{"paper":{"title":"The role of Delta(1700) excitation and rho production in double pion photoproduction","license":"","headline":"","cross_cats":[],"primary_cat":"nucl-th","authors_text":"E. Oset, J.C. Nacher, L. Roca (Valencia U.), M.J. Vicente Vacas","submitted_at":"2000-12-18T15:28:39Z","abstract_excerpt":"Recent information on invariant mass distributions of the $\\gamma p\\to\\pi^+\\pi^0 n$ reaction, where previous theoretical models had shown deficiencies, have made more evident the need for new mechanisms, so far neglected or inaccurately included. We have updated a previous model to include new necessary mechanisms. We find that the production of the $\\rho$ meson, and the $\\Delta(1700)$ excitation, through interference with the dominant terms, are important mechanisms that solve the puzzle of the $\\gamma p\\to\\pi^+\\pi^0 n$ reaction without spoiling the early agreement with the $\\gamma p\\to\\pi^+\\"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"nucl-th/0012065","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"}