{"paper":{"title":"\\sigma-Particle in Production Processes","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Kunio Takamatsu, Muneyuki Ishida, Shin Ishida, Taku Ishida, Tsuneaki Tsuru","submitted_at":"1997-12-02T02:25:09Z","abstract_excerpt":"A S-wave \\pi\\pi resonance below 1 GeV/c^2, sigma has been observed in analyses of the phase shift data of \\pi\\pi scatterings. It is important to observe it in production processes. A huge events of \\pi^0\\pi^0 below 1 GeV/c^2 is seen in the central production of the GAMS experiment. Its mass spectrum is well described by the variant mass and width method (VMW) including f_0(980), f_2(1270) and a S-wave resonance which might be assigned to be a sigma. We report here that the angular distributions of the \\pi^0\\pi^0 system are also described with the S-wave resonance interfering with f_0(980) and "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9712232","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"}