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- W159458547 abstract "We present a preliminary measurement of the inclusive charmless semileptonic branching fraction of the B meson, based on $140 fb^{-1}$ of data collected by the Belle detector at the KEKB $e^+e^-$ asymmetric collider. Events are tagged by fully reconstructing one of the B mesons, produced in pairs from $Upsilon(4S)$. The signal for $b to u$ semileptonic decay is distinguished from the $b to c$ semileptonic background using the hadronic and leptonic invariant mass distributions $M_X$ and $q^2$. We find the partial branching fraction for the kinematical region given by $M_X < 1.7 GeV/c^2$ and $q^2>8 {GeV}^2/c^2$, $Delta{cal{B}}(B to X_u ell nu) = [0.99 pm 0.15 (stat) pm 0.18 (syst) pm 0.04 (bto u) pm 0.07 (bto c)]times 10^{-3}$. Using a theoretical prediction for the extrapolation to the full range of $M_X$ and $q^2$ variables, we obtain ${cal{B}}(B to X_u ell nu) = [3.37 pm 0.50 (stat)pm 0.60 (syst) pm 0.14 (bto u) pm 0.24 (bto c) pm 0.50 (f_u error)] times 10^{-3}$. From this measurement, the magnitude of the the Cabibbo-Kobayashi-Maskawa matrix element $V_{ub}$ is $|V_{ub}|= [5.54 pm 0.42 (stat) pm 0.50 (syst) pm 0.12 (bto u) pm 0.19 (bto c) pm 0.42 (f_u error) pm 0.27 ({cal{B}} to |V_{ub}| error)] times 10^{-3}$." @default.
- W159458547 created "2016-06-24" @default.
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