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The measured branching fractions are Br(B^+- -> eta K^+-) = (2.12 +- 0.23 +- 0.11)x10^-6}, Br(B^+- -> eta pi^+-) = (4.07 +- 0.26 +- 0.21)x10^{-6} and Br(B^0 -> eta K^0) = (1.27^{+0.33}_{-0.29} +- 0.08)x10^-6, where the last decay is observed for the first time with a significance of 5.4 standard deviations (\\sigma)"},"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":"1110.2000","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2011-10-10T10:55:54Z","cross_cats_sorted":[],"title_canon_sha256":"06d752a8ff82575e5b1767137c1fce12e8712e06da348264e861bc7f35aea0c2","abstract_canon_sha256":"a7d4be8d93c195e9dee45f47b5cb5a50ea3862bb69898241e6552968223131c8"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:53:37.608391Z","signature_b64":"q8JSkjs9znxFyPWIZCU9/ph1Hm4S50XjYq1qNctfCmrm3KlnL9P38rt4m4YiqSXkw30fyrz2x//yihQj4f6NAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"072c3510a9a30ebc59cb594eef49c608e5b32dc88105adbe19af5f99d0a1211c","last_reissued_at":"2026-07-04T23:53:37.607942Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:53:37.607942Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Evidence for Direct CP Violation in $B^\\pm \\to \\eta h^\\pm$ and Observation of $B^0 \\to \\eta K^0$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"C.-T. 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