{"paper":{"title":"Determining alpha_s from the hyperfine splitting mUpsilon(1S)-mEta(b)","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Egidio Scrimieri, Pietro Colangelo, Pietro Santorelli","submitted_at":"2009-12-07T16:57:57Z","abstract_excerpt":"The measurement of the eta_b mass, together with a QCD result for the hyperfine splitting E_{HFS}=M_{Upsilon(1S)}-M_{eta_b}, allows us to determine the strong coupling constant alpha_s at a low energy scale. The result alpha_s(M_{Upsilon(1S)})=0.197\\pm 0.002_{Delta E_{HFS}^{exp}} \\pm 0.002_{scheme} \\pm 0.002_{delta <G^2>} \\pm 0.006_{delta m_b} \\pm 0.005_{ho}, alpha_s(M_{Z^0})=0.124\\pm 0.001_{Delta E_{HFS}^{exp}} \\pm 0.001_{scheme} \\pm 0.001_{delta <G^2>} \\pm 0.003_{delta m_b} \\pm 0.002_{ho}, is compatible with the current world average of alpha_s reported by the Particle Data Group, and shows "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0912.1081","kind":"arxiv","version":2},"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"}