{"paper":{"title":"Heavy Quark Expansion for the Inclusive Decay $\\bar B\\to\\tau\\,\\bar\\nu\\,X$","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Adam F. Falk, Matthias Neubert, Yosef Nir, Zoltan Ligeti","submitted_at":"1994-01-10T11:49:05Z","abstract_excerpt":"We calculate the differential decay rate for inclusive $\\bar B\\to\\tau\\,\\bar\\nu\\,X$ transitions to order $1/m_b^2$ in the heavy quark expansion, for both polarized and unpolarized tau leptons. We show that using a systematic $1/m_b$ expansion significantly reduces the theoretical uncertainties in the calculation. We obtain for the total branching ratio ${\\rm BR}(\\bar B\\to\\tau\\,\\bar\\nu\\,X)=2.30\\pm 0.25\\%$, and for the tau polarization $A_{\\rm pol}=-0.706\\pm0.006$. {}From the experimental measurement of the branching ratio at LEP, we derive the upper bound $\\lo\\leq 0.8\\gev^2$ for one of the param"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9401226","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"}