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Title:	Search for B+ -> tau(+)nu
Authors:	Aubert, B.; Garra Tico, J.; Grauges, E.; Azzolini, Virginia; López-March, Neus ; Martínez-Vidal, Fernando ; Milanés, Diego A. ; Oyanguren, Arantza ; 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:	http://dx.doi.org/10.1103/PhysRevD.76.052002
ISSN:	1550-7998
Appears in Collections:	(IFIC) Artículos