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| Title: | Search for B+ -> tau(+)nu |
Authors: | Aubert, B.; Garra Tico, J.; Grauges, E.; Azzolini, Virginia; López-March, Neus CSIC; Martínez-Vidal, Fernando CSIC ORCID; Milanés, Diego A. CSIC; Oyanguren, Arantza CSIC ORCID; Babar Collaboration | Keywords: | Physics B mesons Heavy tau leptons Meson leptonic decay Semileptonic decays Standard model |
Issue Date: | 18-Sep-2007 | Publisher: | American Physical Society | Citation: | Physical Review D 76(5): 052002 (2007) | Abstract: | We 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. | Description: | 12 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/0705.1820 | Publisher version (URL): | http://dx.doi.org/10.1103/PhysRevD.76.052002 | URI: | http://hdl.handle.net/10261/9893 | DOI: | 10.1103/PhysRevD.76.052002 | ISSN: | 1550-7998 |
| Appears in Collections: | (IFIC) Artículos |
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| Aubert_et_al_PRD_76_052002_2007.pdf | 363,96 kB | Adobe PDF |  View/Open |
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