{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:ZWAHXCQYNWWZFFLWU4ON54ABTU","short_pith_number":"pith:ZWAHXCQY","canonical_record":{"source":{"id":"0804.3478","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2008-04-22T09:29:58Z","cross_cats_sorted":["nucl-th"],"title_canon_sha256":"239d185bbbe501f251905de39ccb0e352cc1af61ee6fa047ebdc5d7ac4978250","abstract_canon_sha256":"e9095cde52504fbffc7c43410bca2faa2cf2ea4356eac2fdda882a5216f6d980"},"schema_version":"1.0"},"canonical_sha256":"cd807b8a186dad929576a71cdef0019d1d65f3c083ef8fe698c6cbd3c6ad28be","source":{"kind":"arxiv","id":"0804.3478","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0804.3478","created_at":"2026-07-04T15:34:06Z"},{"alias_kind":"arxiv_version","alias_value":"0804.3478v2","created_at":"2026-07-04T15:34:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0804.3478","created_at":"2026-07-04T15:34:06Z"},{"alias_kind":"pith_short_12","alias_value":"ZWAHXCQYNWWZ","created_at":"2026-07-04T15:34:06Z"},{"alias_kind":"pith_short_16","alias_value":"ZWAHXCQYNWWZFFLW","created_at":"2026-07-04T15:34:06Z"},{"alias_kind":"pith_short_8","alias_value":"ZWAHXCQY","created_at":"2026-07-04T15:34:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:ZWAHXCQYNWWZFFLWU4ON54ABTU","target":"record","payload":{"canonical_record":{"source":{"id":"0804.3478","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2008-04-22T09:29:58Z","cross_cats_sorted":["nucl-th"],"title_canon_sha256":"239d185bbbe501f251905de39ccb0e352cc1af61ee6fa047ebdc5d7ac4978250","abstract_canon_sha256":"e9095cde52504fbffc7c43410bca2faa2cf2ea4356eac2fdda882a5216f6d980"},"schema_version":"1.0"},"canonical_sha256":"cd807b8a186dad929576a71cdef0019d1d65f3c083ef8fe698c6cbd3c6ad28be","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:34:06.062248Z","signature_b64":"VGqCnS5wckXH+jauaI942032aGIo6wn3ss8bUrs7TdWwjROVGks8WHt5mvRxVYcvMkqQ+sfzvr0xo/qsN/72Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cd807b8a186dad929576a71cdef0019d1d65f3c083ef8fe698c6cbd3c6ad28be","last_reissued_at":"2026-07-04T15:34:06.061845Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:34:06.061845Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0804.3478","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T15:34:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"E9WFGIXtv8yR0Eq/8OtDdZ42nkzgd3DA3HlBu+bH8XzPbKDNP+HSNTZVdpIdaEzehpKOH66Rvi3W05Bl1G1TAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T16:50:54.749324Z"},"content_sha256":"47d9e8e72763497af230872b8ae156fb7c7a9508160f35456efdfacdf0392bac","schema_version":"1.0","event_id":"sha256:47d9e8e72763497af230872b8ae156fb7c7a9508160f35456efdfacdf0392bac"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:ZWAHXCQYNWWZFFLWU4ON54ABTU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"U_A(1) anomaly and eta' mass from an infrared singular quark-gluon vertex","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-th"],"primary_cat":"hep-ph","authors_text":"Christian S. Fischer, Reinhard Alkofer, Richard Williams","submitted_at":"2008-04-22T09:29:58Z","abstract_excerpt":"The $U_A(1)$ problem of QCD is inevitably tied to the infrared behaviour of quarks and gluons with its most visible effect being the $\\eta^\\prime$ mass. A dimensional argument of Kogut and Susskind showed that the mixing of the pseudoscalar flavour-singlet mesons with gluons can provide a screening of the Goldstone pole in this channel if the full quark-quark interaction is strongly infrared singular as $\\sim 1/k^4$. We investigate this idea using previously obtained results for the Landau gauge ghost and gluon propagator, together with recent determinations for the singular behaviour of the q"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0804.3478","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/0804.3478/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T15:34:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kmoU95ye3sXXcgJB2bFFgsmwY3WaxaDPULIo3vHHFUP/CFFwm3DdwC2SCo+gcPgU8ozgUDrAtCHiScBRllEAAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T16:50:54.750654Z"},"content_sha256":"e3e28af7847bd57755d115a244940b170ff1c820dfc4a9f8060115dd5f7aba31","schema_version":"1.0","event_id":"sha256:e3e28af7847bd57755d115a244940b170ff1c820dfc4a9f8060115dd5f7aba31"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZWAHXCQYNWWZFFLWU4ON54ABTU/bundle.json","state_url":"https://pith.science/pith/ZWAHXCQYNWWZFFLWU4ON54ABTU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZWAHXCQYNWWZFFLWU4ON54ABTU/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-04T16:50:54Z","links":{"resolver":"https://pith.science/pith/ZWAHXCQYNWWZFFLWU4ON54ABTU","bundle":"https://pith.science/pith/ZWAHXCQYNWWZFFLWU4ON54ABTU/bundle.json","state":"https://pith.science/pith/ZWAHXCQYNWWZFFLWU4ON54ABTU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZWAHXCQYNWWZFFLWU4ON54ABTU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:ZWAHXCQYNWWZFFLWU4ON54ABTU","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":"e9095cde52504fbffc7c43410bca2faa2cf2ea4356eac2fdda882a5216f6d980","cross_cats_sorted":["nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2008-04-22T09:29:58Z","title_canon_sha256":"239d185bbbe501f251905de39ccb0e352cc1af61ee6fa047ebdc5d7ac4978250"},"schema_version":"1.0","source":{"id":"0804.3478","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0804.3478","created_at":"2026-07-04T15:34:06Z"},{"alias_kind":"arxiv_version","alias_value":"0804.3478v2","created_at":"2026-07-04T15:34:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0804.3478","created_at":"2026-07-04T15:34:06Z"},{"alias_kind":"pith_short_12","alias_value":"ZWAHXCQYNWWZ","created_at":"2026-07-04T15:34:06Z"},{"alias_kind":"pith_short_16","alias_value":"ZWAHXCQYNWWZFFLW","created_at":"2026-07-04T15:34:06Z"},{"alias_kind":"pith_short_8","alias_value":"ZWAHXCQY","created_at":"2026-07-04T15:34:06Z"}],"graph_snapshots":[{"event_id":"sha256:e3e28af7847bd57755d115a244940b170ff1c820dfc4a9f8060115dd5f7aba31","target":"graph","created_at":"2026-07-04T15:34:06Z","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/0804.3478/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The $U_A(1)$ problem of QCD is inevitably tied to the infrared behaviour of quarks and gluons with its most visible effect being the $\\eta^\\prime$ mass. A dimensional argument of Kogut and Susskind showed that the mixing of the pseudoscalar flavour-singlet mesons with gluons can provide a screening of the Goldstone pole in this channel if the full quark-quark interaction is strongly infrared singular as $\\sim 1/k^4$. We investigate this idea using previously obtained results for the Landau gauge ghost and gluon propagator, together with recent determinations for the singular behaviour of the q","authors_text":"Christian S. Fischer, Reinhard Alkofer, Richard Williams","cross_cats":["nucl-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2008-04-22T09:29:58Z","title":"U_A(1) anomaly and eta' mass from an infrared singular quark-gluon vertex"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0804.3478","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":"sha256:47d9e8e72763497af230872b8ae156fb7c7a9508160f35456efdfacdf0392bac","target":"record","created_at":"2026-07-04T15:34:06Z","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":"e9095cde52504fbffc7c43410bca2faa2cf2ea4356eac2fdda882a5216f6d980","cross_cats_sorted":["nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2008-04-22T09:29:58Z","title_canon_sha256":"239d185bbbe501f251905de39ccb0e352cc1af61ee6fa047ebdc5d7ac4978250"},"schema_version":"1.0","source":{"id":"0804.3478","kind":"arxiv","version":2}},"canonical_sha256":"cd807b8a186dad929576a71cdef0019d1d65f3c083ef8fe698c6cbd3c6ad28be","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cd807b8a186dad929576a71cdef0019d1d65f3c083ef8fe698c6cbd3c6ad28be","first_computed_at":"2026-07-04T15:34:06.061845Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:34:06.061845Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VGqCnS5wckXH+jauaI942032aGIo6wn3ss8bUrs7TdWwjROVGks8WHt5mvRxVYcvMkqQ+sfzvr0xo/qsN/72Aw==","signature_status":"signed_v1","signed_at":"2026-07-04T15:34:06.062248Z","signed_message":"canonical_sha256_bytes"},"source_id":"0804.3478","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:47d9e8e72763497af230872b8ae156fb7c7a9508160f35456efdfacdf0392bac","sha256:e3e28af7847bd57755d115a244940b170ff1c820dfc4a9f8060115dd5f7aba31"],"state_sha256":"be2c95c65f6780cdf0247f5f62decbc5a116b230bc3007445922378a7b75d71a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"luuqtQiLwVdWuRtRtKB5TZuI8A+r60SCSYbuQX1iSIADGN43gBAG54su3T3iSjbrMZLXh6ItqRA0b9hzF7ElAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T16:50:54.756262Z","bundle_sha256":"6cba87d99edbd02c72d13d7d6a270dd68bf759b10a7d3ec8763f7d0dff29d10b"}}