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We report two novel determinations of |Vub| with reduced model dependence,based on measurements of the mass distribution of the hadronic system insemileptonic B decays. Events are selected by fully reconstructing the decay ofone B meson and identifying a charged lepton from the decay of the other Bmeson from Y(4S) to BBbar events. In one approach, we combine the inclusive Bto X_u l nu rate, integrated up to a maximum hadronic mass m_X < 1.67GeV, witha measurement of the inclusive B to X_s gamma photon energy spectrum. We obtain|Vub| = (4.43 +- 0.38stat +- 0.25syst +- 0.29theo)*10^-3. In another approachwe measure the total B to X_u l nu rate over the full phase space and find|Vub| = (3.84 +- 0.70stat +- 0.30syst +- 0.10theo)*10^-3.Comment: 4 pages, 3 postscript figues, submitted to PR

physical review letters

Determinations 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>from Inclusive Semileptonic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math>Decays with Reduced Model Dependence

Determinations of|Vub|from Inclusive SemileptonicBDecays with Reduced Model Dependence