A Study of Exclusive Charmless Semileptonic B Decay and |V_ub|

Abstract

We study semileptonic B decay to the exclusive charmless states pi, rho/omega, eta and eta' using the 16 fb-1 CLEO Upsilon(4S) data sample. We find B(B^0 -> pi^-l^+nu) = (1.37 +- 0.15_stat +- 0.11_sys) x 10^-4 and B(B^0 -> rho^- l^+ nu) = (2.93 +- 0.37_stat +- 0.37_sys) x 10^-4, and find evidence for B^+ -> eta' l^+ nu, with B(B^+ -> eta' l^+ nu) = (2.66 +- 0.80_stat +- 0.56_sys ) x 10^-4. From our B -> pi l nu rate for q^2 > 16 GeV^2 and lattice QCD we find |V_{ub}| = (3.6 +- 0.4_stat +- 0.2_syst +0.6-0.4_thy) x 10^-3.

9 pages, 2 figures; revised

References in corpus (8)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The Cosmological Parameters 2006
• 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)
• B Meson Semileptonic Form Factors from Unquenched Lattice QCD
• Measurement of the B0 --> pi l nu Form-Factor Shape and Branching Fraction, and Determination of |Vub| with a Loose Neutrino Reconstruction Technique
• 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
• Measurement of the B -> pi l nu Branching Fraction and Determination of |Vub| with Tagged B Mesons
• Experimental Limits on Weak Annihilation Contributions to b -->u ell nu Decay

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