Study of the q^2-Dependence of B --> pi ell nu and B --> rho(omega)ell nu Decay and Extraction of |V_ub|

Abstract

We report on determinations of |Vub| resulting from studies of the branching fraction and q^2 distributions in exclusive semileptonic B decays that proceed via the b->u transition. Our data set consists of the 9.7x10^6 BBbar meson pairs collected at the Y(4S) resonance with the CLEO II detector. We measure B(B0 -> pi- l+ nu) = (1.33 +- 0.18 +- 0.11 +- 0.01 +- 0.07)x10^{-4} and B(B0 -> rho- l+ nu) = (2.17 +- 0.34 +0.47/-0.54 +- 0.41 +- 0.01)x10^{-4}, where the errors are statistical, experimental systematic, systematic due to residual form-factor uncertainties in the signal, and systematic due to residual form-factor uncertainties in the cross-feed modes, respectively. We also find B(B+ -> eta l+ nu) = (0.84 +- 0.31 +- 0.16 +- 0.09)x10^{-4}, consistent with what is expected from the B -> pi l nu mode and quark model symmetries. We extract |Vub| using Light-Cone Sum Rules (LCSR) for 0<= q^2<16 GeV^2 and Lattice QCD (LQCD) for 16 GeV^2 <= q^2 < q^2_max. Combining both intervals yields |Vub| = (3.24 +- 0.22 +- 0.13 +0.55/-0.39 +- 0.09)x10^{-3}$ for pi l nu, and |Vub| = (3.00 +- 0.21 +0.29/-0.35 +0.49/-0.38 +-0.28)x10^{-3} for rho l nu, where the errors are statistical, experimental systematic, theoretical, and signal form-factor shape, respectively. Our combined value from both decay modes is |Vub| = (3.17 +- 0.17 +0.16/-0.17 +0.53/-0.39 +-0.03)x10^{-3}.

45 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS, submitted to PRD

References in corpus (1)

• Measurement of the CKM Matrix Element |Vub| with B->rho e nu Decays

Cited by in corpus (60)

• Model-independent description of $B\to \pi l\nu$ decays and a determination of $|V_{ub}|$
• Charmless $B\to PP$ decays using flavor SU(3) symmetry
• B Meson Semileptonic Form Factors from Unquenched Lattice QCD
• Resolution to the B -> pi K puzzle
• Comment on form factor shape and extraction of |V_ub| from B --> pi l nu
• B_l4 decays and the extraction of |V_ub|
• Study of B --> pi l nu and B --> rho l nu Decays and Determination of |V_ub|
• Study of Exclusive B->X_u l nu Decays and Extraction of |V_{ub}| using Full Reconstruction Tagging at the Belle Experiment
• Semileptonic D->pi/K and B->pi/D decays in 2+1 flavor lattice QCD
• A Precision Model Independent Determination of |Vub| from B -> pi e nu
• Measurement of the decay $B^0\to {\pi }^{-}{\ell }^{+}\nu$ and determination of $|V_{ub}|$
• eta - eta prime Mixing -From electromagnetic transitions to weak decays of charm and beauty hadrons
• New Physics at a Super Flavor Factory
• |V_ub| and Constraints on the Leading-Twist Pion Distribution Amplitude from B->pi l nu
• Light-cone sum rules in soft-collinear effective theory
• Measurement of the B0 --> pi l nu Form-Factor Shape and Branching Fraction, and Determination of |Vub| with a Loose Neutrino Reconstruction Technique
• Heavy Quarks and Lattice QCD
• Two-Body Charmless B Decays Involving eta and eta'
• Measurements of branching fractions and $q^2$ distributions for $B\to \pi \ell \nu$ and $B\to \rho \ell \nu$ Decays with $B\to D^{(\ast )}\ell \nu$ Decay Tagging
• A Study of Exclusive Charmless Semileptonic B Decay and |V_ub|
• Recent results from lattice calculations
• New analysis of semileptonic B decays in the relativistic quark model
• |V_ub| from UTangles and B->pi l nu
• Measurement of the Inclusive Charmless Semileptonic Branching Ratio of B Mesons and Determination of |V_ub|
• Constraining the Unitarity Triangle with B -> V gamma
• Measurement of the B^0 --> pi^-ell^+nu and B^+ --> eta^(')ell^+nu Branching Fractions, the B^0 --> pi^-ell^+nu and B^+ --> eta ell^+nu Form-Factor Shapes, and Determination of |V_{ub}|
• Measurement of the B-Meson Inclusive Semileptonic Branching Fraction and Electron-Energy Moments
• Charmless decays B->pipi, piK and KK in broken SU(3)symmetry
• Study of B --> pi l nu and B --> rho l nu decays and determination of |Vub|
• Heavy-to-light meson form factors at large recoil
• Measurement of the B -> pi l nu Branching Fraction and Determination of |Vub| with Tagged B Mesons
• A Study of the Semileptonic Charm Decays D^0 --> pi^- e^+ nu_e, D^+ --> pi^0 e^+ nu_e, D^0 --> K^- e^+ nu_e, and D^+ --> barK^0 e^+ nu_e
• B to rho ell nu form factors in lattice QCD
• Semileptonic B Decays with Nf=2+1 Dynamical Quarks
• Semileptonic $B\to \pi$ Decays from an Omnès Improved Nonrelativistic Constituent Quark Model
• |Vub| from exclusive semileptonic B to pi decays revisited
• Moving NRQCD for heavy-to-light form factors on the lattice
• Extracting |V(ub)| from B->pi l nu Decays Using a Multiply-subtracted Omnes Dispersion Relation
• Evidence for $B^{+}\to \omega l^{+}\nu$
• Experimental Limits on Weak Annihilation Contributions to b -->u ell nu Decay
• A Study of Exclusive Charmless Semileptonic B Decays and Extraction of |V_{ub}| at CLEO
• |Vub| from Exclusive Semileptonic B--> rho Decays
• Study of the exclusive $b\to u{\ell }^{-}{\bar{\nu }}_{\ell }$ decays in the MSSM with and without R-parity violation
• |Vub| from Exclusive Semileptonic B to pi Decays
• Status of Lattice Flavor Physics
• A model independent determination of $|V_{ub}|$ using the global $q^2$ dependence of the dispersive bounds on the $B\to \pi l\nu$ form factors
• A Study of the Decays D^0 --> pi^- e^+ nu_e, D^0 --> K^- e^+ nu_e, D^+ --> pi^0 e^+ nu_e, and D^+ --> barK^0 e^+ nu_e
• Heavy-to-light scalar form factors from Muskhelishvili-Omnès dispersion relations
• Factorization in exclusive semileptonic radiative B decays
• Determination of the strong coupling $g_{B^{\ast }B\pi }$ from semi-leptonic $B\to \pi \ell \nu$ decay
• Study of $B\to \pi \ell {\nu }_{\ell }$ and $B^{+}\to {\eta }^{(\prime )}{\ell }^{+}{\nu }_{\ell }$ decays and determination of $|V_{ub}|$
• The factorizable amplitude in $B^0\to {\pi }^{+}{\pi }^{-}$
• B Physics on the Lattice: Present and Future
• The phenomenology of rare and semileptonic B decays
• Determination of |Vub|
• Testing the chirality of b to u current with B^0 \to ρ^ - \ell^+ ν
• CKM Parameters and Rare B Decays
• B meson semileptonic decays
• Semileptonic B Decays and Determination of |Vub|
• B Decays on the Lattice and Results for Phenomenology