Extracting $| V_{u b} |$ from $B \to π l ν$ decays using a multiply-subtracted Omnès dispersion relation

22 January 2007

journal article
Published by American Physical Society (APS) in Physical Review D

Vol. 75 (1)
https://doi.org/10.1103/physrevd.75.013008

Abstract

We use a multiply-subtracted Omnes dispersion relation for the form factor f^+ in B->pi semileptonic decay, allowing the direct input of experimental and theoretical information to constrain its dependence on q^2. Apart from these inputs we use only unitarity and analyticity properties. We obtain |V(ub)|=(4.02 \pm 0.35)\times 10^{-3}, improving the agreement with the value determined from inclusive methods, and competitive in precision with them.Comment: 10 pages, 4 figures. We include experimental data from BaBar (hep-ex/0607089). Approved for publication in PR

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This publication has 33 references indexed in Scilit:

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Extracting|Vub|fromB→πlνdecays using a multiply-subtracted Omnès dispersion relation

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Extracting $| V_{u b} |$ from $B \to π l ν$ decays using a multiply-subtracted Omnès dispersion relation