{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:SY72BFHNPSUBPBBBOXXAVDAGXU","short_pith_number":"pith:SY72BFHN","canonical_record":{"source":{"id":"1904.12560","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2019-04-29T11:24:00Z","cross_cats_sorted":[],"title_canon_sha256":"9a7a1a554d3df5032562ac9e03711c8490ca4038c9de7e6b19a6f9f27ce146b0","abstract_canon_sha256":"05c70e8b290de8e2973b2aed3cf4f707b819a441a6fcdb8b0f1db5cb9675fd3a"},"schema_version":"1.0"},"canonical_sha256":"963fa094ed7ca817842175ee0a8c06bd16385a49187faf134316ca6d3a5338e9","source":{"kind":"arxiv","id":"1904.12560","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.12560","created_at":"2026-05-17T23:47:34Z"},{"alias_kind":"arxiv_version","alias_value":"1904.12560v1","created_at":"2026-05-17T23:47:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.12560","created_at":"2026-05-17T23:47:34Z"},{"alias_kind":"pith_short_12","alias_value":"SY72BFHNPSUB","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_16","alias_value":"SY72BFHNPSUBPBBB","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_8","alias_value":"SY72BFHN","created_at":"2026-05-18T12:33:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:SY72BFHNPSUBPBBBOXXAVDAGXU","target":"record","payload":{"canonical_record":{"source":{"id":"1904.12560","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2019-04-29T11:24:00Z","cross_cats_sorted":[],"title_canon_sha256":"9a7a1a554d3df5032562ac9e03711c8490ca4038c9de7e6b19a6f9f27ce146b0","abstract_canon_sha256":"05c70e8b290de8e2973b2aed3cf4f707b819a441a6fcdb8b0f1db5cb9675fd3a"},"schema_version":"1.0"},"canonical_sha256":"963fa094ed7ca817842175ee0a8c06bd16385a49187faf134316ca6d3a5338e9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:47:34.837615Z","signature_b64":"8G6qoR0nLup6RJLmvqg1AjTbYZII4mKBVb8AJLLc6G4jNafeTdIQwI8vHf+OTthlNxD0InUa3X0UCD7ISsl6Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"963fa094ed7ca817842175ee0a8c06bd16385a49187faf134316ca6d3a5338e9","last_reissued_at":"2026-05-17T23:47:34.836973Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:47:34.836973Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1904.12560","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":"2026-05-17T23:47:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xaCSHhpAW2NUgnmYDRiTPyoRyIdLk6ObBuvIaR5p3fCHcNXHM+xGMFn/+WIM70A6AJ/d6T0dWT/0owB76a4KBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T06:19:42.443491Z"},"content_sha256":"12c7a07f5a4d6b290cb7f421308bb43a8b2bc28fd36c02a242984cb2895e8c7a","schema_version":"1.0","event_id":"sha256:12c7a07f5a4d6b290cb7f421308bb43a8b2bc28fd36c02a242984cb2895e8c7a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:SY72BFHNPSUBPBBBOXXAVDAGXU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Measurement of the Helicity Asymmetry $E$ for the reaction $ \\gamma p\\to \\pi^0 p$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. Gridnev, A. Sarantsev, A. Thiel, A.V. Anisovich, A. Wilson, A. Winnebeck, B. Krusche, CBELSA/TAPS collaboration: M. Gottschall, Ch. Hammann, Ch. Honisch, Ch. Schmidt, Ch. Wendel, D. Bayadilov, D. Elsner, D. Piontek, D. Walther, D. Werthm\\\"uller, E. Gutz, E. Klempt, F. Afzal, F. Dietz, F. Frommberger, F. Klein, G. Reicherz, H. Dutz, H. Eberhardt, H. Kalinowsky, H. Schmieden, H. van Pee, I. Keshelashvili, I. Lopatin, J. Hannappel, J. Hartmann, J. M\\\"uller, J. M\\\"ullers, K. Fornet-Ponse, K. Koop, K. Makonyi, K. Spieker, K.