{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:POX4YSXPHDA5ZM5BLTJAQ7PHOQ","short_pith_number":"pith:POX4YSXP","canonical_record":{"source":{"id":"2112.09210","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2021-12-16T21:39:14Z","cross_cats_sorted":["hep-ex","hep-lat","nucl-ex","nucl-th"],"title_canon_sha256":"9d15a4f9f018516550bd66c2f8e2e23f302011442039d229de1863167696f454","abstract_canon_sha256":"aeec90a7af049396e23ef7c7a6971cca599c094f06d91b027149b55277af03b9"},"schema_version":"1.0"},"canonical_sha256":"7bafcc4aef38c1dcb3a15cd2087de77438e66c4e7e9984fbaefc6865520273f9","source":{"kind":"arxiv","id":"2112.09210","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2112.09210","created_at":"2026-07-05T03:55:15Z"},{"alias_kind":"arxiv_version","alias_value":"2112.09210v1","created_at":"2026-07-05T03:55:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2112.09210","created_at":"2026-07-05T03:55:15Z"},{"alias_kind":"pith_short_12","alias_value":"POX4YSXPHDA5","created_at":"2026-07-05T03:55:15Z"},{"alias_kind":"pith_short_16","alias_value":"POX4YSXPHDA5ZM5B","created_at":"2026-07-05T03:55:15Z"},{"alias_kind":"pith_short_8","alias_value":"POX4YSXP","created_at":"2026-07-05T03:55:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:POX4YSXPHDA5ZM5BLTJAQ7PHOQ","target":"record","payload":{"canonical_record":{"source":{"id":"2112.09210","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2021-12-16T21:39:14Z","cross_cats_sorted":["hep-ex","hep-lat","nucl-ex","nucl-th"],"title_canon_sha256":"9d15a4f9f018516550bd66c2f8e2e23f302011442039d229de1863167696f454","abstract_canon_sha256":"aeec90a7af049396e23ef7c7a6971cca599c094f06d91b027149b55277af03b9"},"schema_version":"1.0"},"canonical_sha256":"7bafcc4aef38c1dcb3a15cd2087de77438e66c4e7e9984fbaefc6865520273f9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:55:15.223233Z","signature_b64":"SK4ybcfHKpi8HHZg5Ve5eVpPSxJUstKRmZWX5wQGCVVjjSkhvtc4OLsOT/pnZjx/Jizgg3sGVLrvXVjVElHLBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7bafcc4aef38c1dcb3a15cd2087de77438e66c4e7e9984fbaefc6865520273f9","last_reissued_at":"2026-07-05T03:55:15.222666Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:55:15.222666Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2112.09210","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:55:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3X52aFFjoUYJ9eGE+VL7yap6jH/YGU8RCJPy4vfME14DuVgmmpHqo/rxhTg6YPHMpciLpwVS5PbIEULJHUWlAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-21T06:11:15.023225Z"},"content_sha256":"d0ed11e251e757ad621985caedcc32690b896bf943269217c54d2aaeba284d3d","schema_version":"1.0","event_id":"sha256:d0ed11e251e757ad621985caedcc32690b896bf943269217c54d2aaeba284d3d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:POX4YSXPHDA5ZM5BLTJAQ7PHOQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Concerning pion parton distributions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex","hep-lat","nucl-ex","nucl-th"],"primary_cat":"hep-ph","authors_text":"C. D. Roberts, D. Binosi, J. M. Morgado, J. Papavassiliou, J. Rodr\\'iguez-Quintero, K. Raya, L. Chang, M. Ding, S. M. Schmidt, Z.-F. Cui","submitted_at":"2021-12-16T21:39:14Z","abstract_excerpt":"Analyses of the pion valence-quark distribution function (DF), ${u}^\\pi(x;\\zeta)$, which explicitly incorporate the behaviour of the pion wave function prescribed by quantum chromodynamics (QCD), predict ${u}^\\pi(x\\simeq 1;\\zeta) \\sim (1-x)^{\\beta(\\zeta)}$, $\\beta(\\zeta \\gtrsim m_p)>2$, where $m_p$ is the proton mass. Nevertheless, more than forty years after the first experiment to collect data suitable for extracting the $x\\simeq 1$ behaviour of ${u}^\\pi$, the empirical status remains uncertain because some methods used to fit existing data return a result for ${u}^\\pi$ that violates this co"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2112.09210","kind":"arxiv","version":1},"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/2112.09210/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":"2026-07-05T03:55:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"d9LB1UMSAZ+Uwdt8c7juxzUAySahxI1tEK/2ld/CTC5hFftFSGyIOZex/4oLk6UnNwxFNo6r0RSseDh1j+cYBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-21T06:11:15.024729Z"},"content_sha256":"40b273fe608f5eee2ec0396a366cf31e73d89aaa15b9f2a499fbd29fda25d32c","schema_version":"1.0","event_id":"sha256:40b273fe608f5eee2ec0396a366cf31e73d89aaa15b9f2a499fbd29fda25d32c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/POX4YSXPHDA5ZM5BLTJAQ7PHOQ/bundle.json","state_url":"https://pith.science