{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:KI4FA4ESRUNTQ5R5KAGBWAVWLC","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"a4ea6e7ff04fc253deaa5d196704daa6863d0a3ecc7ccf25ff5023126b82345d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2011-09-02T01:14:54Z","title_canon_sha256":"d5b99650278037b6022fa5fa01f171de96d37b777d82524a14fe0f3a246c42f0"},"schema_version":"1.0","source":{"id":"1109.0926","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1109.0926","created_at":"2026-05-18T03:31:54Z"},{"alias_kind":"arxiv_version","alias_value":"1109.0926v2","created_at":"2026-05-18T03:31:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1109.0926","created_at":"2026-05-18T03:31:54Z"},{"alias_kind":"pith_short_12","alias_value":"KI4FA4ESRUNT","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_16","alias_value":"KI4FA4ESRUNTQ5R5","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_8","alias_value":"KI4FA4ES","created_at":"2026-05-18T12:26:32Z"}],"graph_snapshots":[{"event_id":"sha256:369a71ed7209f91eaf2ea38e866307a30d9035dff7bed1d8e12c9b94e9798c33","target":"graph","created_at":"2026-05-18T03:31:54Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We first confirm that Nishijima's method of the $\\pi^0 \\rightarrow \\gamma +\\gamma $ calculation can precisely reproduce the observed life time of $\\pi^0$ decay. Then, we calculate, for the first time, the T-matrix of the $Z^0 \\rightarrow \\gamma +\\gamma $ process in which the vertex of the $\\gamma^\\mu \\gamma_5$ is responsible for the decay of the weak vector boson. Even though the decay rate itself vanishes to zero due to the symmetry nature of two photons (Landau-Yang theorem), the T-matrix of the process has neither linear nor logarithmic divergences. Therefore, there is no room for the regul","authors_text":"H. Kato, H. Tsuda, N. Kanda, R. Abe, T. Fujita","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2011-09-02T01:14:54Z","title":"T-matrix of $Z^0$ Decay into Two Photons"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1109.0926","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:7161f9b15e959258b8df8d4d633015337f8145881b5b26063971b963f622b3e7","target":"record","created_at":"2026-05-18T03:31:54Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"a4ea6e7ff04fc253deaa5d196704daa6863d0a3ecc7ccf25ff5023126b82345d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2011-09-02T01:14:54Z","title_canon_sha256":"d5b99650278037b6022fa5fa01f171de96d37b777d82524a14fe0f3a246c42f0"},"schema_version":"1.0","source":{"id":"1109.0926","kind":"arxiv","version":2}},"canonical_sha256":"52385070928d1b38763d500c1b02b658a87c507b498891e5d10b100a1b76f18c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"52385070928d1b38763d500c1b02b658a87c507b498891e5d10b100a1b76f18c","first_computed_at":"2026-05-18T03:31:54.444825Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:31:54.444825Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Jz797YH+QO8GCvzqer/exOxf/VeS2eYLKRzJ+x0FU7oEoNXaieZO5FHcDnpBFlTwwX8ja/bxVse9wn8KzWhsBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:31:54.445774Z","signed_message":"canonical_sha256_bytes"},"source_id":"1109.0926","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7161f9b15e959258b8df8d4d633015337f8145881b5b26063971b963f622b3e7","sha256:369a71ed7209f91eaf2ea38e866307a30d9035dff7bed1d8e12c9b94e9798c33"],"state_sha256":"dca345c43ebab9dcf6b29d4939fb0a0ca837b6787ec7781c8ef0166f1c6b2993"}