Comment on $V_{ub}$ from Exclusive Semileptonic B and D Decays

Details Comment on $V_{ub}$ from Exclusive Semileptonic B and D Decays Comment on $V_{ub}$ from Exclusive Semileptonic B and D Decays

1997-11-06

arxiv.org/abs/hep-ph/9711248v2

Phys.Lett.B420:359-366,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 3 figs, minor typos corrected, to appear in Phys. Lett. B

Scientific paper

10.1016/S0370-2693(97)01518-9

The prospects for determining $|V_{ub}|$ from exclusive B semileptonic decay are discussed. The double ratio of form factors $(f^{B\to\rho}/f^{B\to K^*})/ (f^{D\to\rho}/f^{D\to K^*})$ is calculated using chiral perturbation theory. Its deviation from unity due to contributions that are non-analytic in the symmetry breaking parameters is very small. Combining experimental data obtainable from (B->rho l nu), (B->K* l l) and (D->rho l nu) can lead to a model independent determination of $|V_{ub}|$ with an uncertainty from theory of about 10%.

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