{"paper":{"title":"Isotopic Symmetry Breaking in the $\\eta(1405)\\to f_0 (980)\\pi^0\\to\\pi^+\\pi^-\\pi^0$. Decay through a $K\\bar K$ Loop Diagram and the Role of Anomalous Landau Thresholds","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex","nucl-th"],"primary_cat":"hep-ph","authors_text":"G.N. Shestakov, N.N. Achasov","submitted_at":"2018-04-28T06:27:04Z","abstract_excerpt":"Anomalous isotopic symmetry breaking in the $\\eta(1405)\\to f_0(980)\\pi^0\\to\\pi^+\\pi^-\\pi^0$ decay through a mechanism featuring anomalous Landau thresholds in the form of logarithmic triangle singularities, i.e., through the $\\eta(1405)\\to (K^*\\bar K+\\bar K^*K)\\to(K^+K^-+K^0\\bar K^0)\\pi^0\\to f_0(980)\\pi^0 \\to\\pi^+\\pi^- \\pi^0$ transition, has been analyzed. It has been shown that this effect can be correctly quantified only by taking into account the nonzero $K^*$ width. Different scales of isotopic symmetry breaking associated with the $K^+-K^0$ mass difference are compared."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.10749","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"}