{"paper":{"title":"High precision determination of the $Q^2$-evolution of the Bjorken Sum","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"nucl-ex","authors_text":"A. Deur, D. Crabb, F.-X. Girod, K. A. Griffioen, N. Guler, N. Kvaltine, S. E. Kuhn, V. Burkert, Y. Prok","submitted_at":"2014-05-30T13:21:26Z","abstract_excerpt":"We present a significantly improved determination of the Bjorken Sum for 0.6$\\leq Q^{2}\\leq$4.8 GeV$^{2}$ using precise new $g_{1}^{p}$ and $g_{1}^{d}$ data taken with the CLAS detector at Jefferson Lab. A higher-twist analysis of the $Q^{2}$-dependence of the Bjorken Sum yields the twist-4 coefficient $f_{2}^{p-n}=-0.064 \\pm0.009\\pm_{0.036}^{0.032}$. This leads to the color polarizabilities $\\chi_{E}^{p-n}=-0.032\\pm0.024$ and $\\chi_{B}^{p-n}=0.032\\pm0.013$. The strong force coupling is determined to be $\\alpha_{s}^{\\overline{\\mbox{ MS}}}(M_{Z}^{2})=0.1124\\pm0.0061$, which has an uncertainty a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1405.7854","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"}