{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:OCYN2NFC3KIAO2KPZUVX4YO374","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":"aacbab139931bda9514e55ee02ffa372092f84a949366e1b7e672ea7b2624ac2","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"nucl-ex","submitted_at":"2022-11-17T17:29:38Z","title_canon_sha256":"d062a85a2a108e373fd93c5df03e055a1b0b3251e4ce27dd9c6d73b62f271ffd"},"schema_version":"1.0","source":{"id":"2211.09688","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2211.09688","created_at":"2026-07-05T05:17:05Z"},{"alias_kind":"arxiv_version","alias_value":"2211.09688v1","created_at":"2026-07-05T05:17:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2211.09688","created_at":"2026-07-05T05:17:05Z"},{"alias_kind":"pith_short_12","alias_value":"OCYN2NFC3KIA","created_at":"2026-07-05T05:17:05Z"},{"alias_kind":"pith_short_16","alias_value":"OCYN2NFC3KIAO2KP","created_at":"2026-07-05T05:17:05Z"},{"alias_kind":"pith_short_8","alias_value":"OCYN2NFC","created_at":"2026-07-05T05:17:05Z"}],"graph_snapshots":[{"event_id":"sha256:31cf901e3e938b0fe685c2f24f297d428a33660befbe54dd833b66827d9da7c3","target":"graph","created_at":"2026-07-05T05:17:05Z","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/2211.09688/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We report a first measurement of the double-polarisation observable, $C_{x'}$, in $\\pi^+$ photoproduction off the proton. The $C_{x'}$ double-polarisation observable represents the transfer of polarisation from a circularly polarised photon beam to the recoiling neutron. The MAMI circularly polarised photon beam impinged on a liquid deuterium target cell, with reaction products detected in the Crystal Ball calorimeter. Ancillary apparatus surrounding the target provided tracking, particle identification and determination of recoil nucleon polarisation. The $C_{x'}$ observable is determined for","authors_text":"A. Braghieri, A. Denig, A. Fix, A. Lazarev, A. Neganov, A. Neiser, A. Thiel, A. Thomas, B. Krusche, C. Collicott, C. Mullen, C. S. Akondi, D. Ghosal, D. Gurevich, D. Hornidge, D. I. Glazier, D. M. Manley, D. Paudyal, D. P. Watts, E. J. Downie, E. Mornacchi, F. Afzal, F. Cividini, G. M. Huber, I. Gorodnov, I. I. Strakovsky, I. J. D. MacGregor, I. Supek, J. R. M. Annand, J. Wettig, K. Livingston, K. Spieker, L. Heijkenskj\\\"old, M. Bashkanov, M. Biroth, M. Korolija, M. Ostrick, M. Thiel, M. Wolfes, N. Borisov, N. K. Walford, N. Zachariou, O. Steffen, P. Achenbach, P. Adlarson, P. B. Otte, P. Drexler, P. Pedroni, P. P. Martel, R. Beck, R. Miskimen, S. Abt, S. Costanza, S. Fegan, S. Gardner, S. J. D. Kay, S. Lutterer, S. Wagner, T. Rostomyan, T. Strub, V. L. Kashevarov, V. Sokhoyan, W. Gradl, W. J. Briscoe, Yu. A. Usov, Z. Ahmed","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"nucl-ex","submitted_at":"2022-11-17T17:29:38Z","title":"Neutron polarisation transfer, $C_{x'}^n$, in $\\pi^+$ photoproduction off the proton"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2211.09688","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":"sha256:460281d65a3c3afb153a6e6282fca01de7677e92223b3030f8a1eae886f5d803","target":"record","created_at":"2026-07-05T05:17:05Z","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":"aacbab139931bda9514e55ee02ffa372092f84a949366e1b7e672ea7b2624ac2","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"nucl-ex","submitted_at":"2022-11-17T17:29:38Z","title_canon_sha256":"d062a85a2a108e373fd93c5df03e055a1b0b3251e4ce27dd9c6d73b62f271ffd"},"schema_version":"1.0","source":{"id":"2211.09688","kind":"arxiv","version":1}},"canonical_sha256":"70b0dd34a2da9007694fcd2b7e61dbff2e316f0b99830ca54da452bb124968eb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"70b0dd34a2da9007694fcd2b7e61dbff2e316f0b99830ca54da452bb124968eb","first_computed_at":"2026-07-05T05:17:05.338938Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T05:17:05.338938Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+dWEpbFLADj7pBW7waJKN/Nzlv2vekFP3Pncolu1/jhRwuBAqgsawoA7GmwWdBXtNKewhbOnP3rbi2o42tjBCw==","signature_status":"signed_v1","signed_at":"2026-07-05T05:17:05.339424Z","signed_message":"canonical_sha256_bytes"},"source_id":"2211.09688","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:460281d65a3c3afb153a6e6282fca01de7677e92223b3030f8a1eae886f5d803","sha256:31cf901e3e938b0fe685c2f24f297d428a33660befbe54dd833b66827d9da7c3"],"state_sha256":"c890fa3c7bfc84b0d8252860cbc26e6077ea2aa1e7d629b1cb3c91d2a1c27fe1"}