{"paper":{"title":"Observation of the isospin breaking decay $\\Upsilon(10860)\\to\\Upsilon(1S)f_0(980)\\to\\Upsilon(1S)\\eta\\pi^0$ with the Belle II detector","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":"2017-09-07T05:00:59Z","abstract_excerpt":"Using the Belle data on the decay $\\Upsilon(10860)\\to \\Upsilon(1S)f_0(980)\\to\\Upsilon(1S)\\pi^+\\pi^-$, we estimate the fraction of the process $\\Upsilon(10860)\\to\\Upsilon(1S)f_0(980)\\to \\Upsilon(1S)\\eta\\pi^0$, caused by the mixing of $a^0_0(980)$ and $f_0(980)$ resonances that breaks the isotopic invariance due to the $K^+$ and $K^0$ meson mass difference. With an instantaneous luminosity of $8\\times10^{35}$ cm$^2\\cdot$\\,s$^{-1}$ at the SuperKEKB collider, one can collect with the Belle II detector about a hundred $\\Upsilon(10860)\\to\\Upsilon(1S)\\eta\\pi^0$ events in the narrow region of the $\\et"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1709.02068","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"}