{"paper":{"title":"Isospin Breaking and $\\omega$->$\\pi\\pi$ Decay","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"M.-L. Yan, X.-J. Wang","submitted_at":"2000-03-22T12:33:31Z","abstract_excerpt":"We study $\\omega\\to\\pi^+\\pi^-$ decay up to including all orders of the chiral expansion and one-loop level of mesons in formlism of chiral constituent quark model. This G-parity forbidden decay is caused by $m_u\\neq m_d$ and electromagnetic interaction of mesons. We illustrate that in the formlism both nonresonant contact interaction and $\\rho$ resonance exchange contribute to this process, and the contribution from $\\rho$ resonance exchange is dominant. We obtain that transition matrix element is $<~\\rho|H_{\\rho\\omega}|\\omega>=[-(3956\\pm 280)-(1697\\pm 130)i]$MeV$^2$, and isospin breaking para"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0003218","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"}