{"paper":{"title":"Uncertainty induced by QCD coupling in the CTEQ global analysis of parton distributions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"C.-P. Yuan, Daniel Stump, Hung-Liang Lai, Joey Huston, Jon Pumplin, Pavel Nadolsky, Zhao Li","submitted_at":"2010-04-26T19:55:49Z","abstract_excerpt":"We examine the dependence of parton distribution functions (PDFs) on the value of the QCD coupling strength $\\alpha_{s}(M_{Z})$. We explain a simple method that is rigorously valid in the quadratic approximation normally applied in PDF fitting, and fully reproduces the correlated dependence of theoretical cross sections on $\\alpha_s$ and PDF parameters. This method is based on a statistical relation that allows one to add the uncertainty produced by $\\alpha_s$, computed with some special PDF sets, in quadrature with the PDF uncertainty obtained for the fixed $\\alpha_s$ value (such as the CTEQ6"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1004.4624","kind":"arxiv","version":3},"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"}