{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2009:34PEAKGNN3GZWMK5CNH3C6NTCO","short_pith_number":"pith:34PEAKGN","schema_version":"1.0","canonical_sha256":"df1e4028cd6ecd9b315d134fb179b313b4d0ffd29bf9cd444fe4cccf3f1cc098","source":{"kind":"arxiv","id":"0912.0843","version":2},"attestation_state":"computed","paper":{"title":"Search for CP-violation in Positronium Decay","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"S. Asai, T. Kobayashi, T. Namba, T. Yamazaki","submitted_at":"2009-12-04T16:21:24Z","abstract_excerpt":"CP-violation in the quark sector has been well established over the last decade, but has not been observed in the lepton sector. We search for CP-violating decay processes in positronium, using the angular correlation of (\\vec{S}\\cdot\\vec{k_{1}})(\\vec{S}\\cdot\\vec{k_{1}}\\times\\vec{k_{2}}), where \\vec{S} is the the positronium spin and \\vec{k_{1}}, \\vec{k_{2}} are the directions of the positronium decay photons. To a sensitivity of 2.2\\times10^{-3}, no CP-violation has been found, which is at the level of the CP-violation amplitude in the K meson. A 90% confidence interval of the CP-violation pa"},"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":"0912.0843","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2009-12-04T16:21:24Z","cross_cats_sorted":[],"title_canon_sha256":"eb1e942d1e0846369aa572119ff1a24ae9718f4d78a105e3e2b60da36196e92b","abstract_canon_sha256":"be9d1940326f6c4da90552c4bb3cecd6cbb44125edbea15e1c79b13e3a6aec09"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:23:56.644527Z","signature_b64":"1UV8/JnqZ85kkh28LRKybwUQvknCpZtNWorqIQNv7U9xQJ6JpJZt2E1XFZaLkdybklV39wjEZT+JUMzEIaFKDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"df1e4028cd6ecd9b315d134fb179b313b4d0ffd29bf9cd444fe4cccf3f1cc098","last_reissued_at":"2026-05-18T03:23:56.643868Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:23:56.643868Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Search for CP-violation in Positronium Decay","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"S. Asai, T. Kobayashi, T. Namba, T. Yamazaki","submitted_at":"2009-12-04T16:21:24Z","abstract_excerpt":"CP-violation in the quark sector has been well established over the last decade, but has not been observed in the lepton sector. We search for CP-violating decay processes in positronium, using the angular correlation of (\\vec{S}\\cdot\\vec{k_{1}})(\\vec{S}\\cdot\\vec{k_{1}}\\times\\vec{k_{2}}), where \\vec{S} is the the positronium spin and \\vec{k_{1}}, \\vec{k_{2}} are the directions of the positronium decay photons. To a sensitivity of 2.2\\times10^{-3}, no CP-violation has been found, which is at the level of the CP-violation amplitude in the K meson. A 90% confidence interval of the CP-violation pa"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0912.0843","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":""},"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":"0912.0843","created_at":"2026-05-18T03:23:56.643980+00:00"},{"alias_kind":"arxiv_version","alias_value":"0912.0843v2","created_at":"2026-05-18T03:23:56.643980+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0912.0843","created_at":"2026-05-18T03:23:56.643980+00:00"},{"alias_kind":"pith_short_12","alias_value":"34PEAKGNN3GZ","created_at":"2026-05-18T12:25:58.018023+00:00"},{"alias_kind":"pith_short_16","alias_value":"34PEAKGNN3GZWMK5","created_at":"2026-05-18T12:25:58.018023+00:00"},{"alias_kind":"pith_short_8","alias_value":"34PEAKGN","created_at":"2026-05-18T12:25:58.018023+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/34PEAKGNN3GZWMK5CNH3C6NTCO","json":"https://pith.science/pith/34PEAKGNN3GZWMK5CNH3C6NTCO.json","graph_json":"https://pith.science/api/pith-number/34PEAKGNN3GZWMK5CNH3C6NTCO/graph.json","events_json":"https://pith.science/api/pith-number/34PEAKGNN3GZWMK5CNH3C6NTCO/events.json","paper":"https://pith.science/paper/34PEAKGN"},"agent_actions":{"view_html":"https://pith.science/pith/34PEAKGNN3GZWMK5CNH3C6NTCO","download_json":"https://pith.science/pith/34PEAKGNN3GZWMK5CNH3C6NTCO.json","view_paper":"https://pith.science/paper/34PEAKGN","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0912.0843&json=true","fetch_graph":"https://pith.science/api/pith-number/34PEAKGNN3GZWMK5CNH3C6NTCO/graph.json","fetch_events":"https://pith.science/api/pith-number/34PEAKGNN3GZWMK5CNH3C6NTCO/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/34PEAKGNN3GZWMK5CNH3C6NTCO/action/timestamp_anchor","attest_storage":"https://pith.science/pith/34PEAKGNN3GZWMK5CNH3C6NTCO/action/storage_attestation","attest_author":"https://pith.science/pith/34PEAKGNN3GZWMK5CNH3C6NTCO/action/author_attestation","sign_citation":"https://pith.science/pith/34PEAKGNN3GZWMK5CNH3C6NTCO/action/citation_signature","submit_replication":"https://pith.science/pith/34PEAKGNN3GZWMK5CNH3C6NTCO/action/replication_record"}},"created_at":"2026-05-18T03:23:56.643980+00:00","updated_at":"2026-05-18T03:23:56.643980+00:00"}