{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1997:TQLGT4BOELB4VPHF6IEYVLLG5B","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":"7617adaa2330ab222defd90596004a2656a78fe6b52f3de6d98c328af6893dbd","cross_cats_sorted":[],"license":"","primary_cat":"nucl-th","submitted_at":"1997-12-21T14:03:43Z","title_canon_sha256":"49273a5060ed025c0612406aa0ebad880e13757fe926165f48ad72f7a9930878"},"schema_version":"1.0","source":{"id":"nucl-th/9712069","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"nucl-th/9712069","created_at":"2026-05-18T01:09:14Z"},{"alias_kind":"arxiv_version","alias_value":"nucl-th/9712069v2","created_at":"2026-05-18T01:09:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.nucl-th/9712069","created_at":"2026-05-18T01:09:14Z"},{"alias_kind":"pith_short_12","alias_value":"TQLGT4BOELB4","created_at":"2026-05-18T12:25:48Z"},{"alias_kind":"pith_short_16","alias_value":"TQLGT4BOELB4VPHF","created_at":"2026-05-18T12:25:48Z"},{"alias_kind":"pith_short_8","alias_value":"TQLGT4BO","created_at":"2026-05-18T12:25:48Z"}],"graph_snapshots":[{"event_id":"sha256:324eb26b8551fbf301c1e77428f5ed628897d3a8de9b95e11c0862d0f39b1e3a","target":"graph","created_at":"2026-05-18T01:09:14Z","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":"Dielectron mass spectra are examined for various nuclear reactions recently measured by the DLS collaboration. A detailed description is given of all dilepton channels included in the transport model UrQMD 1.0, i.e. Dalitz decays of $\\pi^0,\\eta,\\omega,\\eta'$ mesons and of the $\\Delta(1232)$ resonance, direct decays of vector mesons and $pn$ bremsstrahlung. The microscopic calculations reproduce data for light systems fairly well, but tend to underestimate the data in $pp$ at high energies and in $pd$ at low energies. These conventional sources, however, cannot explain the recently reported enh","authors_text":"C. Ernst, H. St\\\"ocker, M. Belkacem, S. A. Bass, W. Greiner","cross_cats":[],"headline":"","license":"","primary_cat":"nucl-th","submitted_at":"1997-12-21T14:03:43Z","title":"Intermediate mass excess of dilepton production in heavy ion collisions at BEVALAC energies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"nucl-th/9712069","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:bf6fb9c4cc90677ff17c0d7fd466b10c4c38cf84cb3156bd940b8a18a9f0ad8d","target":"record","created_at":"2026-05-18T01:09:14Z","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":"7617adaa2330ab222defd90596004a2656a78fe6b52f3de6d98c328af6893dbd","cross_cats_sorted":[],"license":"","primary_cat":"nucl-th","submitted_at":"1997-12-21T14:03:43Z","title_canon_sha256":"49273a5060ed025c0612406aa0ebad880e13757fe926165f48ad72f7a9930878"},"schema_version":"1.0","source":{"id":"nucl-th/9712069","kind":"arxiv","version":2}},"canonical_sha256":"9c1669f02e22c3cabce5f2098aad66e84f85cabfd17c6f95fdb27bd399b660bc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9c1669f02e22c3cabce5f2098aad66e84f85cabfd17c6f95fdb27bd399b660bc","first_computed_at":"2026-05-18T01:09:14.878997Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:09:14.878997Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"yDsHR84qFFcLKa1UTuJgrOfYe4w2vOG0E2UFmUpY8VLpFL7MPMbYz7HGQIBtRQnCh+MRjqf4scaxqHtPQKOVDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:09:14.879611Z","signed_message":"canonical_sha256_bytes"},"source_id":"nucl-th/9712069","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bf6fb9c4cc90677ff17c0d7fd466b10c4c38cf84cb3156bd940b8a18a9f0ad8d","sha256:324eb26b8551fbf301c1e77428f5ed628897d3a8de9b95e11c0862d0f39b1e3a"],"state_sha256":"9d14661f174eb0b13c4c48a5711d1c8b35b4b6a52829268ee39bf66d6286e0f8"}