{"paper":{"title":"The Decays $K \\to \\pi \\ell^+ \\ell^-$ beyond Leading Order in the Chiral Expansion","license":"","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"G. D'Ambrosio, G. Ecker, G. Isidori, J. Portoles","submitted_at":"1998-08-10T21:47:34Z","abstract_excerpt":"We present a model-independent analysis of $K^+\\to\\pi^+\\ell^+\\ell^-$ and $K_S\\to\\pi^0\\ell^+\\ell^-$ decays, including $K\\to 3 \\pi$ unitarity corrections and a general decomposition of the dispersive amplitude. From the existing data on $K^+\\to\\pi^+ e^+ e^-$ we predict the ratio $R= B(K^+\\to\\pi^+\\mu^+\\mu^-)/B(K^+\\to\\pi^+ e^+ e^-)$ to be larger than 0.23, in slight disagreement with the recent measurement $R = 0.167 \\pm 0.036$. Consequences for the $K^\\pm \\to\\pi^\\pm e^+ e^-$ charge asymmetries and for the $K_L\\to\\pi^0 e^+ e^-$ mode are also discussed."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9808289","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/hep-ph/9808289/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}