{"paper":{"title":"K_L to \\pi^+ \\pi^- e^+ e^-","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"John K. Elwood, Mark B. Wise, Martin J. Savage","submitted_at":"1995-04-11T20:32:29Z","abstract_excerpt":"We calculate all of the form factors for the one-photon, $K_L \\rightarrow \\pi^+ \\pi^- \\gamma^* \\rightarrow \\pi^+ \\pi^- e^+e^-$ contribution to the $K_L \\rightarrow \\pi^+ \\pi^- e^+e^-$ decay amplitude at leading order in chiral perturbation theory. These form factors depend on one unknown constant that is a linear combination of coefficients of local ${\\cal O}(p^4)$ operators in the chiral lagrangian for weak radiative kaon decay. We determine the differential rate for $\\K$ and also the magnitude of two CP violating observables."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9504288","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"}