{"paper":{"title":"Precise Measurement of the Pi+ -> Pi0 e+ nu Branching Ratio","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A.M. Rozhdestvensky, A.S. Korenchenko, B. A. VanDevender, B.G. Ritchie, C. Broennimann, D. Mzhavia, D. Pocanic, E. Frlez, H.-P. Wirtz, I. Supek, J.F. Crawford, K. O. H. Ziock, L.C. Smith, M. Bychkov, M. Daum, N.A. Kuchinsky, N.P. Kravchuk, N.V. Khomutov, R.C. Minehart, S.M. Korenchenko, S. Ritt, T. Kozlowski, V.A. Baranov, V.V. Sidorkin, W. Bertl, W. Li, Y. Wang, Z. Tsamalaidze","submitted_at":"2003-12-09T20:25:53Z","abstract_excerpt":"Using a large acceptance calorimeter and a stopped pion beam we have made a precise measurement of the rare Pi+ -> Pi0 e+ Nu,(pi_beta) decay branching ratio. We have evaluated the branching ratio by normalizing the number of observed pi_beta decays to the number of observed Pi+ -> e+ Nu, (pi_{e2}) decays. We find the value of Gamma(Pi+ -> Pi0 e+ Nu)/Gamma(total) = [1.036 +/- 0.004(stat.) +/- 0.004(syst.) +/- 0.003(pi_{e2})] x 10^{-8}$, where the first uncertainty is statistical, the second systematic, and the third is the pi_{e2} branching ratio uncertainty. Our result agrees well with the Sta"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ex/0312030","kind":"arxiv","version":2},"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/0312030/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"}