{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:XOW4JB2YCFMHFEMWIWCLZYLGC3","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":"1a8565922160ff35cd201dbd996a04c8135aec47439df60af8139e6ed3d0bf97","cross_cats_sorted":["nucl-ex","nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2022-08-31T16:23:56Z","title_canon_sha256":"cffc0461ca58561cce98b337bf4e006a47ee35d2ed19c3f41f4b477a7251f0a2"},"schema_version":"1.0","source":{"id":"2208.14943","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2208.14943","created_at":"2026-07-05T06:27:15Z"},{"alias_kind":"arxiv_version","alias_value":"2208.14943v1","created_at":"2026-07-05T06:27:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2208.14943","created_at":"2026-07-05T06:27:15Z"},{"alias_kind":"pith_short_12","alias_value":"XOW4JB2YCFMH","created_at":"2026-07-05T06:27:15Z"},{"alias_kind":"pith_short_16","alias_value":"XOW4JB2YCFMHFEMW","created_at":"2026-07-05T06:27:15Z"},{"alias_kind":"pith_short_8","alias_value":"XOW4JB2Y","created_at":"2026-07-05T06:27:15Z"}],"graph_snapshots":[{"event_id":"sha256:941e378efc5efe3851c515f1ae6ec559e356b45cc26006f5f44d235b59d3bb6f","target":"graph","created_at":"2026-07-05T06:27:15Z","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/2208.14943/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This Report reviews the effort over several decades to observe the linear Breit-Wheeler process ($\\gamma\\gamma \\rightarrow e^+e^-$) and vacuum birefringence in high-energy particle and heavy-ion collider experiment. This Report, motivated by STAR's recent observations, attempts to summarize the key issues related to the interpretation of polarized $\\gamma\\gamma \\rightarrow l^+l^-$ measurements in high-energy experiments. To that end, we start by reviewing the historical context and essential theoretical developments, before focusing on the decades of progress made in high-energy collider exper","authors_text":"James Daniel Brandenburg, Janet Seger, Wangmei Zha, Zhangbu Xu","cross_cats":["nucl-ex","nucl-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2022-08-31T16:23:56Z","title":"Report on Progress in Physics: Observation of the Breit-Wheeler Process and Vacuum Birefringence in Heavy-Ion Collisions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2208.14943","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":"sha256:6a64c88278586a4e844f1a35094564d39fb423372bbc2b609ed8d8c8f7970039","target":"record","created_at":"2026-07-05T06:27:15Z","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":"1a8565922160ff35cd201dbd996a04c8135aec47439df60af8139e6ed3d0bf97","cross_cats_sorted":["nucl-ex","nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2022-08-31T16:23:56Z","title_canon_sha256":"cffc0461ca58561cce98b337bf4e006a47ee35d2ed19c3f41f4b477a7251f0a2"},"schema_version":"1.0","source":{"id":"2208.14943","kind":"arxiv","version":1}},"canonical_sha256":"bbadc4875811587291964584bce16616cc5655ba379c7f20f9731c68a3341994","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bbadc4875811587291964584bce16616cc5655ba379c7f20f9731c68a3341994","first_computed_at":"2026-07-05T06:27:15.237032Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:27:15.237032Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MSIw6rhzbhHB9EIUUblJOi2dLX/MRv/WkxWah8QUDos/+VyseaqUDKVpkdf5f2uW1pSJRWqg6twKK+NaA8C2Dw==","signature_status":"signed_v1","signed_at":"2026-07-05T06:27:15.237511Z","signed_message":"canonical_sha256_bytes"},"source_id":"2208.14943","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6a64c88278586a4e844f1a35094564d39fb423372bbc2b609ed8d8c8f7970039","sha256:941e378efc5efe3851c515f1ae6ec559e356b45cc26006f5f44d235b59d3bb6f"],"state_sha256":"305d524ba5cf71fc5bb7d9fcedb612c42ba20d8846543dec4b90a625c2ed3c6a"}