societyen_US
dc.subjectB mesons-
dc.subjectHeavy tau leptons-
dc.subjectMeson leptonic decay-
dc.subjectSemileptonic decays-
dc.subjectStandard model-
dc.titleSearch for B+ -> tau(+)nuen_US
dc.description.peerreviewedPeer revieweden_US
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