-Th. Brinkmann, L. Witthauer, M. Bichow, M. Dieterle, M. Gr\\\"uner, M. Kube, M. Lang, M. Nanova, M. Urban, Ph. Hoffmeister, P. Klassen, P. Mahlberg, R. Beck, R. Ewald, R. Novotny, S. Kammer, St. Friedrich, T. Jude, T. Rostomyan, T. Seifen, U. Thoma, U. Wiedner, V. Crede, V. Metag, V. Nikonov, V. Sokhoyan, W. Hillert, W. Meyer, Y. Wunderlich","submitted_at":"2019-04-29T11:24:00Z","abstract_excerpt":"A measurement of the double-polarization observable $E$ for the reaction $\\gamma p\\to \\pi^0 p$ is reported. The data were taken with the CBELSA/TAPS experiment at the ELSA facility in Bonn using the Bonn frozen-spin butanol (C$_4$H$_9$OH) target, which provided longitudinally-polarized protons. Circularly-polarized photons were produced via bremsstrahlung of longitudinally-polarized electrons. The data cover the photon energy range from $E_\\gamma =600$~MeV to $E_\\gamma =2310$~MeV and nearly the complete angular range. The results are compared to and have been included in recent partial wave an"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.12560","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":""},"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":"2026-05-17T23:47:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sVpnHmroH3Gh5+Ke4RTshsWxadQM0/DfPQcu9cj2zFrN+tKxxIXeN8yFzRJ5MG80XJJ2OFTNHcOlgT3+w2Q1Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T06:19:42.443950Z"},"content_sha256":"3beaab8c2aaecbddd23c2ed97658f827d89fa15ab28608311f91725f40f56b30","schema_version":"1.0","event_id":"sha256:3beaab8c2aaecbddd23c2ed97658f827d89fa15ab28608311f91725f40f56b30"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SY72BFHNPSUBPBBBOXXAVDAGXU/bundle.json","state_url":"https://pith.science/pith/SY72BFHNPSUBPBBBOXXAVDAGXU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SY72BFHNPSUBPBBBOXXAVDAGXU/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":"2026-08-05T06:19:42Z","links":{"resolver":"https://pith.science/pith/SY72BFHNPSUBPBBBOXXAVDAGXU","bundle":"https://pith.science/pith/SY72BFHNPSUBPBBBOXXAVDAGXU/bundle.json","state":"https://pith.science/pith/SY72BFHNPSUBPBBBOXXAVDAGXU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SY72BFHNPSUBPBBBOXXAVDAGXU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:SY72BFHNPSUBPBBBOXXAVDAGXU","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":"05c70e8b290de8e2973b2aed3cf4f707b819a441a6fcdb8b0f1db5cb9675fd3a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2019-04-29T11:24:00Z","title_canon_sha256":"9a7a1a554d3df5032562ac9e03711c8490ca4038c9de7e6b19a6f9f27ce146b0"},"schema_version":"1.0","source":{"id":"1904.12560","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.12560","created_at":"2026-05-17T23:47:34Z"},{"alias_kind":"arxiv_version","alias_value":"1904.12560v1","created_at":"2026-05-17T23:47:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.12560","created_at":"2026-05-17T23:47:34Z"},{"alias_kind":"pith_short_12","alias_value":"SY72BFHNPSUB","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_16","alias_value":"SY72BFHNPSUBPBBB","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_8","alias_value":"SY72BFHN","created_at":"2026-05-18T12:33:27Z"}],"graph_snapshots":[{"event_id":"sha256:3beaab8c2aaecbddd23c2ed97658f827d89fa15ab28608311f91725f40f56b30","target":"graph","created_at":"2026-05-17T23:47:34Z","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":"A measurement