{"paper":{"title":"Higher twists in spin structure functions from a \"constituent quark\" point of view","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"A. V. Sidorov, C. Weiss","submitted_at":"2004-10-19T14:06:13Z","abstract_excerpt":"We discuss the implications of a \"constituent quark\" structure of the nucleon for the leading (1/Q^2-) power corrections to the spin structure functions. Our basic assumption is the presence of quark-gluon correlations in the nucleon wave function, whose size, rho ~ 0.3 fm, is small compared to the nucleon radius, R (two-scale picture). We argue that in this picture the isovector twist-4 matrix element in the proton has a sizable negative value, M_N^2 |f_2^{u - d}| ~ rho^{-2}, while the twist-3 matrix elements are small, M_N^2 d_2 ~ R^{-2}. These findings are in agreement with the result of a "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0410253","kind":"arxiv","version":1},"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"}