{"paper":{"title":"The ratio $R={\\rm d}\\sigma_L/{\\rm d}\\sigma_T$ in heavy-quark pair leptoproduction as a probe of linearly polarized gluons in unpolarized proton","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"A.V. Efremov, N.Ya. Ivanov, O.V. Teryaev","submitted_at":"2018-01-08T19:14:42Z","abstract_excerpt":"We study the Callan-Gross ratio $R={\\rm d}\\sigma_L/{\\rm d}\\sigma_T$ in heavy-quark pair leptoproduction, $lN\\rightarrow l^{\\prime}Q\\bar{Q}X$, as a probe of linearly polarized gluons inside unpolarized proton, where ${\\rm d}\\sigma_T$ (${\\rm d}\\sigma_L$) is the differential cross section of the $\\gamma^*N\\rightarrow Q\\bar{Q}X$ process initiated by a transverse (longitudinal) virtual photon. Note first that the maximal value for the quantity $R$ allowed by the photon-gluon fusion with unpolarized gluons is large, about 2. We calculate the contribution of the transverse-momentum dependent gluonic "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.03398","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"}