{"paper":{"title":"Implications of the $B \\to X \\ell \\bar\\nu_\\ell$ lepton spectrum for heavy quark physics","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Anton Kapustin, Mark B. Wise, Martin Gremm, Zoltan Ligeti","submitted_at":"1996-03-14T18:55:58Z","abstract_excerpt":"The shape of the lepton spectrum in inclusive semileptonic $B\\to X\\,\\ell\\,\\bar\\nu_\\ell$ decay is sensitive to matrix elements of the heavy quark effective theory, $\\bar\\Lambda$ and $\\lambda_1$. From CLEO data we extract $\\bar\\Lambda=0.39\\pm0.11\\,$GeV and $\\lambda_1=-0.19\\pm0.10\\,{\\rm GeV}^2$, where the uncertainty is the $1\\sigma$ statistical error only. Systematic uncertainties are discussed. These values for $\\bar\\Lambda$ and $\\lambda_1$ are used to determine $|V_{cb}|$ and the $\\overline{\\rm MS}$ bottom and charm quark masses. We discuss the theoretical uncertainties related to order $(\\Lam"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9603314","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"}