{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1998:KXMEZO73DFXEKTREIOWE456F2H","short_pith_number":"pith:KXMEZO73","canonical_record":{"source":{"id":"hep-ph/9812458","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-ph","submitted_at":"1998-12-21T15:12:24Z","cross_cats_sorted":[],"title_canon_sha256":"6e3139f3bfa441203f2b810cbee3c354824270a91523b55ebaf23eef1ca87954","abstract_canon_sha256":"817736f7a7dc7e53cee8e947f88f038a9b543114ddfc5cd0ddfcea9b6e2cad48"},"schema_version":"1.0"},"canonical_sha256":"55d84cbbfb196e454e2443ac4e77c5d1fabcc40a1b9f0d1bf4767c42bc2b7276","source":{"kind":"arxiv","id":"hep-ph/9812458","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-ph/9812458","created_at":"2026-05-18T04:13:17Z"},{"alias_kind":"arxiv_version","alias_value":"hep-ph/9812458v1","created_at":"2026-05-18T04:13:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-ph/9812458","created_at":"2026-05-18T04:13:17Z"},{"alias_kind":"pith_short_12","alias_value":"KXMEZO73DFXE","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"KXMEZO73DFXEKTRE","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"KXMEZO73","created_at":"2026-05-18T12:25:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1998:KXMEZO73DFXEKTREIOWE456F2H","target":"record","payload":{"canonical_record":{"source":{"id":"hep-ph/9812458","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-ph","submitted_at":"1998-12-21T15:12:24Z","cross_cats_sorted":[],"title_canon_sha256":"6e3139f3bfa441203f2b810cbee3c354824270a91523b55ebaf23eef1ca87954","abstract_canon_sha256":"817736f7a7dc7e53cee8e947f88f038a9b543114ddfc5cd0ddfcea9b6e2cad48"},"schema_version":"1.0"},"canonical_sha256":"55d84cbbfb196e454e2443ac4e77c5d1fabcc40a1b9f0d1bf4767c42bc2b7276","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:13:17.781810Z","signature_b64":"Ck+je/BBnlcdAnkSPvO15H5mNxC0n3eiaPp60yPQnxtO+kb6P4eZL34RNiPR25ieEkP9CHyvTRvcApZjOIDgCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"55d84cbbfb196e454e2443ac4e77c5d1fabcc40a1b9f0d1bf4767c42bc2b7276","last_reissued_at":"2026-05-18T04:13:17.781305Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:13:17.781305Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"hep-ph/9812458","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":"2026-05-18T04:13:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yKwFGpyiwyBiBYQJjcLC5dwB7MccVNoBxUms5z4B5YAuF7yCyaB2pzqgwaAO3akK2T/Mo/QcymTiA/lCjqEpBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-18T20:41:41.425954Z"},"content_sha256":"6093881ce4cb1d9b975155b3be78293a8af48526c8616e0b1c6f1cba092c5872","schema_version":"1.0","event_id":"sha256:6093881ce4cb1d9b975155b3be78293a8af48526c8616e0b1c6f1cba092c5872"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1998:KXMEZO73DFXEKTREIOWE456F2H","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Photoproduction of Heavy Vector Mesons at HERA -- A Testfield for Diffraction","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"F. Paccanoni, L.L. Jenkovszky, R. Fiore","submitted_at":"1998-12-21T15:12:24Z","abstract_excerpt":"Exclusive diffractive photoproduction of heavy vector mesons (V=phi, J/psi and Upsilon) at HERA is studied in a model employing a dipole Pomeron exchange (P) with an inelastic gamma-P-V vertex. The model is fitted to the data on dsigma/dt, B and elastic sigma for Q^2=0 and beyond the threshold region. The elastic cross sections for both phi and J/psi photoproduction show a moderate increase within the HERA energy region. The flattening of the slope B(s) (little or no shrinkage) for J/psi is not correlated with the slope of the Pomeron trajectory. Estimates for Upsilon photoproduction at HERA a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9812458","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":"2026-05-18T04:13:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"loGE+TwvuTm2vNWxZRlLWbSZNRpzQZogLin/PJztWp7iZy8mfM6zNbRe8IDZd88FxRAWsXnqMMYl5ZGHkKalAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-18T20:41:41.426486Z"},"content_sha256":"2a404098d7cb7ef7cf08910d0d5508971a782c66bbd9735db8a68808f8b413df","schema_version":"1.0","event_id":"sha256:2a404098d7cb7ef7cf08910d0d5508971a782c66bbd9735db8a68808f8b413df"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KXMEZO73DFXEKTREIOWE456F2H/bundle.json","state_url":"https://pith.science/pith/KXMEZO