Measurement of the Inclusive Electron Spectrum in Charmless Semileptonic B Decays Near the Kinematic Endpoint and Determination of |Vub|

Abstract

We present a measurement of the inclusive electron spectrum in charmless semileptonic B decays near the kinematic limit for B->X_c eνtransitions, using a sample of 88 million Upsilon(4S) decays recorded by the BABAR detector. Partial branching fraction measurements are performed in five overlapping intervals of the electron momentum. For the interval of 2.0-2.6 GeV/c we obtain ΔBr(B->X_u eν) = (0.572+-0.041(stat)+-0.065(syst))x10^{-3}. Combining this result with shape function parameters extracted from BABAR measurements of moments of the inclusive photon spectrum in B->X_s+gamma decays and moments of the hadron mass and lepton energy spectra in B->X_c lνdecays we determine |V_{ub}|=((4.44+-0.25(exp) ^{+0.42}_{-0.38}(SF)+-0.22(theory))x10^{-3}. Here the first error represents the combined statistical and systematic experimental uncertainties of the partial branching fraction measurement, the second error refers to the uncertainty of the determination of the shape function parameters, and the third error is due to theoretical uncertainties in the QCD calculations.

arXiv comment19 pages, 6 figures; minor textual changes, references fixed; version to appear in Phys. Rev. D

References in corpus (43)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• The BABAR Detector
• Observation of Large CP Violation in the Neutral B Meson System
• Observation of CP violation in the B^0 meson system
• Semileptonic Meson Decays in the Quark Model: An Update
• Inclusive Semileptonic B and Polarized Lambda_b Decays from QCD
• Branching Fraction and Photon Energy Spectrum b -> s gamma
• Dispersive Bounds on the Shape of B -> D^(*) l nu Form Factors
• Differential Distributions in Semileptonic Decays of the Heavy Flavors in QCD
• On the Motion of Heavy Quarks inside Hadrons: Universal Distributions and Inclusive Decays
• Measurement of the CP-Violating Asymmetry Amplitude sin2beta
• Aspects Of Heavy Quark Theory
• Analysis of the Photon Spectrum in Inclusive $B\to X_s\gamma$ Decays
• Factorization and Shape-Function Effects in Inclusive B-Meson Decays
• An inclusive measurement of the photon energy spectrum in b->s gamma decays
• QCD-Based Interpretation of the Lepton Spectrum in Inclusive $\bar{B}\to X_u\ell \bar{\nu }$ Decays
• Improved Measurement of Mixing-induced CP Violation in the Neutral B Meson System
• Theory of Charmless Inclusive B Decays and the Extraction of V_{ub}
• B decays in the upsilon expansion
• A Study of Time-Dependent CP-Violating Asymmetries and Flavor Oscillations in Neutral B Decays at the Upsilon(4S)
• Renormalization-Group Improved Calculation of the B->Xs+gamma Branching Ratio
• Shape function effects in B -> X_s gamma and B -> X_u l nu decays
• B -> X_u l nu decay distributions to order alpha_s
• Measurements of the B -> X_s gamma Branching Fraction and Photon Spectrum from a Sum of Exclusive Final States
• Subleading Shape Functions in Inclusive B Decays
• The second order QCD contribution to the semileptonic b -> u decay rate
• Improved Measurement of |V_ub| with Inclusive Semileptonic B Decays
• Soft Pion Emission in Semileptonic $B$-Meson Decays
• Determination of the Branching Fraction for B --> Xc l nu Decays and of |Vcb| from Hadronic-Mass and Lepton-Energy Moments
• On the photon energy moments and their `bias' corrections in B -> X_s+γ
• Observation of Mixing-induced CP Violation in the Neutral B Meson System
• Measurement of Br(Bbar -> D+l-nubar) and Determination of |Vcb|
• Measurement of the $B\to D\ell \nu$ Branching Fractions and Form Factor
• Measurement of |V_ub| near the endpoint of the electron momentum spectrum from semileptonic B-meson decays
• Two-Loop Relations for Heavy-Quark Parameters in the Shape-Function Scheme
• Theoretical Uncertainties in Gamma_sl(b->u)
• Measurement of |V_ub| using inclusive B -> X_u l nu decays with a novel X_u-reconstruction method
• Determination of |Vub| from Measurements of the Electron and Neutrino Momenta in Inclusive Semileptonic B Decays
• Heavy quark symmetry in B -> D(*) ell nu spectra
• Measurement of the Branching Fraction for Inclusive Semileptonic B Meson Decays
• Determination of |Vub|/|Vcb| with DELPHI at LEP
• Measurement of Vub using b hadron semileptonic decays
• Impact of Four-Quark Shape Functions on Inclusive B Decay Spectra

Cited by in corpus (36)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• The Physics of the B Factories
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2018
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• Flavor Physics in the Quark Sector
• Inclusive semileptonic B decays and the determination of |V_ub|
• Inclusive spectra in charmless semileptonic B decays by Dressed Gluon Exponentiation
• B, D and K decays
• Challenges in Semileptonic B Decays
• Measurement of the Branching Fraction and Photon Energy Moments of B->X_s gamma and A_{cp}(B->X_(s+d) gamma)
• Semi-Inclusive B Decays and a Model for Soft-Gluon Effects
• Inclusive Measure of |V_ub| with the Analytic Coupling Model
• A Study of Exclusive Charmless Semileptonic B Decay and |V_ub|
• The CKM Parameters
• Measurement and interpretation of moments in inclusive semileptonic decays Bbar --> X_c l- nubar
• Study of Bbar --> Xu l nubar decays in BBbar events tagged by a fully reconstructed B-meson decay and determination of |V_{ub}|
• On the $O({\alpha }_s^2)$ corrections to $b\to X_{u}e\bar{\nu }$ inclusive decays
• The Heavy Quark Expansion for Inclusive Semileptonic Charm Decays Revisited
• Determinations of |Vub| from Inclusive Semileptonic B Decays with Reduced Model Dependence
• Measurements of the B to D* Form Factors Using the Decay B0 --> D* e nu_e
• Measurement of the inclusive electron spectrum from B meson decays and determination of |Vub|
• B Meson Decays
• NNVub: a Neural Network Approach to $B\to X_u\ell \nu$
• A Study of Exclusive Charmless Semileptonic B Decays and Extraction of |V_{ub}| at CLEO
• NNLO corrections to B --> X_u l nu and the determination of |V_ub|
• Brief review on semileptonic B decays
• Neural network parametrization of the lepton energy spectrum in semileptonic B meson decays
• Quark mixing and CP violation - the CKM matrix
• Subleading Shape-Function Effects and the Extraction of |V_ub|
• Extraction of |Vub| with Reduced Dependence on Shape Functions
• 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
• On the determination of |V_{ub}| from inclusive semileptonic B decays
• Vub extraction using the Analytic Coupling model
• Review of Recent Measurements of the Sides of the CKM Unitarity Triangle
• Semileptonic B decays and the inclusive determination of |V(ub)|