{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:SY72BFHNPSUBPBBBOXXAVDAGXU","short_pith_number":"pith:SY72BFHN","schema_version":"1.0","canonical_sha256":"963fa094ed7ca817842175ee0a8c06bd16385a49187faf134316ca6d3a5338e9","source":{"kind":"arxiv","id":"1904.12560","version":1},"attestation_state":"computed","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"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"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"},"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"},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1904.12560","created_at":"2026-05-17T23:47:34.837073+00:00"},{"alias_kind":"arxiv_version","alias_value":"1904.12560v1","created_at":"2026-05-17T23:47:34.837073+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.12560","created_at":"2026-05-17T23:47:34.837073+00:00"},{"alias_kind":"pith_short_12","alias_value":"SY72BFHNPSUB","created_at":"2026-05-18T12:33:27.125529+00:00"},{"alias_kind":"pith_short_16","alias_value":"SY72BFHNPSUBPBBB","created_at":"2026-05-18T12:33:27.125529+00:00"},{"alias_kind":"pith_short_8","alias_value":"SY72BFHN","created_at":"2026-05-18T12:33:27.125529+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/SY72BFHNPSUBPBBBOXXAVDAGXU","json":"https://pith.science/pith/SY72BFHNPSUBPBBBOXXAVDAGXU.json","graph_json":"https://pith.science/api/pith-number/SY72BFHNPSUBPBBBOXXAVDAGXU/graph.json","events_json":"https://pith.science/api/pith-number/SY72BFHNPSUBPBBBOXXAVDAGXU/events.json","paper":"https://pith.science/paper/SY72BFHN"},"agent_actions":{"view_html":"https://pith.science/pith/SY72BFHNPSUBPBBBOXXAVDAGXU","download_json":"https://pith.science/pith/SY72BFHNPSUBPBBBOXXAVDAGXU.json","view_paper":"https://pith.science/paper/SY72BFHN","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1904.12560&json=true","fetch_graph":"https://pith.science/api/pith-number/SY72BFHNPSUBPBBBOXXAVDAGXU/graph.json","fetch_events":"https://pith.science/api/pith-number/SY72BFHNPSUBPBBBOXXAVDAGXU/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/SY72BFHNPSUBPBBBOXXAVDAGXU/action/timestamp_anchor","attest_storage":"https://pith.science/pith/SY72BFHNPSUBPBBBOXXAVDAGXU/action/storage_attestation","attest_author":"https://pith.science/pith/SY72BFHNPSUBPBBBOXXAVDAGXU/action/author_attestation","sign_citation":"https://pith.science/pith/SY72BFHNPSUBPBBBOXXAVDAGXU/action/citation_signature","submit_replication":"https://pith.science/pith/SY72BFHNPSUBPBBBOXXAVDAGXU/action/replication_record"}},"created_at":"2026-05-17T23:47:34.837073+00:00","updated_at":"2026-05-17T23:47:34.837073+00:00"}