73DFXEKTREIOWE456F2H/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KXMEZO73DFXEKTREIOWE456F2H/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":"2026-05-18T20:41:41Z","links":{"resolver":"https://pith.science/pith/KXMEZO73DFXEKTREIOWE456F2H","bundle":"https://pith.science/pith/KXMEZO73DFXEKTREIOWE456F2H/bundle.json","state":"https://pith.science/pith/KXMEZO73DFXEKTREIOWE456F2H/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KXMEZO73DFXEKTREIOWE456F2H/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1998:KXMEZO73DFXEKTREIOWE456F2H","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":"817736f7a7dc7e53cee8e947f88f038a9b543114ddfc5cd0ddfcea9b6e2cad48","cross_cats_sorted":[],"license":"","primary_cat":"hep-ph","submitted_at":"1998-12-21T15:12:24Z","title_canon_sha256":"6e3139f3bfa441203f2b810cbee3c354824270a91523b55ebaf23eef1ca87954"},"schema_version":"1.0","source":{"id":"hep-ph/9812458","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-ph/9812458","created_at":"2026-05-18T04:13:17Z"},{"alias_kind":"arxiv_version","alias_value":"hep-ph/9812458v1","created_at":"2026-05-18T04:13:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-ph/9812458","created_at":"2026-05-18T04:13:17Z"},{"alias_kind":"pith_short_12","alias_value":"KXMEZO73DFXE","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"KXMEZO73DFXEKTRE","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"KXMEZO73","created_at":"2026-05-18T12:25:49Z"}],"graph_snapshots":[{"event_id":"sha256:2a404098d7cb7ef7cf08910d0d5508971a782c66bbd9735db8a68808f8b413df","target":"graph","created_at":"2026-05-18T04:13:17Z","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":"Exclusive diffractive photoproduction of heavy vector mesons (V=phi, J/psi and Upsilon) at HERA is studied in a model employing a dipole Pomeron exchange (P) with an inelastic gamma-P-V vertex. The model is fitted to the data on dsigma/dt, B and elastic sigma for Q^2=0 and beyond the threshold region. The elastic cross sections for both phi and J/psi photoproduction show a moderate increase within the HERA energy region. The flattening of the slope B(s) (little or no shrinkage) for J/psi is not correlated with the slope of the Pomeron trajectory. Estimates for Upsilon photoproduction at HERA a","authors_text":"F. Paccanoni, L.L. Jenkovszky, R. Fiore","cross_cats":[],"headline":"","license":"","primary_cat":"hep-ph","submitted_at":"1998-12-21T15:12:24Z","title":"Photoproduction of Heavy Vector Mesons at HERA -- A Testfield for Diffraction"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9812458","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":"sha256:6093881ce4cb1d9b975155b3be78293a8af48526c8616e0b1c6f1cba092c5872","target":"record","created_at":"2026-05-18T04:13:17Z","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":"817736f7a7dc7e53cee8e947f88f038a9b543114ddfc5cd0ddfcea9b6e2cad48","cross_cats_sorted":[],"license":"","primary_cat":"hep-ph","submitted_at":"1998-12-21T15:12:24Z","title_canon_sha256":"6e3139f3bfa441203f2b810cbee3c354824270a91523b55ebaf23eef1ca87954"},"schema_version":"1.0","source":{"id":"hep-ph/9812458","kind":"arxiv","version":1}},"canonical_sha256":"55d84cbbfb196e454e2443ac4e77c5d1fabcc40a1b9f0d1bf4767c42bc2b7276","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"55d84cbbfb196e454e2443ac4e77c5d1fabcc40a1b9f0d1bf4767c42bc2b7276","first_computed_at":"2026-05-18T04:13:17.781305Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:13:17.781305Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Ck+je/BBnlcdAnkSPvO15H5mNxC0n3eiaPp60yPQnxtO+kb6P4eZL34RNiPR25ieEkP9CHyvTRvcApZjOIDgCw==","signature_status":"signed_v1","signed_at":"2026-05-18T04:13:17.781810Z","signed_message":"canonical_sha256_bytes"},"source_id":"hep-ph/9812458","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6093881ce4cb1d9b975155b3be78293a8af48526c8616e0b1c6f1cba092c5872","sha256:2a404098d7cb7ef7cf08910d0d5508971a782c66bbd9735db8a68808f8b413df"],"state_sha256":"b6b1b0ef2f971d2a0d7868f65be2fc88176a4a9771a457c98336ce38e1372d0c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gyxFDxPUojGVhNMfWDMlKMR4MqZg5dH16uf8gzpJlp5j4+T2rxbrLhIOt8i87ODstrzHFai+37uV7OjN26N6DQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-18T20:41:41.428001Z","bundle_sha256":"44b9a028870ac67bc3c1953f1af401cdf98685624d70f1f5d7a06219e4f60523"}}