{"paper":{"title":"Perturbative QCD fitting of KEDR and BESIII $e^+e^-$ data for R(s) and $\\alpha_s$ determination","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Fits of KEDR and BESIII R(s) data to perturbative QCD show α_s(M_Z) increasing with truncation order up to 0.1312","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"A.L.Kataev (INR RAS, BLTP JINR), K.Yu.Todyshev (Budker INP RAS, Novosibirsk State University)","submitted_at":"2026-03-31T14:32:56Z","abstract_excerpt":"The experimental data collected by KEDR and BESIII collaborations at the energies below charm quark thresholds are compared with the massless QCD expressions for the $e^+e^-$ annihilation R-ratio truncated at different orders of perturbation theory. The fits demonstrate the dependence of the extracted $\\alpha_s(M_Z)$ values on the orders of truncation of the corresponding approximations. The next-to-leading order, next-to-next-to-leading order and next-to-next-to-next-to-leading order fits of the combined KEDR data and BESIII data , truncated at the scale of mass of $J/\\Psi$ meson, give the fo"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"The next-to-leading order, next-to-next-to-leading order and next-to-next-to-next-to-leading order fits of the combined KEDR data and BESIII data, truncated at the mass scale of J/Ψ meson, give α_s(M_Z)=0.1179^{+0.0051}_{-0.0069}, α_s(M_Z)=0.1221^{+0.0063}_{-0.0080} and α_s(M_Z)=0.1312^{+0.0027}_{-0.0067}.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That fixed-order perturbative QCD expressions, after analytical continuation, accurately describe the measured R(s) data below charm threshold with negligible non-perturbative contributions.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Combined fits of KEDR and BESIII R(s) data yield alpha_s(M_Z) = 0.1179, 0.1221, and 0.1312 at NLO, NNLO, and NNNLO, demonstrating strong dependence on perturbative truncation order.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Fits of KEDR and BESIII R(s) data to perturbative QCD show α_s(M_Z) increasing with truncation order up to 0.1312","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"f158320f756b8530e6310add1b198b811fd60724d57b712b024d86c02aaddb6b"},"source":{"id":"2603.29803","kind":"arxiv","version":3},"verdict":{"id":"169cd4ae-8001-4d72-8ff2-afa6ec845e1d","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-13T23:16:06.778217Z","strongest_claim":"The next-to-leading order, next-to-next-to-leading order and next-to-next-to-next-to-leading order fits of the combined KEDR data and BESIII data, truncated at the mass scale of J/Ψ meson, give α_s(M_Z)=0.1179^{+0.0051}_{-0.0069}, α_s(M_Z)=0.1221^{+0.0063}_{-0.0080} and α_s(M_Z)=0.1312^{+0.0027}_{-0.0067}.","one_line_summary":"Combined fits of KEDR and BESIII R(s) data yield alpha_s(M_Z) = 0.1179, 0.1221, and 0.1312 at NLO, NNLO, and NNNLO, demonstrating strong dependence on perturbative truncation order.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That fixed-order perturbative QCD expressions, after analytical continuation, accurately describe the measured R(s) data below charm threshold with negligible non-perturbative contributions.","pith_extraction_headline":"Fits of KEDR and BESIII R(s) data to perturbative QCD show α_s(M_Z) increasing with truncation order up to 0.1312"},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2603.29803/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":2,"snapshot_sha256":"4f6d1d6a8addf63c6984bd12e6133c03714bfcfcd59189bde38e88fc69df45b4"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}