Determinations of |Vub| from Inclusive Semileptonic B Decays with Reduced Model Dependence

Abstract

We report two novel determinations of |Vub| with reduced model dependence, based on measurements of the mass distribution of the hadronic system in semileptonic B decays. Events are selected by fully reconstructing the decay of one B meson and identifying a charged lepton from the decay of the other B meson from Y(4S) to BBbar events. In one approach, we combine the inclusive B to X_u l nu rate, integrated up to a maximum hadronic mass m_X < 1.67GeV, with a 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 approach we 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.

4 pages, 3 postscript figues, submitted to PRL

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• Theoretical Uncertainties in Gamma_sl(b->u)
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Cited by in corpus (14)

• Flavor Physics in the Quark Sector
• B, D and K decays
• New Physics at a Super Flavor Factory
• Challenges in Semileptonic B Decays
• Semi-Inclusive B Decays and a Model for Soft-Gluon Effects
• Subleading Shape-Function Effects and the Extraction of |V_ub|
• Extraction of |Vub| with Reduced Dependence on Shape Functions
• Precision Determination of $|V_{ub}|$
• A Review of the Magnitudes of the CKM Matrix Elements
• Comparative analysis of non-perturbative effects in B -> X_u l anti-nu_l decays
• Semileptonic B-Meson Decays at BaBar
• Long distance effects in semi-inclusive B decays
• Status of |Vub|, |Vcb| and their relative phase
• Review of Recent Measurements of the Sides of the CKM Unitarity Triangle