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A Search for B+ -> tau+ nu Recoiling Against B- -> D0 l- nu X

We present a search for the decay $B^+ \to \ell^+ ν_{\ell}$ ($\ell = e,μτ$) 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 $B^- \to D^0 \ell^- νX$. Using the method of Feldman and Cousins, we obtain $\mathcal{B}(B^+ \to τ^+ ν) = (1.7 \pm 0.8 \pm 0.2) \times 10^{-4}$, which excludes zero at $2.3σ$. We interpret the central value in the context of the Standard Model and find the B meson decay constant to be $f^2_B = (62 \pm 31) \times 10^3 \mathrm{MeV}^2$. We find no evidence for $B^+ \to e^+ ν_{e}$ and $B^+ \to μ^+ ν_μ$ and set upper limits at the 90% C.L. $\mathcal{B}(B^+ \to e^+ ν_{e}) < 0.8 \times 10^{-5}$ and $\mathcal{B}(B^+ \to μ^+ ν_μ) < 1.1 \times 10^{-5}$.