{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1997:WGJTKRS34WIQUSO5RHQNSY6IEX","short_pith_number":"pith:WGJTKRS3","canonical_record":{"source":{"id":"hep-ph/9701252","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-ph","submitted_at":"1997-01-09T10:01:24Z","cross_cats_sorted":[],"title_canon_sha256":"467cea2055aaeb89a111fac82305ee1db65dda9d063b0df1fdf6710d6019f22b","abstract_canon_sha256":"e3796fbeb0d006d11a81bc290ae48e1f8d6cb466e9cba15d14d03e53007ebe55"},"schema_version":"1.0"},"canonical_sha256":"b19335465be5910a49dd89e0d963c825dcc7dbb3a4e831a2182a29ca0292d320","source":{"kind":"arxiv","id":"hep-ph/9701252","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-ph/9701252","created_at":"2026-05-18T01:38:56Z"},{"alias_kind":"arxiv_version","alias_value":"hep-ph/9701252v1","created_at":"2026-05-18T01:38:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-ph/9701252","created_at":"2026-05-18T01:38:56Z"},{"alias_kind":"pith_short_12","alias_value":"WGJTKRS34WIQ","created_at":"2026-05-18T12:25:48Z"},{"alias_kind":"pith_short_16","alias_value":"WGJTKRS34WIQUSO5","created_at":"2026-05-18T12:25:48Z"},{"alias_kind":"pith_short_8","alias_value":"WGJTKRS3","created_at":"2026-05-18T12:25:48Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1997:WGJTKRS34WIQUSO5RHQNSY6IEX","target":"record","payload":{"canonical_record":{"source":{"id":"hep-ph/9701252","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-ph","submitted_at":"1997-01-09T10:01:24Z","cross_cats_sorted":[],"title_canon_sha256":"467cea2055aaeb89a111fac82305ee1db65dda9d063b0df1fdf6710d6019f22b","abstract_canon_sha256":"e3796fbeb0d006d11a81bc290ae48e1f8d6cb466e9cba15d14d03e53007ebe55"},"schema_version":"1.0"},"canonical_sha256":"b19335465be5910a49dd89e0d963c825dcc7dbb3a4e831a2182a29ca0292d320","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:38:56.933527Z","signature_b64":"cJrflFV6wKndJfr4LXDEj4XURr0DGKtJuepsgiWn++7YDGxvzT1kLpdhcgEEr/cbkXcoRNUhlG96ajT2sitfCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b19335465be5910a49dd89e0d963c825dcc7dbb3a4e831a2182a29ca0292d320","last_reissued_at":"2026-05-18T01:38:56.932887Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:38:56.932887Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"hep-ph/9701252","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":"2026-05-18T01:38:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gl8QMn6II3wySEpT/CL7pXJJlkDmPxth4CVD1OeBipNuWDaOp8sh/dzsWJFL4tsjKZYd06w7xZz5ARj/QW0KAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T04:07:58.283030Z"},"content_sha256":"ea2f54dbda09aeeb6c808a94fbb6098c1e74b49dc7d17b8cc45e79eb21912c0c","schema_version":"1.0","event_id":"sha256:ea2f54dbda09aeeb6c808a94fbb6098c1e74b49dc7d17b8cc45e79eb21912c0c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1997:WGJTKRS34WIQUSO5RHQNSY6IEX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Open charm production in diffractive ep collisions","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Ecole polytechnique, M. Diehl (CPT, Palaiseau)","submitted_at":"1997-01-09T10:01:24Z","abstract_excerpt":"The cross section for the diffractive reaction gamma* + p -> c cbar + p with a real or virtual photon is calculated in the nonperturbative two-gluon exchange model of Landshoff and Nachtmann. Numerical predictions are given for cross sections and spectra at typical HERA values of c.m. energy and photon virtuality. The contribution of charm to the diffractive structure function is evaluated and found to be rather small in the model, and the ratio between the production rates for b bbar and c cbar is tiny."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9701252","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":"2026-05-18T01:38:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NZPweeWp/qSK6jCxgKkNvBEm0wWQG4nFaVMzFy4i8s2mlzvmKtbaaJWloa66lZsyceo176XM/DRhmTQvTJuoAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T04:07:58.283388Z"},"content_sha256":"67b0e091ceacd42cdd00c3fcd493775dd920a12906b6e3661a92ebbbeb9de9de","schema_version":"1.0","event_id":"sha256:67b0e091ceacd42cdd00c3fcd493775dd920a12906b6e3661a92ebbbeb9de9de"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WGJTKRS34WIQUSO5RHQNSY6IEX/bundle.json","state_url":"https://pith.science/pith