|Vub| from Exclusive Semileptonic B to pi Decays

Abstract

We use Omnes representations of the form factors f_+ and f_0 for exclusive semileptonic B to pi decays, paying special attention to the treatment of the B* pole and its effect on f_+. We apply them to combine experimental partial branching fraction information with theoretical calculations of both form factors to extract |Vub|. The precision we achieve is competitive with the inclusive determination and we do not find a significant discrepancy between our result, |Vub| =(3.90+/-0.32+/-0.18)10^(-3), and the inclusive world average value, (4.45+/-0.20+/-0.26)10^(-3).

arXiv comment10 pages, Latex, 2 figures; version accepted for publication

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Cited by in corpus (12)

• Model-independent description of $B\to \pi l\nu$ decays and a determination of $|V_{ub}|$
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• Two-pole structure of the $D_0^{\ast }(2400)$
• B->eta(') Form Factors in QCD
• Two-loop Corrections to the B to pi Form Factor from QCD Sum Rules on the Light-Cone and |V(ub)|
• |Vub| from exclusive semileptonic B to pi decays revisited
• |Vub| from Exclusive Semileptonic B--> rho Decays
• ${\bar{B}}_s\to K$ semileptonic decay from an Omnès improved constituent quark model
• Heavy-to-light scalar form factors from Muskhelishvili-Omnès dispersion relations
• Study of $B\to \pi \ell {\nu }_{\ell }$ and $B^{+}\to {\eta }^{(\prime )}{\ell }^{+}{\nu }_{\ell }$ decays and determination of $|V_{ub}|$
• $B_s$ mesons: semileptonic and nonleptonic decays
• Constraints on B--->pi,K transition form factors from exclusive semileptonic D-meson decays