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Using a sample of 474 million BBbar pairs collected with the BaBar detector at the PEP-II asymmetric-energy e+e- collider at SLAC we obtain R^{+} = (5^{+12}_{-10}(stat) ^{+2}_{-4}(syst))\\times10^{-3} and R^{-} = (12^{+12}_{-10}(stat) ^{+3}_{-5}(syst))\\times10^{-3}, from which we extract the upper limits at 90% probability: R^+<23\\times10^{-3} and R^-<29\\times10^{-3}. Using these measurements, we obtain an upper limit for the ratio"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1104.4472","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2011-04-22T16:09:39Z","cross_cats_sorted":[],"title_canon_sha256":"6bb8595cb13f187ad7a658788d358725d40ca128b4fdfff0d4485c6738ceadb1","abstract_canon_sha256":"d6cf22b089d5fd22243bafb4bd150d6aa279bacd2b6593fc31aac74f4b006204"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:16:11.771574Z","signature_b64":"ET5YOr0jgfpgbmIbejsFWExIQ3KsWKPDsNxlb0mq4DCcQygnIEqRgX4RPqrtyQX60+VR8aVP8JN0gibdha5OBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d84e90131d8133029ac3d0f87c7e2c86dcab379415bc0743d55d5ed90ec6b841","last_reissued_at":"2026-05-18T04:16:11.771172Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:16:11.771172Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Search for b --> u Transitions in B^{+-} --> [K^{-+} pi^{+-} pi0]_D K^{+-} Decays","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"et al, The BABAR Collaboration: J.-P. 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