{"paper":{"title":"Semileptonic $B^{-}\\to\\pi^{+}\\pi^{-}\\ell^{-}\\bar\\nu_\\ell$ decay with $\\pi\\pi$ invariant mass spectrum","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Shang-Yuu Tsai, Yu-Kuo Hsiao","submitted_at":"2021-07-08T06:59:29Z","abstract_excerpt":"BELLE has recently reported the measurement of the branching fraction of the semileptonic $B^{-}\\to\\pi^{+}\\pi^{-}\\ell^{-}\\bar\\nu_\\ell$ decay, where $\\ell$ represents an electron or a muon. With the new information on the $\\pi\\pi$ invariant mass spectrum, we extract $|V_{ub}|=(3.31\\pm 0.61)\\times 10^{-3}$ in agreement with those from the other exclusive $B$ decays. In particular, we determine the non-resonant $B\\to\\pi\\pi$ transition form factors, and predict the non-resonant branching fraction ${\\cal B}(B^{-}\\to\\pi^{+}\\pi^{-}\\ell^{-}\\bar\\nu_\\ell)=(3.5\\pm 1.4^{+4.3}_{-2.4})\\times 10^{-5}$, which"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.03634","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2107.03634/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}