/pith/POX4YSXPHDA5ZM5BLTJAQ7PHOQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/POX4YSXPHDA5ZM5BLTJAQ7PHOQ/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":"2026-08-21T06:11:15Z","links":{"resolver":"https://pith.science/pith/POX4YSXPHDA5ZM5BLTJAQ7PHOQ","bundle":"https://pith.science/pith/POX4YSXPHDA5ZM5BLTJAQ7PHOQ/bundle.json","state":"https://pith.science/pith/POX4YSXPHDA5ZM5BLTJAQ7PHOQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/POX4YSXPHDA5ZM5BLTJAQ7PHOQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:POX4YSXPHDA5ZM5BLTJAQ7PHOQ","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":"aeec90a7af049396e23ef7c7a6971cca599c094f06d91b027149b55277af03b9","cross_cats_sorted":["hep-ex","hep-lat","nucl-ex","nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2021-12-16T21:39:14Z","title_canon_sha256":"9d15a4f9f018516550bd66c2f8e2e23f302011442039d229de1863167696f454"},"schema_version":"1.0","source":{"id":"2112.09210","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2112.09210","created_at":"2026-07-05T03:55:15Z"},{"alias_kind":"arxiv_version","alias_value":"2112.09210v1","created_at":"2026-07-05T03:55:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2112.09210","created_at":"2026-07-05T03:55:15Z"},{"alias_kind":"pith_short_12","alias_value":"POX4YSXPHDA5","created_at":"2026-07-05T03:55:15Z"},{"alias_kind":"pith_short_16","alias_value":"POX4YSXPHDA5ZM5B","created_at":"2026-07-05T03:55:15Z"},{"alias_kind":"pith_short_8","alias_value":"POX4YSXP","created_at":"2026-07-05T03:55:15Z"}],"graph_snapshots":[{"event_id":"sha256:40b273fe608f5eee2ec0396a366cf31e73d89aaa15b9f2a499fbd29fda25d32c","target":"graph","created_at":"2026-07-05T03:55:15Z","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/2112.09210/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Analyses of the pion valence-quark distribution function (DF), ${u}^\\pi(x;\\zeta)$, which explicitly incorporate the behaviour of the pion wave function prescribed by quantum chromodynamics (QCD), predict ${u}^\\pi(x\\simeq 1;\\zeta) \\sim (1-x)^{\\beta(\\zeta)}$, $\\beta(\\zeta \\gtrsim m_p)>2$, where $m_p$ is the proton mass. Nevertheless, more than forty years after the first experiment to collect data suitable for extracting the $x\\simeq 1$ behaviour of ${u}^\\pi$, the empirical status remains uncertain because some methods used to fit existing data return a result for ${u}^\\pi$ that violates this co","authors_text":"C. D. Roberts, D. Binosi, J. M. Morgado, J. Papavassiliou, J. Rodr\\'iguez-Quintero, K. Raya, L. Chang, M. Ding, S. M. Schmidt, Z.-F. Cui","cross_cats":["hep-ex","hep-lat","nucl-ex","nucl-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2021-12-16T21:39:14Z","title":"Concerning pion parton distributions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2112.09210","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:d0ed11e251e757ad621985caedcc32690b896bf943269217c54d2aaeba284d3d","target":"record","created_at":"2026-07-05T03:55:15Z","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":"aeec90a7af049396e23ef7c7a6971cca599c094f06d91b027149b55277af03b9","cross_cats_sorted":["hep-ex","hep-lat","nucl-ex","nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2021-12-16T21:39:14Z","title_canon_sha256":"9d15a4f9f018516550bd66c2f8e2e23f302011442039d229de1863167696f454"},"schema_version":"1.0","source":{"id":"2112.09210","kind":"arxiv","version":1}},"canonical_sha256":"7bafcc4aef38c1dcb3a15cd2087de77438e66c4e7e9984fbaefc6865520273f9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7bafcc4aef38c1dcb3a15cd2087de77438e66c4e7e9984fbaefc6865520273f9","first_computed_at":"2026-07-05T03:55:15.222666Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:55:15.222666Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SK4ybcfHKpi8HHZg5Ve5eVpPSxJUstKRmZWX5wQGCVVjjSkhvtc4OLsOT/pnZjx/Jizgg3sGVLrvXVjVElHLBg==","signature_status":"signed_v1","signed_at":"2026-07-05T03:55:15.223233Z","signed_message":"canonical_sha256_bytes"},"source_id":"2112.09210","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d0ed11e251e757ad621985caedcc32690b896bf943269217c54d2aaeba284d3d","sha256:40b273fe608f5eee2ec0396a366cf31e73d89aaa15b9f2a499fbd29fda25d32c"],"state_sha256":"3e47fb0ed1639f2d28f7e9b79bff9447e35326e521d15a3c757e5a3ebfd09f9a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Bce3DjrTJ0l7+4gfrYQSSqdQFaDRQIpUBgRNUZw8tq2R0xTqhdOlKPUELIAdsBIXiYWvlH0NeUMVOBe1AsiGDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-21T06:11:15.030618Z","bundle_sha256":"1eb513c03fcab6fc33ca23d7ac9b435737a72dd3ecd63d7c959b580ef9a048ec"}}