{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1995:KVDQ2JXKFIQMTI7IFNB7XHZ54G","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":"80fd44daaa23a9f75da0e6d428d5257469d0d6d2f691fc19d4d298a768ff339a","cross_cats_sorted":[],"license":"","primary_cat":"hep-ex","submitted_at":"1995-07-19T21:46:24Z","title_canon_sha256":"f3c8a4ad79d370ee2a5e7fe69b0faa9b8bb1cdaeb2725b09cc49e0fe118df8c0"},"schema_version":"1.0","source":{"id":"hep-ex/9507011","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-ex/9507011","created_at":"2026-05-18T03:47:21Z"},{"alias_kind":"arxiv_version","alias_value":"hep-ex/9507011v2","created_at":"2026-05-18T03:47:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-ex/9507011","created_at":"2026-05-18T03:47:21Z"},{"alias_kind":"pith_short_12","alias_value":"KVDQ2JXKFIQM","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_16","alias_value":"KVDQ2JXKFIQMTI7I","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_8","alias_value":"KVDQ2JXK","created_at":"2026-05-18T12:25:47Z"}],"graph_snapshots":[{"event_id":"sha256:2d1e64cbfda4cc2e179c7e7d2a8d434f3628631449990a35817ff14af90fd157","target":"graph","created_at":"2026-05-18T03:47:21Z","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":"Elastic $\\rho^0$ photoproduction has been measured using the ZEUS detector at HERA. Untagged photoproduction events from $ep$ interactions were used to measure the reaction $\\gamma p \\rightarrow \\rho^0 p$ ($\\rho^0 \\rightarrow \\pi^+ \\pi^-$) at photon-proton centre-of-mass energies between 60 and 80~GeV and $|t|<0.5$~GeV$^2$, where $t$ is the square of the four-momentum transferred at the proton vertex. The differential cross section $d\\sigma/dM_{\\pi\\pi}$, where $M_{\\pi\\pi}$ is the invariant mass of the two pions, and the integrated cross section, $\\sigma_{\\gamma p\\rightarrow \\rho^0 p}$, are pre","authors_text":"the ZEUS Collaboration","cross_cats":[],"headline":"","license":"","primary_cat":"hep-ex","submitted_at":"1995-07-19T21:46:24Z","title":"Measurement of Elastic $\\rho^0$ Photoproduction at HERA"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ex/9507011","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":"sha256:6569df2a1f26a02b9d667befae65d0049609665cd3991bf62b18171eeae80b31","target":"record","created_at":"2026-05-18T03:47:21Z","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":"80fd44daaa23a9f75da0e6d428d5257469d0d6d2f691fc19d4d298a768ff339a","cross_cats_sorted":[],"license":"","primary_cat":"hep-ex","submitted_at":"1995-07-19T21:46:24Z","title_canon_sha256":"f3c8a4ad79d370ee2a5e7fe69b0faa9b8bb1cdaeb2725b09cc49e0fe118df8c0"},"schema_version":"1.0","source":{"id":"hep-ex/9507011","kind":"arxiv","version":2}},"canonical_sha256":"55470d26ea2a20c9a3e82b43fb9f3de18cbdb19d4cce7929377b97bfa04c44da","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"55470d26ea2a20c9a3e82b43fb9f3de18cbdb19d4cce7929377b97bfa04c44da","first_computed_at":"2026-05-18T03:47:21.920046Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:47:21.920046Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"IT/cu7bNJ8v5kyCSjmjFbyJ5XolU5UACew9ZdeMoVyEeJBCn78ZyKueS6r9XTmQ4sOSL/N4TbNXDTlpZRennDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:47:21.920747Z","signed_message":"canonical_sha256_bytes"},"source_id":"hep-ex/9507011","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6569df2a1f26a02b9d667befae65d0049609665cd3991bf62b18171eeae80b31","sha256:2d1e64cbfda4cc2e179c7e7d2a8d434f3628631449990a35817ff14af90fd157"],"state_sha256":"d9b17d3fa1ea41ffb8907b6b2aa0cb292afa25a59e9262abfa74b27b52434418"}