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- W2140955459 abstract "We present a search for the decay $B^+ to ell^+ nu_{ell} (ell = tau, mu, mathrm{or} e)$ in $(458.9 pm 5.1) times 10^{6}$ $Upsilon(4S)$ decays recorded with the Babar detector at the SLAC PEP-II $B$-Factory. A sample of events with one reconstructed exclusive semi-leptonic B decay ($B^{-}to D^{0} ell^{-}bar{nu} X$) is selected, and in the recoil a search for $B^+ to ell^+ nu_{ell}$ signal is performed. The $tau$ is identified in the following channels: $tau^+ to e^+ nu_e overline{nu}_tau$, $tau^+ to mu^+ nu_{mu} overline{nu}_{tau}$, $tau^+ to pi^+ overline{nu}_{tau}$, and $tau^+ to pi^+ pi^{0} overline{nu}_{tau}$. The analysis strategy and the statistical procedure is set up for the branching fraction extraction or upper limit determination. We determine from the dataset a preliminary measurement of $mathcal{B}(B^+ to tau^+ nu_{tau}) = (1.8 pm 0.8 pm 0.1) times 10^{-4}$, which excludes zero at $2.4 sigma$, and $f_{B} = 230 pm 57 mev $. Combination with the hadronically tagged measurement yields $mathcal{B}(B^+ to tau^+ nu_{tau}) = (1.8 pm 0.6) times 10^{-4}$. We also set preliminary limits on the branching fractions at $mathcal{B}(B^+ to e^+ nu_{e}) < 7.7 times 10^{-6} (textrm{90% C.L.})$, $mathcal{B}(B^+ to mu^+ nu_{mu}) < 11 times 10^{-6} (textrm{90% C.L.})$, and $mathcal{B}(B^+ to tau^+ nu_{tau}) < 3.2 times 10^{-4} (textrm{90% C.L.})$." @default.
- W2140955459 created "2016-06-24" @default.
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