{"paper":{"title":"Measurement of the Branching Ratio and Form Factors for the Decay \\boldmath $K_L\\to\\pi^{\\pm}\\pi^0e^{\\mp}\\nu_e(\\bar\\nu_e)","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"et al, NA48 Collaboration: J.R. Batley","submitted_at":"2004-05-07T12:03:51Z","abstract_excerpt":"The $K_L\\to\\pi^{\\pm}\\pi^0e^{\\mp}\\nu_e(\\bar\\nu_e)$ decay was investigated with the NA48 detector at CERN SPS using a beam of long-lived neutral kaons. The branching ratio $Br(K_L\\to\\pi^{\\pm}\\pi^0e^{\\mp}\\nu_e(\\bar\\nu_e))=(5.21\\pm 0.07_{stat}\\pm 0.09_{syst})\\times 10^{-5}$ was fixed from a sample of 5464 events with 62 background events. The form factors $\\bar{f}_s$, $\\bar{f}_p$, $\\lambda_g$ and $\\bar{h}$ were found to be in agreement with previous measurements but with higher accuracy. The coupling parameter of the chiral Lagrangian $L_3=(-4.1\\pm 0.2)\\times 10^{-3}$ was evaluated from the data."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ex/0405010","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/0405010/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"}