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The data, collected with the BaBar detector at the SLAC National Accelerator Laboratory, correspond to 454 million B Bbar pairs produced in e^+ e^- annihilation. We measure the branching fractions BF(B^0 --> K_1(1270)^+ \\pi^- + K_1(1400)^+ \\pi^-) = 3.1^{+0.8}_{-0.7} x10^{-5} and BF(B^+ --> K_1(1270)^0 \\pi^+ + K_1(1400)^0 \\pi^+) = 2.9^{+2.9}_{-1.7} x10^{-5} (<8.2 x10^{-5} at 90% confidence level), where the errors are statistical a"},"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":"0909.2171","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2009-09-11T13:53:24Z","cross_cats_sorted":[],"title_canon_sha256":"214f3dcf420ac441cdbd119400ef3e2f5fce4bdac38e386179b707f303f07e91","abstract_canon_sha256":"c2eec966a018d0bf54403821047be54cb649471fceabb26ebf84cdb932c09197"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:16:12.277117Z","signature_b64":"7MKhTyBT0KfVD1/0z0dkqp4kc4WCxDrkuw+pnypSKDH+GL39oGG3ykjwm2u0TTt/aGfkalja/uYWsvgOiwb0AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6f5b77b3545b95b1c4411bb2dbd942d082a3d90bb43d6c03adc34cf81b9a0e95","last_reissued_at":"2026-05-18T04:16:12.276718Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:16:12.276718Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Measurement of branching fractions of B decays to K1(1270)pi and K1(1400)pi and determination of the CKM angle alpha from B0 --> a1(1260)+/- pi-/+","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"et al, the BABAR Collaboration: B. Aubert","submitted_at":"2009-09-11T13:53:24Z","abstract_excerpt":"We report measurements of the branching fractions of neutral and charged B meson decays to final states containing a K_1(1270) or K_1(1400) meson and a charged pion. The data, collected with the BaBar detector at the SLAC National Accelerator Laboratory, correspond to 454 million B Bbar pairs produced in e^+ e^- annihilation. We measure the branching fractions BF(B^0 --> K_1(1270)^+ \\pi^- + K_1(1400)^+ \\pi^-) = 3.1^{+0.8}_{-0.7} x10^{-5} and BF(B^+ --> K_1(1270)^0 \\pi^+ + K_1(1400)^0 \\pi^+) = 2.9^{+2.9}_{-1.7} x10^{-5} (<8.2 x10^{-5} at 90% confidence level), where the errors are statistical a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.2171","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":""},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"0909.2171","created_at":"2026-05-18T04:16:12.276781+00:00"},{"alias_kind":"arxiv_version","alias_value":"0909.2171v1","created_at":"2026-05-18T04:16:12.276781+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.2171","created_at":"2026-05-18T04:16:12.276781+00:00"},{"alias_kind":"pith_short_12","alias_value":"N5NXPM2ULOK3","created_at":"2026-05-18T12:26:00.592388+00:00"},{"alias_kind":"pith_short_16","alias_value":"N5NXPM2ULOK3DRCB","created_at":"2026-05-18T12:26:00.592388+00:00"},{"alias_kind":"pith_short_8","alias_value":"N5NXPM2U","created_at":"2026-05-18T12:26:00.592388+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/N5NXPM2ULOK3DRCBDOZNXWKC2C","json":"https://pith.science/pith/N5NXPM2ULOK3DRCBDOZNXWKC2C.json","graph_json":"https://pith.science/api/pith-number/N5NXPM2ULOK3DRCBDOZNXWKC2C/graph.json","events_json":"https://pith.science/api/pith-number/N5NXPM2ULOK3DRCBDOZNXWKC2C/events.json","paper":"https://pith.science/paper/N5NXPM2U"},"agent_actions":{"view_html":"https://pith.science/pith/N5NXPM2ULOK3DRCBDOZNXWKC2C","download_json":"https://pith.science/pith/N5NXPM2ULOK3DRCBDOZNXWKC2C.json","view_paper":"https://pith.science/paper/N5NXPM2U","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0909.2171&json=true","fetch_graph":"https://pith.science/api/pith-number/N5NXPM2ULOK3DRCBDOZNXWKC2C/graph.json","fetch_events":"https://pith.science/api/pith-number/N5NXPM2ULOK3DRCBDOZNXWKC2C/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/N5NXPM2ULOK3DRCBDOZNXWKC2C/action/timestamp_anchor","attest_storage":"https://pith.science/pith/N5NXPM2ULOK3DRCBDOZNXWKC2C/action/storage_attestation","attest_author":"https://pith.science/pith/N5NXPM2ULOK3DRCBDOZNXWKC2C/action/author_attestation","sign_citation":"https://pith.science/pith/N5NXPM2ULOK3DRCBDOZNXWKC2C/action/citation_signature","submit_replication":"https://pith.science/pith/N5NXPM2ULOK3DRCBDOZNXWKC2C/action/replication_record"}},"created_at":"2026-05-18T04:16:12.276781+00:00","updated_at":"2026-05-18T04:16:12.276781+00:00"}