{"paper":{"title":"Sigma-Meson and Confinement Singularity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"A.V. Anisovich, A.V. Sarantsev, J. Nyiri, K.V. Nikonov, M.A. Matveev, T.O. Vulfs, V.A. Nikonov, V.V. Anisovich","submitted_at":"2011-05-30T10:10:47Z","abstract_excerpt":"We describe the meson-meson data for the ($IJ^{PC}=00^{++}$) wave at $280\\leq\\sqrt s\\leq 1900$ MeV in two approaches: (i) the K-matrix approach and (ii) the dispersion relation D-matrix method. With a good description of low energy data (at $280\\leq\\sqrt s\\leq 900$ MeV) as well as the data of two-meson transition amplitudes and antiproton-proton annihilation into three pseudoscalar meson states (at $450\\leq\\sqrt s\\leq 1950$ MeV) we have found the positions of the resonance poles: (i) for the $\\sigma$ meson pole: $M_\\sigma = (390\\pm 35)-i(235\\pm 50)$ MeV; (ii) two poles for the $f_0(980)$, on t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1105.5923","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"}