{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:ZJOMCZC6TSJCULBL6BJE3SVGJP","short_pith_number":"pith:ZJOMCZC6","canonical_record":{"source":{"id":"1706.05849","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2017-06-19T09:37:08Z","cross_cats_sorted":["nucl-th"],"title_canon_sha256":"08294363ca35d28868a998f5bace87b6eed7fe2ad5cc6972e1150a2027792960","abstract_canon_sha256":"52bf089d40e605e5efaaf9dfa8a595e23bb43219816195a3182def368dcf54f5"},"schema_version":"1.0"},"canonical_sha256":"ca5cc1645e9c922a2c2bf0524dcaa64bf33c57918cf7e777ba7e020198bb2752","source":{"kind":"arxiv","id":"1706.05849","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1706.05849","created_at":"2026-05-18T00:36:31Z"},{"alias_kind":"arxiv_version","alias_value":"1706.05849v2","created_at":"2026-05-18T00:36:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1706.05849","created_at":"2026-05-18T00:36:31Z"},{"alias_kind":"pith_short_12","alias_value":"ZJOMCZC6TSJC","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_16","alias_value":"ZJOMCZC6TSJCULBL","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_8","alias_value":"ZJOMCZC6","created_at":"2026-05-18T12:31:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:ZJOMCZC6TSJCULBL6BJE3SVGJP","target":"record","payload":{"canonical_record":{"source":{"id":"1706.05849","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2017-06-19T09:37:08Z","cross_cats_sorted":["nucl-th"],"title_canon_sha256":"08294363ca35d28868a998f5bace87b6eed7fe2ad5cc6972e1150a2027792960","abstract_canon_sha256":"52bf089d40e605e5efaaf9dfa8a595e23bb43219816195a3182def368dcf54f5"},"schema_version":"1.0"},"canonical_sha256":"ca5cc1645e9c922a2c2bf0524dcaa64bf33c57918cf7e777ba7e020198bb2752","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:36:31.162997Z","signature_b64":"nPfGpLuaTz8c0ApbFx+QqSPBGbw7sT/aE9Oz2Ul0gEt8zFFzHv4+vfNHAd0QBLiZ5ZzMbbFx0u8XcJwzlhSDAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ca5cc1645e9c922a2c2bf0524dcaa64bf33c57918cf7e777ba7e020198bb2752","last_reissued_at":"2026-05-18T00:36:31.162456Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:36:31.162456Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1706.05849","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":"2026-05-18T00:36:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RpDfFuQL7PxboVDjZh5Cho9z/2k1nPifjQqAXr1+HGqAylycE4T4MZQIspd9VS65s5cO94GrK/PEp3fDMYISDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T14:35:01.372518Z"},"content_sha256":"2a3f8d3c2c0d3a7711eda9ef3e099cddf35a1f9af22f5227fa0fcb055d6e22ae","schema_version":"1.0","event_id":"sha256:2a3f8d3c2c0d3a7711eda9ef3e099cddf35a1f9af22f5227fa0fcb055d6e22ae"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:ZJOMCZC6TSJCULBL6BJE3SVGJP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Violation of Positivity Bounds in Models of Generalized Parton Distributions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-th"],"primary_cat":"hep-ph","authors_text":"Brian C. Tiburzi, Gaurav Verma","submitted_at":"2017-06-19T09:37:08Z","abstract_excerpt":"As with parton distributions, flexible phenomenological parameterizations of generalized parton distributions (GPDs) are essential for their extraction from data. The large number of constraints imposed on GPDs make simple Lorentz covariant models viable; but, such models are often incomplete in that they employ the impulse approximation. Using the GPD of the pion as a test case, we show that the impulse approximation can lead to violation of the positivity bound required of GPDs. We focus on a particular model of the pion bound-state vertex that was recently proposed and demonstrate that sati"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1706.05849","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":""},"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":"2026-05-18T00:36:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LSWPvHUkqvu0p2EhNzu+gqdqOcr0H3DDk4b173IWVOTZmWzVp7Hut97u8zqw1UL09O9/7PTa4Ubi5ll02kXmCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T14:35:01.372864Z"},"content_sha256":"8c38167b00968dafe30144399caf17e1ca1902c9914da4f9d4d17656dec95282","schema_version":"1.0","event_id":"sha256:8c38167b00968dafe30144399caf17e1ca1902c9914da4f9d4d17656dec95282"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZJOMCZC6TSJCULBL6BJE3SVGJP/bundle.json","state_