{"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"}