{"paper":{"title":"Scaling in $\\gamma^* p$ total cross sections, saturation and the gluon density","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"B. Surrow, D. Schildknecht, M. Tentyukov","submitted_at":"2001-07-16T17:52:05Z","abstract_excerpt":"Including the new HERA data, the $\\gamma^* p$ total cross section is analysed in the generalized vector dominance/colour-dipole picture (GVD/CDP) that contains scaling in $\\eta = (Q^2 + m^2_0) / \\Lambda^2 (W^2)$, where $\\Lambda^2 (W^2)$ is an increasing function of $W^2$.\n  At any $Q^2$, for $W^2 \\to \\infty$, the cross sections for virtual and real photons become identical, $\\sigma_{\\gamma^* p} (W^2, Q^2) / \\sigma_{\\gamma p} (W^2) \\to 1$. The gluon density deduced from the colour-dipole cross section fulfills the leading order DGLAP relationship. Evolution \\`a la DGLAP breaks down for $\\eta \\l"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0107178","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/hep-ph/0107178/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}