{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:NIBPEAZCKZLJMEPL4Q42CPZVAN","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":"6104ceb78f96b2639953678c31678586fe90846b1b9df0184a172c96f1ef5535","cross_cats_sorted":["hep-ex","nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2025-08-26T09:30:31Z","title_canon_sha256":"d6c45c3efb329a3a3f3ae20169d272842237ff1a2024b9d278697b2382b9ba45"},"schema_version":"1.0","source":{"id":"2508.18851","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2508.18851","created_at":"2026-07-05T11:59:32Z"},{"alias_kind":"arxiv_version","alias_value":"2508.18851v1","created_at":"2026-07-05T11:59:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2508.18851","created_at":"2026-07-05T11:59:32Z"},{"alias_kind":"pith_short_12","alias_value":"NIBPEAZCKZLJ","created_at":"2026-07-05T11:59:32Z"},{"alias_kind":"pith_short_16","alias_value":"NIBPEAZCKZLJMEPL","created_at":"2026-07-05T11:59:32Z"},{"alias_kind":"pith_short_8","alias_value":"NIBPEAZC","created_at":"2026-07-05T11:59:32Z"}],"graph_snapshots":[{"event_id":"sha256:d6316214a7ae249ba2942fee483087d49c6578038aa9b05662ef2bf5bcd49a09","target":"graph","created_at":"2026-07-05T11:59:32Z","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/2508.18851/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"A longstanding discrepancy between measured and predicted beam-normal single-spin asymmetries $A_{n}$ in elastic electron scattering off $^{208}$Pb has challenged our understanding of two-photon exchange (TPE) in heavy nuclei. We report a new measurement at 570 MeV and $Q^2$=0.04 $GeV^2$/$c^2$, yielding$A_n = (-9.1 \\pm 2.1~\\text{(stat)} \\pm 0.7~\\text{(syst)})~\\mathrm{ppm}$. This nonzero value contrasts with previous results at higher energies and suggests a kinematic dependence of TPE effects not captured by current theory, prompting a reevaluation of earlier interpretations.","authors_text":"A. Del Vincio, A. Esser, B. S. Schlimme, C. Sfienti, F. Keil, F. Maas, H. Merkel, J. Pochodzalla, K. Aulenbacher, L. Doria, L. Wilhelm, M. Dehn, M. Hoek, M. Mihovilovic, M. Thiel, N. Kozyrev, S. Baunack, S. Stengel, T. Shao, U. M\\\"uller","cross_cats":["hep-ex","nucl-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2025-08-26T09:30:31Z","title":"Beam-Normal Single-Spin Asymmetry in $^{208}$Pb at low energy: discrepancy resolved or new kinematic puzzle?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2508.18851","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:c9d67f7e78bdc55b1bed8e9e7fe5fdbd1a1f430783a6925c77aaff676cab3a68","target":"record","created_at":"2026-07-05T11:59:32Z","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":"6104ceb78f96b2639953678c31678586fe90846b1b9df0184a172c96f1ef5535","cross_cats_sorted":["hep-ex","nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2025-08-26T09:30:31Z","title_canon_sha256":"d6c45c3efb329a3a3f3ae20169d272842237ff1a2024b9d278697b2382b9ba45"},"schema_version":"1.0","source":{"id":"2508.18851","kind":"arxiv","version":1}},"canonical_sha256":"6a02f2032256569611ebe439a13f3503422d6519683560966421cde650e1090b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6a02f2032256569611ebe439a13f3503422d6519683560966421cde650e1090b","first_computed_at":"2026-07-05T11:59:32.360496Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:59:32.360496Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"AnzZg3sHE6H5s31ASQ1/YjwKwmoIU6Tu75HegLj+ONKSZJ1lRTk9WZ3p+KUsZ8DH465MFjnRwEp96teYt+uNBw==","signature_status":"signed_v1","signed_at":"2026-07-05T11:59:32.361001Z","signed_message":"canonical_sha256_bytes"},"source_id":"2508.18851","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c9d67f7e78bdc55b1bed8e9e7fe5fdbd1a1f430783a6925c77aaff676cab3a68","sha256:d6316214a7ae249ba2942fee483087d49c6578038aa9b05662ef2bf5bcd49a09"],"state_sha256":"2cae3b2e20ef5a704a48135029994e4e04bd7a5c3c52c375e47bf284999cd113"}