of the double-polarization observable $E$ for the reaction $\\gamma p\\to \\pi^0 p$ is reported. The data were taken with the CBELSA/TAPS experiment at the ELSA facility in Bonn using the Bonn frozen-spin butanol (C$_4$H$_9$OH) target, which provided longitudinally-polarized protons. Circularly-polarized photons were produced via bremsstrahlung of longitudinally-polarized electrons. The data cover the photon energy range from $E_\\gamma =600$~MeV to $E_\\gamma =2310$~MeV and nearly the complete angular range. The results are compared to and have been included in recent partial wave an","authors_text":"A. Gridnev, A. Sarantsev, A. Thiel, A.V. Anisovich, A. Wilson, A. Winnebeck, B. Krusche, CBELSA/TAPS collaboration: M. Gottschall, Ch. Hammann, Ch. Honisch, Ch. Schmidt, Ch. Wendel, D. Bayadilov, D. Elsner, D. Piontek, D. Walther, D. Werthm\\\"uller, E. Gutz, E. Klempt, F. Afzal, F. Dietz, F. Frommberger, F. Klein, G. Reicherz, H. Dutz, H. Eberhardt, H. Kalinowsky, H. Schmieden, H. van Pee, I. Keshelashvili, I. Lopatin, J. Hannappel, J. Hartmann, J. M\\\"uller, J. M\\\"ullers, K. Fornet-Ponse, K. Koop, K. Makonyi, K. Spieker, K.-Th. Brinkmann, L. Witthauer, M. Bichow, M. Dieterle, M. Gr\\\"uner, M. Kube, M. Lang, M. Nanova, M. Urban, Ph. Hoffmeister, P. Klassen, P. Mahlberg, R. Beck, R. Ewald, R. Novotny, S. Kammer, St. Friedrich, T. Jude, T. Rostomyan, T. Seifen, U. Thoma, U. Wiedner, V. Crede, V. Metag, V. Nikonov, V. Sokhoyan, W. Hillert, W. Meyer, Y. Wunderlich","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2019-04-29T11:24:00Z","title":"Measurement of the Helicity Asymmetry $E$ for the reaction $ \\gamma p\\to \\pi^0 p$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.12560","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":"sha256:12c7a07f5a4d6b290cb7f421308bb43a8b2bc28fd36c02a242984cb2895e8c7a","target":"record","created_at":"2026-05-17T23:47:34Z","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":"05c70e8b290de8e2973b2aed3cf4f707b819a441a6fcdb8b0f1db5cb9675fd3a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2019-04-29T11:24:00Z","title_canon_sha256":"9a7a1a554d3df5032562ac9e03711c8490ca4038c9de7e6b19a6f9f27ce146b0"},"schema_version":"1.0","source":{"id":"1904.12560","kind":"arxiv","version":1}},"canonical_sha256":"963fa094ed7ca817842175ee0a8c06bd16385a49187faf134316ca6d3a5338e9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"963fa094ed7ca817842175ee0a8c06bd16385a49187faf134316ca6d3a5338e9","first_computed_at":"2026-05-17T23:47:34.836973Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:47:34.836973Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8G6qoR0nLup6RJLmvqg1AjTbYZII4mKBVb8AJLLc6G4jNafeTdIQwI8vHf+OTthlNxD0InUa3X0UCD7ISsl6Cw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:47:34.837615Z","signed_message":"canonical_sha256_bytes"},"source_id":"1904.12560","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:12c7a07f5a4d6b290cb7f421308bb43a8b2bc28fd36c02a242984cb2895e8c7a","sha256:3beaab8c2aaecbddd23c2ed97658f827d89fa15ab28608311f91725f40f56b30"],"state_sha256":"a38c084ffaf460b4c80cd9deb0c3e39ff2d3c814cd1dd20a4235edc8ebb82b39"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WGNDdem3WXIAS9wUN0VoJozkB24aq/fKOW4TZJ0h+qREXskDIh538wGCgZLF63RlP6C51q4BQjb3rVCkU/AaCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T06:19:42.448786Z","bundle_sha256":"b3fcf62ce889a143c6fe0431232de3d9e6bb8f5b4fd9b38351e96b2cdfbe0570"}}