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One neutral B meson is fully reconstructed as a J/psi Ks, psi(2S) Ks, chi_c1 Ks, eta_c Ks, J/psi K_L or J/psi K^{*0} decay and the flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we determine sin 2phi_1 = 0.99 +- 0.14(stat) +- 0.06(syst). We conclude"},"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":"hep-ex/0107061","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"hep-ex","submitted_at":"2001-07-23T11:52:17Z","cross_cats_sorted":[],"title_canon_sha256":"9fcaa82b41d38dd1830e02fb755cb719949e4b1791263837e2afa7f92dea1fbc","abstract_canon_sha256":"3cc7a99865ff9ab9e6d122e07b3836955ed921011b3f5dd35779c348d8a5cd87"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:29:40.802803Z","signature_b64":"ho7HsDtWn/zM8DqDRRfcwnLMvKttZSbbir8x7dQlUYJJqZME3/KT4Hd4E4tfEkNhuPOJ766wfihncJKa0Na9BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6cdf118f7f5cd8225fa94c067fc21498d3ec4941fdac7bcd5e38b7d3866232a1","last_reissued_at":"2026-07-04T17:29:40.802387Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:29:40.802387Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Observation of Large CP Violation in the Neutral B Meson System","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"et al, K. Abe, The Belle Collaboration","submitted_at":"2001-07-23T11:52:17Z","abstract_excerpt":"We present a measurement of the Standard Model CP violation parameter sin 2phi_1 based on a 29.1 fb^{-1} data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. One neutral B meson is fully reconstructed as a J/psi Ks, psi(2S) Ks, chi_c1 Ks, eta_c Ks, J/psi K_L or J/psi K^{*0} decay and the flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we determine sin 2phi_1 = 0.99 +- 0.14(stat) +- 0.06(syst). 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