{"paper":{"title":"Phenomenological analysis of the double pion production in nucleon-nucleon collisions up to 2.2 GeV","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-th","authors_text":"Bing-Song Zou, Hu-Shan Xu, Xu Cao","submitted_at":"2010-04-01T14:10:06Z","abstract_excerpt":"With an effective Lagrangian approach, we analyze several NN \\to NN\\pi\\pi channels by including various resonances with mass up to 1.72 GeV. For the channels with the pion pair of isospin zero, we confirm the dominance of N*(1440)\\to N\\sigma in the near threshold region. At higher energies and for channels with the final pion pair of isospin one, we find large contributions from N*(1440)\\to \\Delta\\pi, double-Delta, \\Delta(1600) \\to N*(1440)\\pi, \\Delta(1600) \\to \\Delta\\pi and \\Delta(1620) \\to \\Delta\\pi. There are also sizeable contributions from \\Delta \\to \\Delta\\pi, \\Delta \\to N\\pi, N \\to \\Del"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1004.0140","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"}