Inclusive Measure of |V_ub| with the Analytic Coupling Model

Abstract

By analyzing B -> X_u l nu_l spectra with a model based on soft-gluon resummation and an analytic time-like QCD coupling, we obtain |V_ub| = (3.76 +-0.13 +- 0.22)*10^(-3), where the first and the second error refers to experimental and theoretical errors, respectively. The V_ub value is obtained from the available measured semileptonic branching fractions in limited regions of the phase-space. The distributions in the lepton energy E_l, the hadron invariant mass m_X, the light-cone momentum P_+ = E_X - p_X, together with the double distributions in (m_X,q^2) and (E_l,s_h^max), are used to select the phase-space regions. The q^2 is the dilepton squared momentum and s_h^max is the maximal m_X^2 at fixed q^2 and E_l. The V_ub value obtained is in complete agreement with the value coming from exclusive B decays and from an over-all fit to the Standard Model parameters. We show that the slight disagreement (up to +2 sigma) with respect to previous inclusive measurements is not related to different choices for the b (and c) masses but to a different modelling of the threshold (Sudakov) region.

19 pages, 2 figures, revised version accepted in Eur.Phys.J.C

References in corpus (44)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Analytic Model for the QCD Running Coupling with Universal ${\bar{\alpha }}_s(0)$ Value
• On the Motion of Heavy Quarks inside Hadrons: Universal Distributions and Inclusive Decays
• The Unitarity Triangle Fit in the Standard Model and Hadronic Parameters from Lattice QCD: A Reappraisal after the Measurements of Delta m_s and BR(B to tau nu)
• Hints of large tan(beta) in flavour physics
• Averages of b-hadron and c-hadron Properties at the End of 2007
• Factorization and Shape-Function Effects in Inclusive B-Meson Decays
• B decay and the Upsilon mass
• Theory of Charmless Inclusive B Decays and the Extraction of V_{ub}
• Global analysis of inclusive B decays
• Inclusive semileptonic B decays and the determination of |V_ub|
• Fit to Moments of Inclusive B->Xc lv and B-> Xs gamma Decay Distributions using Heavy Quark Expansions in the Kinetic Scheme
• Top Quark Pair Production close to Threshold: Top Mass, Width and Momentum Distribution
• The Top Cross Section in Hadronic Collisions
• Inclusive spectra in charmless semileptonic B decays by Dressed Gluon Exponentiation
• High Power n of m_b in Beauty Widths and n=5 -> oo Limit
• The UTfit Collaboration Report on the Status of the Unitarity Triangle beyond the Standard Model I. Model-independent Analysis and Minimal Flavour Violation
• Precision determination of |V_{ub}| from inclusive decays
• The second order QCD contribution to the semileptonic b -> u decay rate
• Radiative corrections to $b\to cτ\batν_τ$
• Improved Measurement of |V_ub| with Inclusive Semileptonic B Decays
• Extracting V_{ub} Without Recourse to Structure Functions
• The Extraction of $V_{ub}$ from Inclusive B Decays and the Resummation of End Point Logs
• Semi-Inclusive B Decays and a Model for Soft-Gluon Effects
• Measurement of the Inclusive Electron Spectrum in Charmless Semileptonic B Decays Near the Kinematic Endpoint and Determination of |Vub|
• Measurement of |V_ub| near the endpoint of the electron momentum spectrum from semileptonic B-meson decays
• Charm Quark Mass from Inclusive Semileptonic B Decays
• Measurement of |V_ub| using inclusive B -> X_u l nu decays with a novel X_u-reconstruction method
• Two-loop QCD corrections to semileptonic b decays at an intermediate recoil
• Extracting |V_{ub}| from the Hadronic Mass Spectrum of Inclusive B decays
• Determination of |V_ub| from Measurements of the Inclusive Charmless Semileptonic Partial Rates of B Mesons using Full Reconstruction Tags
• Determination of |Vub| from Measurements of the Electron and Neutrino Momenta in Inclusive Semileptonic B Decays
• A model for next-to-leading order threshold resummed form factors
• Threshold resummed spectra in B -> Xu l nu decays in NLO (II)
• Threshold Resummed Spectra in B -> Xu l nu Decays in NLO (I)
• Resummed B -> X_u l nu Decay Distributions to Next-to-Leading Order
• Note on the Extraction of |V_{ub}| using Radiative B Decays
• A two-loop relation between inclusive radiative and semileptonic B-decay spectra
• Threshold resummed spectra in B ->Xu l nu decays in NLO (III)
• Modelling non-perturbative corrections to bottom-quark fragmentation
• Radiative and semi-leptonic B-meson decay spectra: Sudakov resummation beyond logarithmic accuracy and the pole mass
• Measurements of Partial Branching Fractions for Bbar --> X_u ell nubar and Determination of |V_{ub}|
• Large |Vub|: A challenge for the Minimal Flavour Violating MSSM
• FPCP Theory Overview

Cited by in corpus (39)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• QCD and strongly coupled gauge theories: challenges and perspectives
• 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
• $B$- and $D$-meson leptonic decay constants from four-flavor lattice QCD
• Flavor Physics in the Quark Sector
• An Improved Standard Model Prediction Of BR(B -> tau nu) And Its Implications For New Physics
• Challenges in Semileptonic B Decays
• The CKM Parameters
• Study of Bbar --> Xu l nubar decays in BBbar events tagged by a fully reconstructed B-meson decay and determination of |V_{ub}|
• Semileptonic decays and $|V_{xb}|$ determinations
• Operator Product Expansion with analytic QCD in tau decay physics
• Measurements of Partial Branching Fractions of Inclusive $B\to X_u{\ell }^{+}{\nu }_{\ell }$ Decays with Hadronic Tagging
• Calculation of binding energies and masses of quarkonia in analytic QCD models
• $B\to \rho l\bar{\nu }$ and $\omega l\bar{\nu }$ in and beyond the Standard Model: Improved predictions and $|V_{ub}|$
• Precision Global Determination of the $B\to X_s\gamma$ Decay Rate
• NNVub: a Neural Network Approach to $B\to X_u\ell \nu$
• Semileptonic and leptonic $B$ decays, circa 2016
• A closer look at the extraction of $|V_{ub}|$ from $B\to \pi l\nu$
• Determination of the CKM matrix elements |V(xb)|
• Extractions of $|V_{ub}|/|V_{cb}|$ from a combined study of the exclusive $b\to u(c)\ell {\nu }_{\ell }$ decays
• Recent Developments on the CKM Matrix
• Brief review on semileptonic B decays
• Progress on semi-leptonic $B_{(s)}$ decays
• Third order correction to semileptonic $b\to u$ decay: fermionic contributions
• Status of $|V_{cb}|$ and $|V_{ub}|$ CKM matrix elements
• Experimental Status of the CKM Matrix
• A Review of the Magnitudes of the CKM Matrix Elements
• Charmless Semileptonic B Decays at e+e- Colliders
• Theory of Inclusive B Decays
• Theory of Semileptonic Charm Decays
• On the determination of |V_{ub}| from inclusive semileptonic B decays
• Measurement of the Ratio of Partial Branching Fractions of Inclusive $\overline{B}\to X_u\ell \overline{\nu }$ to $\overline{B}\to X_c\ell \overline{\nu }$ and the Ratio of their Spectra with Hadronic Tagging
• Semileptonic $B$ decays and $|V_{xb}|$ update
• Tensions in the flavour sector
• Recent progress in decays of $b$ and $c$ hadrons
• Semileptonic decays and the determination of |Vub|
• Anomalies in the heavy sector
• Inclusive semileptonic B decays: |V_{ub}| and |V_{cb}|