Journal article

### A Search for B+ -&gt; tau+ nu Recoiling Against B- -&gt; D0 l- nu X

Abstract:

We present a search for the decay $B^+ \to \ell^+ \nu_{\ell}$ ($\ell = e,\mu\tau$) in $(458.9 \pm 5.1) \times 10^6$ $B\bar{B}$ pairs recorded with the BABAR detector at the PEP-II B-Factory. We search for these B decays in a sample of $B^+B^-$ events where one $B$-meson is reconstructed as $B^- \to D^0 \ell^- \nu X$. Using the method of Feldman and Cousins, we obtain $\mathcal{B}(B^+ \to \tau^+ \nu) = (1.7 \pm 0.8 \pm 0.2) \times 10^{-4}$, which excludes zero at $2.3\sigma$. We interpret the ...

### Access Document

Publisher copy:
10.1103/PhysRevD.81.051101

### Authors

Collaboration, TBABAR More by this author
Publication date:
2009-12-12
DOI:
URN:
uuid:a9379a7c-55f4-472a-97a5-fb63c4422354
Source identifiers:
244699
Local pid:
pubs:244699
Keywords: