{"paper":{"title":"Isospin breaking decay $\\eta(1405) \\to f_0(980)\\pi^0 \\to 3\\pi$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex","nucl-th"],"primary_cat":"hep-ph","authors_text":"A.A. Kozhevnikov, G.N. Shestakov, N.N. Achasov","submitted_at":"2015-04-11T06:41:04Z","abstract_excerpt":"There are attempts in the literature to theoretically explain the large breaking of isotopic invariance in the decay $\\eta(1405)$\\,$\\to$\\,$f_0(980)\\pi^0$\\,$\\to$\\,$ 3\\pi$ by the mechanism containing the logarithmic (triangle) singularity, i.e., as being due to the transition $\\eta(1405)\\to(K^*\\bar K+\\bar K^*K)\\to(K^+K^-+K^0\\bar K^0)\\pi^0\\to f_0(980)\\pi^0\\to3\\pi$. The corresponding calculations were fulfilled for a hypothetic case of the stable $K^*$ meson. Here, we show that the account of the finite width of the $K^*$ ($\\Gamma_{K^*\\to K\\pi}\\approx50$ MeV) smoothes the logarithmic singularities"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.02844","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"}