A Search for B+ -> tau+ nu Recoiling Against B- -> 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 central value in the context of the Standard Model and find the B meson decay constant to be $f_B^2=(62\pm 31)\times 10^3{\mathrm{MeV}}^2$. We find no evidence for $B^{+}\to e^{+}{\nu }_e$ and $B^{+}\to {\mu }^{+}{\nu }_{\mu }$ and set upper limits at the 90% C.L. $\mathcal{B}(B^{+}\to e^{+}{\nu }_e)<0.8\times 10^{-5}$ and $\mathcal{B}(B^{+}\to {\mu }^{+}{\nu }_{\mu })<1.1\times 10^{-5}$.

8 pages, 8 postscript figures, submitted to Physical Review D (Rapid Communications)

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