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We report the measurement of an inclusive partial branching fraction forcharmless semileptonic B decay and the extraction of |V_ub|. Candidates for B-> X_u l nu are identified with a novel X_u-reconstruction method based onneutrino reconstruction via missing 4-momentum and a technique called``simulated annealing.'' Based on 86.9/fb of data taken with the Belledetector, we obtain Br (B -> X_u l nu ; M_X<1.7 GeV/c^2, q^2>8.0 GeV^2/c^2) =  (7.37 +- 0.89(stat.) +- 1.12(syst.) +- 0.55(b -> c) +- 0.24(b -> u)) x10^(-4) and determine |V_ub| = (4.66 +- 0.28(stat.) +- 0.35(syst.) +- 0.17(b ->c) +- 0.08(b -> u) +- 0.58(theory)) x 10^(-3).Comment: 6 pages, 4 figure

physical review letters

Measurement of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo stretchy="false">|</mml:mo><mml:msub><mml:mi>V</mml:mi><mml:mrow><mml:mi>u</mml:mi><mml:mi>b</mml:mi></mml:mrow></mml:msub><mml:mo stretchy="false">|</mml:mo></mml:math>Using Inclusive<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi><mml:mo>→</mml:mo><mml:msub><mml:mi>X</mml:mi><mml:mi>u</mml:mi></mml:msub><mml:mi>ℓ</mml:mi><mml:mi>ν</mml:mi></mml:math>…

Measurement of|Vub|Using InclusiveB→Xuℓν…