{"paper":{"title":"The Rare Decays $K\\to\\pi\\nu\\bar\\nu$, $B\\to X\\nu\\bar\\nu$ and $B\\to l^+l^-$ -- An Update","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Andrzej J. Buras (TU Munich), Gerhard Buchalla (CERN)","submitted_at":"1999-01-13T10:25:39Z","abstract_excerpt":"We update the Standard Model predictions for the rare decays $K^+\\to\\pi^+\\nu\\bar\\nu$ and $K_L\\to\\pi^0\\nu\\bar\\nu$. In view of improved limits on $B_s$--$\\bar B_s$ mixing we derive a stringent and theoretically clean Standard Model upper limit on $B(K^+\\to\\pi^+\\nu\\bar\\nu)$, which is based on the ratio of $B_d$--$\\bar B_d$ to $B_s$--$\\bar B_s$ mixing, $\\Delta M_d/\\Delta M_s$, alone. This method avoids the large hadronic uncertainties present in the usual analysis of the CKM matrix. We find $B(K^+\\to\\pi^+\\nu\\bar\\nu)< 1.67\\cdot 10^{-10}$, which can be further improved in the future. In addition we "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9901288","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/9901288/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"}