url":"https://pith.science/pith/ZJOMCZC6TSJCULBL6BJE3SVGJP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZJOMCZC6TSJCULBL6BJE3SVGJP/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":"2026-06-28T14:35:01Z","links":{"resolver":"https://pith.science/pith/ZJOMCZC6TSJCULBL6BJE3SVGJP","bundle":"https://pith.science/pith/ZJOMCZC6TSJCULBL6BJE3SVGJP/bundle.json","state":"https://pith.science/pith/ZJOMCZC6TSJCULBL6BJE3SVGJP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZJOMCZC6TSJCULBL6BJE3SVGJP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:ZJOMCZC6TSJCULBL6BJE3SVGJP","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":"52bf089d40e605e5efaaf9dfa8a595e23bb43219816195a3182def368dcf54f5","cross_cats_sorted":["nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2017-06-19T09:37:08Z","title_canon_sha256":"08294363ca35d28868a998f5bace87b6eed7fe2ad5cc6972e1150a2027792960"},"schema_version":"1.0","source":{"id":"1706.05849","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1706.05849","created_at":"2026-05-18T00:36:31Z"},{"alias_kind":"arxiv_version","alias_value":"1706.05849v2","created_at":"2026-05-18T00:36:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1706.05849","created_at":"2026-05-18T00:36:31Z"},{"alias_kind":"pith_short_12","alias_value":"ZJOMCZC6TSJC","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_16","alias_value":"ZJOMCZC6TSJCULBL","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_8","alias_value":"ZJOMCZC6","created_at":"2026-05-18T12:31:59Z"}],"graph_snapshots":[{"event_id":"sha256:8c38167b00968dafe30144399caf17e1ca1902c9914da4f9d4d17656dec95282","target":"graph","created_at":"2026-05-18T00:36:31Z","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":"As with parton distributions, flexible phenomenological parameterizations of generalized parton distributions (GPDs) are essential for their extraction from data. The large number of constraints imposed on GPDs make simple Lorentz covariant models viable; but, such models are often incomplete in that they employ the impulse approximation. Using the GPD of the pion as a test case, we show that the impulse approximation can lead to violation of the positivity bound required of GPDs. We focus on a particular model of the pion bound-state vertex that was recently proposed and demonstrate that sati","authors_text":"Brian C. Tiburzi, Gaurav Verma","cross_cats":["nucl-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2017-06-19T09:37:08Z","title":"Violation of Positivity Bounds in Models of Generalized Parton Distributions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1706.05849","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":"sha256:2a3f8d3c2c0d3a7711eda9ef3e099cddf35a1f9af22f5227fa0fcb055d6e22ae","target":"record","created_at":"2026-05-18T00:36:31Z","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":"52bf089d40e605e5efaaf9dfa8a595e23bb43219816195a3182def368dcf54f5","cross_cats_sorted":["nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2017-06-19T09:37:08Z","title_canon_sha256":"08294363ca35d28868a998f5bace87b6eed7fe2ad5cc6972e1150a2027792960"},"schema_version":"1.0","source":{"id":"1706.05849","kind":"arxiv","version":2}},"canonical_sha256":"ca5cc1645e9c922a2c2bf0524dcaa64bf33c57918cf7e777ba7e020198bb2752","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ca5cc1645e9c922a2c2bf0524dcaa64bf33c57918cf7e777ba7e020198bb2752","first_computed_at":"2026-05-18T00:36:31.162456Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:36:31.162456Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nPfGpLuaTz8c0ApbFx+QqSPBGbw7sT/aE9Oz2Ul0gEt8zFFzHv4+vfNHAd0QBLiZ5ZzMbbFx0u8XcJwzlhSDAA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:36:31.162997Z","signed_message":"canonical_sha256_bytes"},"source_id":"1706.05849","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2a3f8d3c2c0d3a7711eda9ef3e099cddf35a1f9af22f5227fa0fcb055d6e22ae","sha256:8c38167b00968dafe30144399caf17e1ca1902c9914da4f9d4d17656dec95282"],"state_sha256":"7ea9923282b2b05f1ee5de99fb09fefdb83c8e222de4ab2633abec7efecf39cf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WtwEunRBIRcJ5vysgmtl1gitM1u8C28+OGso0uFBHltC8svGXggPVLlrWeKZO8EHWYO0sRaE7U30qpw7D6YGBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-28T14:35:01.374713Z","bundle_sha256":"524767c507050ff01420a7202e802035912b83a7300646aa692251ba8838e1da"}}