Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2005-07-14
Phys.Rev.D73:057101,2006
Physics
High Energy Physics
High Energy Physics - Experiment
7 pages, 1 postscript figues, submitted to PRD brief report
Scientific paper
10.1103/PhysRevD.73.057101
We search for the rare leptonic decay B+ --> tau+ nu_tau in a sample of 232x10^6 BBbar pairs collected with the BABAR detector at the SLAC PEP-II B-Factory. Signal events are selected by examining the properties of the B meson recoiling against the semileptonic decay B- --> D*0 l- nu_lbar. We find no evidence for a signal and set an upper limit on the branching fraction of BR(B+ --> tau+ nu_tau) < 2.8x10^{-4} at the 90% confidence level. We combine this result with a previous, statistically independent BABAR search for B+ --> tau+ nu_tau to give an upper limit of BR(B+ --> tau+ nu_tau) < 2.6x10^{-4} at the 90% confidence level.
"The BABAR Collaboration
Aubert B.
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