{"paper":{"title":"$B\\to \\rho$ semileptonic decays and $|V_{ub}|$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"C. Albertus, E. Hern\\'andez, J. Nieves","submitted_at":"2014-06-30T15:52:29Z","abstract_excerpt":"We reevaluate the $B\\to\\rho\\,l^+\\nu_l$ decay width as a full $B\\to\\pi\\pi\\,l^+\\nu_l$ four-particle decay, in which the two final pions are produced via an intermediate $\\rho$ meson. The decay width can be written as a convolution of the $B\\to\\rho\\,l^+\\nu_l$ decay width, for an off-shell $\\rho$, with the $\\rho\\to\\pi\\pi$ line shape. This allows to fully incorporate the effects of the finite $\\rho$ meson width. As shown, consideration of the $\\rho$ meson width effects increase the $|V_{ub}|$ value by some 8%, rendering it in better agreement with the determination based in the $B\\to\\pi$ decay. We "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1406.7782","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}