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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"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"hep-ph/9401226","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-ph","submitted_at":"1994-01-10T11:49:05Z","cross_cats_sorted":[],"title_canon_sha256":"7813d4fc2cc2d10661a4bcf8f7926fa99fb25145d118f501f65d7e5a672043ea","abstract_canon_sha256":"1880c32c8d8cd551a2407be2c3905639ae82e704c46bfc898070b07a8ef7d932"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:30:37.912441Z","signature_b64":"8wu6Arvv8AlNm4asaf/Jo8/X5yru5VwQ1tUaIabhw3VYGIUzLo2Il7Lg+ZxQXGyMo6SmiToC4aAOjxJPNQvEBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ff8201b592d59a517592491f40f80e9e7547730b4536dcef710d972f6610419d","last_reissued_at":"2026-05-18T04:30:37.911431Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:30:37.911431Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"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. 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