A Search for the Decay B+ --> tau+ nu_tau
High Energy Physics - Experiment
2010-03-19 v2
Abstract
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.
Cite
@article{arxiv.hep-ex/0507069,
title = {A Search for the Decay B+ --> tau+ nu_tau},
author = {The BABAR Collaboration and B. Aubert},
journal= {arXiv preprint arXiv:hep-ex/0507069},
year = {2010}
}
Comments
7 pages, 1 postscript figues, submitted to PRD brief report