{"paper":{"title":"Impact of the heavy quark matching scales in PDF fits","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"A. Cooper-Sarkar, A. Geiser, A. Glazov, A. Kusina, A. Luszczak, D. Britzger, E. Godat, F. Giuli, F. Lyonnet, F. Olness, I. Schienbein, O. Zenaiev, R. Placakyte, S. Camarda, The xFitter Developers Team: V. Bertone, V. Radescu","submitted_at":"2017-07-17T18:08:33Z","abstract_excerpt":"We investigate the impact of displaced heavy quark matching scales in a global fit. The heavy quark matching scale $\\mu_{m}$ determines at which energy scale $\\mu$ the QCD theory transitions from $N_{F}$ to $N_{F}+1$ in the Variable Flavor Number Scheme (VFNS) for the evolution of the Parton Distribution Functions (PDFs) and strong coupling $\\alpha_S(\\mu)$. We study the variation of the matching scales, and their impact on a global PDF fit of the combined HERA data. As the choice of the matching scale $\\mu_{m}$ effectively is a choice of scheme, this represents a theoretical uncertainty; ideal"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.05343","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"}