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An analytic estimate of the (physical) slope to two loops within QSSR leads to the accurate value $\\xi'(vv'=1) \\simeq -(1.00 \\pm 0.02)$ due to the (almost) complete cancellations between the perturbative and non-perturbative corrections at the stability points. Then, we deduce, from the present data, the improved estimate $\\vert V_{cb} \\vert \\simeq \\ga 1.48 \\mbox{ps}/\\tau_B \\dr ^{1/2}(37.3 "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"hep-ph/9403253","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-ph","submitted_at":"1994-03-09T17:43:02Z","cross_cats_sorted":[],"title_canon_sha256":"f8d595b08018648a7535816648cf80dcf891d5b1237438385565274e4f47e7cc","abstract_canon_sha256":"d94362b2c1da5e40cc21c0ddf908f4d56625b04148d84484f2ed1a508d3f39ca"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:37:45.713527Z","signature_b64":"RGuLGbl5uMuN6XzDZNujjdcBKTgvnVPadbF/Z6+NoOuYBh0M98wmqL+Ahe5Bn049BVbL7GKE2mlY/QsZax3DAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c4e48228e680a7aa29c210953d9d3455460876297b4cd6ef27b700fd516963be","last_reissued_at":"2026-05-18T04:37:45.713008Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:37:45.713008Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Upsilon \\bar BB$ Couplings, Slope of the Isgur-Wise Function and Improved Estimate of \\boldmath{$V_{cb}$}}","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"S. Narison","submitted_at":"1994-03-09T17:43:02Z","abstract_excerpt":"We estimate the sum of the $\\Upsilon \\bar BB $ couplings using QCD Spectral Sum Rules (QSSR). Our result implies the phenomenological bound $\\xi'(vv'=1) \\geq -1.04$ for the slope of the Isgur-Wise function. An analytic estimate of the (physical) slope to two loops within QSSR leads to the accurate value $\\xi'(vv'=1) \\simeq -(1.00 \\pm 0.02)$ due to the (almost) complete cancellations between the perturbative and non-perturbative corrections at the stability points. Then, we deduce, from the present data, the improved estimate $\\vert V_{cb} \\vert \\simeq \\ga 1.48 \\mbox{ps}/\\tau_B \\dr ^{1/2}(37.3 "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9403253","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"hep-ph/9403253","created_at":"2026-05-18T04:37:45.713084+00:00"},{"alias_kind":"arxiv_version","alias_value":"hep-ph/9403253v1","created_at":"2026-05-18T04:37:45.713084+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-ph/9403253","created_at":"2026-05-18T04:37:45.713084+00:00"},{"alias_kind":"pith_short_12","alias_value":"YTSIEKHGQCT2","created_at":"2026-05-18T12:25:47.102015+00:00"},{"alias_kind":"pith_short_16","alias_value":"YTSIEKHGQCT2UKOC","created_at":"2026-05-18T12:25:47.102015+00:00"},{"alias_kind":"pith_short_8","alias_value":"YTSIEKHG","created_at":"2026-05-18T12:25:47.102015+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/YTSIEKHGQCT2UKOCCCKT3HJUKV","json":"https://pith.science/pith/YTSIEKHGQCT2UKOCCCKT3HJUKV.json","graph_json":"https://pith.science/api/pith-number/YTSIEKHGQCT2UKOCCCKT3HJUKV/graph.json","events_json":"https://pith.science/api/pith-number/YTSIEKHGQCT2UKOCCCKT3HJUKV/events.json","paper":"https://pith.science/paper/YTSIEKHG"},"agent_actions":{"view_html":"https://pith.science/pith/YTSIEKHGQCT2UKOCCCKT3HJUKV","download_json":"https://pith.science/pith/YTSIEKHGQCT2UKOCCCKT3HJUKV.json","view_paper":"https://pith.science/paper/YTSIEKHG","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=hep-ph/9403253&json=true","fetch_graph":"https://pith.science/api/pith-number/YTSIEKHGQCT2UKOCCCKT3HJUKV/graph.json","fetch_events":"https://pith.science/api/pith-number/YTSIEKHGQCT2UKOCCCKT3HJUKV/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/YTSIEKHGQCT2UKOCCCKT3HJUKV/action/timestamp_anchor","attest_storage":"https://pith.science/pith/YTSIEKHGQCT2UKOCCCKT3HJUKV/action/storage_attestation","attest_author":"https://pith.science/pith/YTSIEKHGQCT2UKOCCCKT3HJUKV/action/author_attestation","sign_citation":"https://pith.science/pith/YTSIEKHGQCT2UKOCCCKT3HJUKV/action/citation_signature","submit_replication":"https://pith.science/pith/YTSIEKHGQCT2UKOCCCKT3HJUKV/action/replication_record"}},"created_at":"2026-05-18T04:37:45.713084+00:00","updated_at":"2026-05-18T04:37:45.713084+00:00"}