{"arxiv_id":"hep-ph/9711248","title":"Comment on $V_{ub}$ from Exclusive Semileptonic B and D Decays","abstract":"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%.","primary_cat":"hep-ph","cross_cats":[],"submitted_at":"1997-11-06T06:04:20+00:00","latest_version":2,"source":"arxiv","source_label":"arXiv","source_url":null,"has_pdf":true,"has_source":false,"verdict":null,"confidence":null,"one_line_summary":null,"novelty_score":null,"correctness_risk":null,"formal_verification":null,"upvotes":0,"downvotes":0,"pith_score":0,"inbound_count":2,"_links":{"html":"https://pith.science/paper/hep-ph/9711248","verdict":"/api/v1/verdicts/hep-ph/9711248"}}