{"paper":{"title":"Observation of $\\overline{B} \\to D^{(*)} \\pi^+\\pi^- \\ell^-\\overline{\\nu}$ decays in $e^+e^-$ collisions at the $\\Upsilon(4S)$ resonance","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"The BABAR Collaboration","submitted_at":"2015-07-29T20:26:55Z","abstract_excerpt":"We report on measurements of the decays of $\\overline{B}$ mesons into the semileptonic final states $\\overline{B} \\to D^{(*)} \\pi^+\\pi^- \\ell^-\\overline{\\nu}$, where $D^{(*)}$ represents a $D$ or $D^*$ meson and $\\ell^-$ is an electron or a muon. These measurements are based on $471\\times 10^6$ $B\\overline{B}$ pairs recorded with the $BABAR$ detector at the SLAC asymmetric $B$ Factory PEP-II. We determine the branching fraction ratios $R^{(*)}_{\\pi^+\\pi^-} = \\mathcal{B}(\\overline{B} \\to D^{(*)} \\pi^+\\pi^- \\ell^- \\overline{\\nu})/\\mathcal{B}(\\overline{B} \\to D^{(*)} \\ell^-\\overline{\\nu})$ using "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.08303","kind":"arxiv","version":1},"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"}