{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2007:YMBJD4M2TPUB54XD3FHFS4F2DJ","short_pith_number":"pith:YMBJD4M2","schema_version":"1.0","canonical_sha256":"c30291f19a9be81ef2e3d94e5970ba1a45b2f99bded6b1fc1e9a6895e3377e34","source":{"kind":"arxiv","id":"hep-ph/0701077","version":2},"attestation_state":"computed","paper":{"title":"Axial anomaly and the precise value of the $\\pi^0 \\to 2 \\gamma$ decay width","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"A.G.Oganesian, B.L.Ioffe","submitted_at":"2007-01-10T13:58:49Z","abstract_excerpt":"The anomaly in the vacuum expectation value of the product of axial and two vector currents (AVV) in QCD is investigated. The goal is to determine from its value the $\\pi^0 \\to 2 \\gamma$ decay width with high precision. The sum rule for AVV formfactor is studied. The difference $f_{\\pi^0} - f_{\\pi^+}$ caused by strong interaction is calculated and appears to be small. The $\\pi^0 - \\eta$ mixing is accounted. The $\\pi^0 \\to 2 \\gamma$ decay width determined theoretically from the axial anomaly is found to be $\\Gamma(\\pi^0 \\to 2 \\gamma) = 7.93 eV$ with an error $\\sim 1.5%$. The measurement of the "},"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-ph/0701077","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"hep-ph","submitted_at":"2007-01-10T13:58:49Z","cross_cats_sorted":[],"title_canon_sha256":"9a3034afd4eab97c3c62e5df6c68d993d5ea3685bda99a3e682f1e60986e62f4","abstract_canon_sha256":"2b3bb6305fa2b6931c59ec58938c0f8d57c9f5649b291adea19f0e487208fc78"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:22:07.079293Z","signature_b64":"sROFf1/vxrTL5YmNwIdeSL4h1VBI2e0z1pC2mFE4hETAHaAKvWiCRfsZKJEXs/idoC7iQsUI6cG0ITHp5dPpDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c30291f19a9be81ef2e3d94e5970ba1a45b2f99bded6b1fc1e9a6895e3377e34","last_reissued_at":"2026-07-04T15:22:07.078900Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:22:07.078900Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Axial anomaly and the precise value of the $\\pi^0 \\to 2 \\gamma$ decay width","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"A.G.Oganesian, B.L.Ioffe","submitted_at":"2007-01-10T13:58:49Z","abstract_excerpt":"The anomaly in the vacuum expectation value of the product of axial and two vector currents (AVV) in QCD is investigated. The goal is to determine from its value the $\\pi^0 \\to 2 \\gamma$ decay width with high precision. The sum rule for AVV formfactor is studied. The difference $f_{\\pi^0} - f_{\\pi^+}$ caused by strong interaction is calculated and appears to be small. The $\\pi^0 - \\eta$ mixing is accounted. The $\\pi^0 \\to 2 \\gamma$ decay width determined theoretically from the axial anomaly is found to be $\\Gamma(\\pi^0 \\to 2 \\gamma) = 7.93 eV$ with an error $\\sim 1.5%$. The measurement of the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0701077","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/hep-ph/0701077/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"hep-ph/0701077","created_at":"2026-07-04T15:22:07.078959+00:00"},{"alias_kind":"arxiv_version","alias_value":"hep-ph/0701077v2","created_at":"2026-07-04T15:22:07.078959+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-ph/0701077","created_at":"2026-07-04T15:22:07.078959+00:00"},{"alias_kind":"pith_short_12","alias_value":"YMBJD4M2TPUB","created_at":"2026-07-04T15:22:07.078959+00:00"},{"alias_kind":"pith_short_16","alias_value":"YMBJD4M2TPUB54XD","created_at":"2026-07-04T15:22:07.078959+00:00"},{"alias_kind":"pith_short_8","alias_value":"YMBJD4M2","created_at":"2026-07-04T15:22:07.078959+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2606.11181","citing_title":"Combined Analysis of Lattice QCD and Experimental Data on the Pion Transition Form Factor","ref_index":75,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/YMBJD4M2TPUB54XD3FHFS4F2DJ","json":"https://pith.science/pith/YMBJD4M2TPUB54XD3FHFS4F2DJ.json","graph_json":"https://pith.science/api/pith-number/YMBJD4M2TPUB54XD3FHFS4F2DJ/graph.json","events_json":"https://pith.science/api/pith-number/YMBJD4M2TPUB54XD3FHFS4F2DJ/events.json","paper":"https://pith.science/paper/YMBJD4M2"},"agent_actions":{"view_html":"https://pith.science/pith/YMBJD4M2TPUB54XD3FHFS4F2DJ","download_json":"https://pith.science/pith/YMBJD4M2TPUB54XD3FHFS4F2DJ.json","view_paper":"https://pith.science/paper/YMBJD4M2","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=hep-ph/0701077&json=true","fetch_graph":"https://pith.science/api/pith-number/YMBJD4M2TPUB54XD3FHFS4F2DJ/graph.json","fetch_events":"https://pith.science/api/pith-number/YMBJD4M2TPUB54XD3FHFS4F2DJ/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/YMBJD4M2TPUB54XD3FHFS4F2DJ/action/timestamp_anchor","attest_storage":"https://pith.science/pith/YMBJD4M2TPUB54XD3FHFS4F2DJ/action/storage_attestation","attest_author":"https://pith.science/pith/YMBJD4M2TPUB54XD3FHFS4F2DJ/action/author_attestation","sign_citation":"https://pith.science/pith/YMBJD4M2TPUB54XD3FHFS4F2DJ/action/citation_signature","submit_replication":"https://pith.science/pith/YMBJD4M2TPUB54XD3FHFS4F2DJ/action/replication_record"}},"created_at":"2026-07-04T15:22:07.078959+00:00","updated_at":"2026-07-04T15:22:07.078959+00:00"}