Comment on Vub from exclusive semileptonic B and D decays |
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Authors: | Zoltan Ligeti Iain W Stewart Mark B Wise |
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Abstract: | The prospects for determining |Vub| from exclusive B semileptonic decay are discussed. The double ratio of form factors (f(B→ρ)/f(B→K*))/(f(D→ρ)/f(D→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
,
and
can lead to a model independent determination of |Vub| with an uncertainty from theory of about 10%. |
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