/WGJTKRS34WIQUSO5RHQNSY6IEX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WGJTKRS34WIQUSO5RHQNSY6IEX/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":"2026-06-04T04:07:58Z","links":{"resolver":"https://pith.science/pith/WGJTKRS34WIQUSO5RHQNSY6IEX","bundle":"https://pith.science/pith/WGJTKRS34WIQUSO5RHQNSY6IEX/bundle.json","state":"https://pith.science/pith/WGJTKRS34WIQUSO5RHQNSY6IEX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WGJTKRS34WIQUSO5RHQNSY6IEX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1997:WGJTKRS34WIQUSO5RHQNSY6IEX","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":"e3796fbeb0d006d11a81bc290ae48e1f8d6cb466e9cba15d14d03e53007ebe55","cross_cats_sorted":[],"license":"","primary_cat":"hep-ph","submitted_at":"1997-01-09T10:01:24Z","title_canon_sha256":"467cea2055aaeb89a111fac82305ee1db65dda9d063b0df1fdf6710d6019f22b"},"schema_version":"1.0","source":{"id":"hep-ph/9701252","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-ph/9701252","created_at":"2026-05-18T01:38:56Z"},{"alias_kind":"arxiv_version","alias_value":"hep-ph/9701252v1","created_at":"2026-05-18T01:38:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-ph/9701252","created_at":"2026-05-18T01:38:56Z"},{"alias_kind":"pith_short_12","alias_value":"WGJTKRS34WIQ","created_at":"2026-05-18T12:25:48Z"},{"alias_kind":"pith_short_16","alias_value":"WGJTKRS34WIQUSO5","created_at":"2026-05-18T12:25:48Z"},{"alias_kind":"pith_short_8","alias_value":"WGJTKRS3","created_at":"2026-05-18T12:25:48Z"}],"graph_snapshots":[{"event_id":"sha256:67b0e091ceacd42cdd00c3fcd493775dd920a12906b6e3661a92ebbbeb9de9de","target":"graph","created_at":"2026-05-18T01:38:56Z","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":"The cross section for the diffractive reaction gamma* + p -> c cbar + p with a real or virtual photon is calculated in the nonperturbative two-gluon exchange model of Landshoff and Nachtmann. Numerical predictions are given for cross sections and spectra at typical HERA values of c.m. energy and photon virtuality. The contribution of charm to the diffractive structure function is evaluated and found to be rather small in the model, and the ratio between the production rates for b bbar and c cbar is tiny.","authors_text":"Ecole polytechnique, M. Diehl (CPT, Palaiseau)","cross_cats":[],"headline":"","license":"","primary_cat":"hep-ph","submitted_at":"1997-01-09T10:01:24Z","title":"Open charm production in diffractive ep collisions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9701252","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:ea2f54dbda09aeeb6c808a94fbb6098c1e74b49dc7d17b8cc45e79eb21912c0c","target":"record","created_at":"2026-05-18T01:38:56Z","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":"e3796fbeb0d006d11a81bc290ae48e1f8d6cb466e9cba15d14d03e53007ebe55","cross_cats_sorted":[],"license":"","primary_cat":"hep-ph","submitted_at":"1997-01-09T10:01:24Z","title_canon_sha256":"467cea2055aaeb89a111fac82305ee1db65dda9d063b0df1fdf6710d6019f22b"},"schema_version":"1.0","source":{"id":"hep-ph/9701252","kind":"arxiv","version":1}},"canonical_sha256":"b19335465be5910a49dd89e0d963c825dcc7dbb3a4e831a2182a29ca0292d320","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b19335465be5910a49dd89e0d963c825dcc7dbb3a4e831a2182a29ca0292d320","first_computed_at":"2026-05-18T01:38:56.932887Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:38:56.932887Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"cJrflFV6wKndJfr4LXDEj4XURr0DGKtJuepsgiWn++7YDGxvzT1kLpdhcgEEr/cbkXcoRNUhlG96ajT2sitfCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:38:56.933527Z","signed_message":"canonical_sha256_bytes"},"source_id":"hep-ph/9701252","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ea2f54dbda09aeeb6c808a94fbb6098c1e74b49dc7d17b8cc45e79eb21912c0c","sha256:67b0e091ceacd42cdd00c3fcd493775dd920a12906b6e3661a92ebbbeb9de9de"],"state_sha256":"836c5b49f0ec4525be8363172d2602987a48a9b92a8f57042bd4fefe105dfb58"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Fm+pqhf/viULdgKqraVKtH0O8yoITcIHQkrWGeQAbflSqW2XF95FlSBuRAz6VKFhP7gkPTcB0trDmKyXvRSmAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T04:07:58.285652Z","bundle_sha256":"13a611a8dd0661073def1dedfe0360ec5fbb66e8c088b3d1a22e2311a5843937"}}