{"paper":{"title":"Enhanced subleading structure functions in semileptonic B decay","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Adam K. Leibovich, Mark B. Wise, Zoltan Ligeti","submitted_at":"2002-05-15T17:01:20Z","abstract_excerpt":"The charged lepton spectrum in semileptonic $B\\to X_u \\ell\\bar\\nu$ decay near maximal lepton energy receives important corrections from subleading structure functions that are formally suppressed by powers of $\\Lambda_{QCD}/m_b$ but are enhanced by numerical factors. We investigate the series of higher order terms which smear over a region of width $\\Delta E_\\ell \\sim \\Lambda_{QCD}$ near the endpoint the contributions proportional to $\\delta(E_\\ell - m_b/2)$ times (i) the matrix element of the chromomagnetic operator, and (ii) four-quark operators. These contribute to the total rate at the few"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0205148","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"}