{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:DWXPPTEXY5XM5PIRPEE7OL2N3B","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":"1fc160ab2df065d3c1f239990d35bcbba9afabd43925afe28b0c387847f20312","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-08-19T13:44:15Z","title_canon_sha256":"d07db067d03443fa1de837f982d91726f0ce7c32eea65409ae9e9aee02b45e99"},"schema_version":"1.0","source":{"id":"1908.06797","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.06797","created_at":"2026-07-04T23:58:19Z"},{"alias_kind":"arxiv_version","alias_value":"1908.06797v1","created_at":"2026-07-04T23:58:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.06797","created_at":"2026-07-04T23:58:19Z"},{"alias_kind":"pith_short_12","alias_value":"DWXPPTEXY5XM","created_at":"2026-07-04T23:58:19Z"},{"alias_kind":"pith_short_16","alias_value":"DWXPPTEXY5XM5PIR","created_at":"2026-07-04T23:58:19Z"},{"alias_kind":"pith_short_8","alias_value":"DWXPPTEX","created_at":"2026-07-04T23:58:19Z"}],"graph_snapshots":[{"event_id":"sha256:2a229944a0618d7afdae5b2896bd5371fda9fbe7019d2b8c9e5ca0a2e00f4cf0","target":"graph","created_at":"2026-07-04T23:58:19Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1908.06797/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The $U(1)_A$ boson mass is calculated through the phenomenological characteristics of the vacuum related to spontaneous breaking of chiral symmetry in QCD. The mass is determined by the mixed quark-gluon condensate $\\langle \\bar q G q \\rangle$ that emerges in an appropriate correlation function due to triangle anomaly. For three flavor QCD in chiral limit we find the numerical value for the $U(1)_A$ boson mass to be $M_0=310\\pm 50~{\\rm MeV}$.","authors_text":"Alexei A. Pivovarov, Thomas Mannel","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-08-19T13:44:15Z","title":"Chiral condensates in massless QCD and the $U(1)_A$ boson mass"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.06797","kind":"arxiv","version":1},"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:a54ae90e5b0ea8e4a4d9a8c7ec351da4854a880e8eb7554f4baedb8ca614cbae","target":"record","created_at":"2026-07-04T23:58:19Z","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":"1fc160ab2df065d3c1f239990d35bcbba9afabd43925afe28b0c387847f20312","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-08-19T13:44:15Z","title_canon_sha256":"d07db067d03443fa1de837f982d91726f0ce7c32eea65409ae9e9aee02b45e99"},"schema_version":"1.0","source":{"id":"1908.06797","kind":"arxiv","version":1}},"canonical_sha256":"1daef7cc97c76ecebd117909f72f4dd8524f618bede501e9de8db8b322b934cc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1daef7cc97c76ecebd117909f72f4dd8524f618bede501e9de8db8b322b934cc","first_computed_at":"2026-07-04T23:58:19.445167Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:58:19.445167Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+NtdD+bjMS9QjU6ikUL5EwZvVzyQeEAPM7CpmFKwZ5isLN96ZuH2JOasi+l8KhWEXMdHKf53J24+vDtA/Sf1Ag==","signature_status":"signed_v1","signed_at":"2026-07-04T23:58:19.445569Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.06797","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a54ae90e5b0ea8e4a4d9a8c7ec351da4854a880e8eb7554f4baedb8ca614cbae","sha256:2a229944a0618d7afdae5b2896bd5371fda9fbe7019d2b8c9e5ca0a2e00f4cf0"],"state_sha256":"b07bc9b3e15c46a977dd1a4a11dbf5246ce39a6b287dc3dbdb70edfa08425975"}