{"paper":{"title":"A New Measurement of the Rare Decay $K^+\\to \\pi^+ \\mu^+ \\mu^-$","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. A. Poblaguev, A. Sher, B. Bassalleck, D. Bergman, D. E. Kraus, D. M. Lazarus, G. S. Atoyan, H. Do, H. Fischer, H. Kaspar, H. Ma, J. A. Thompson, J. Egger, J. Lowe, J. Lozano, M. E. Zeller, N. Cheung, P. Lichard, P. Rehak, P. Truoel, R. Appel, S. Dhawan, S. Eilerts, S. Pislak, V. V. Issakov, W. Herold, W. Majid, W. Menzel","submitted_at":"1999-10-21T21:12:01Z","abstract_excerpt":"More than 400 $K^{+}\\to\\pi^{+}\\mu^+\\mu^-$ events were observed in a rare $K^+$ decay experiment at the AGS. Normalized to the $K^{+}\\to\\pi^{+}\\pi^+\\pi^-$ decay, the branching ratio is determined to be $(9.22 \\pm 0.60 (stat) \\pm 0.49 (syst))\\times 10^{-8}$. This branching ratio and the $\\mu\\mu$ mass spectrum is in very good agreement with the measurement of the $K^{+}\\to\\pi^{+}e^+e^-$ decay, but deviates significantly from the previous measurement."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ex/9910047","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-ex/9910047/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"}