{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:METC655JXJXHS7FMLSB66I5J42","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":"465f9335bee17d9225a97fb5f6f21fcb6314f122c0893c339c3db126ff3a03e9","cross_cats_sorted":["physics.hist-ph","physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2018-11-16T18:57:45Z","title_canon_sha256":"58bf020269a39611278b42b5e00f44589cfbb05cb5eb4c9c1d060604a0f981ad"},"schema_version":"1.0","source":{"id":"1811.06974","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.06974","created_at":"2026-05-18T00:00:33Z"},{"alias_kind":"arxiv_version","alias_value":"1811.06974v1","created_at":"2026-05-18T00:00:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.06974","created_at":"2026-05-18T00:00:33Z"},{"alias_kind":"pith_short_12","alias_value":"METC655JXJXH","created_at":"2026-05-18T12:32:37Z"},{"alias_kind":"pith_short_16","alias_value":"METC655JXJXHS7FM","created_at":"2026-05-18T12:32:37Z"},{"alias_kind":"pith_short_8","alias_value":"METC655J","created_at":"2026-05-18T12:32:37Z"}],"graph_snapshots":[{"event_id":"sha256:d308021fb38106e3cb24e68b586e878a4d5d3ebc6df6cf6c6f1ef4dcb18dc8dd","target":"graph","created_at":"2026-05-18T00:00:33Z","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":"I discuss the history of the muon $(g-2)$ measurements, beginning with the Columbia-Nevis measurement that observed parity violation in muon decay, and also measured the muon $g$-factor for the first time, finding $g_\\mu=2$. The theoretical (Standard Model) value contains contributions from quantum electrodynamics, the strong interaction through hadronic vacuum polarization and hadronic light-by-light loops, as well as the electroweak contributions from the $W$, $Z$ and Higgs bosons. The subsequent experiments, first at Nevis and then with increasing precision at CERN, measured the muon anomal","authors_text":"B. Lee Roberts","cross_cats":["physics.hist-ph","physics.ins-det"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2018-11-16T18:57:45Z","title":"The History of the Muon (g-2) Experiments"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.06974","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":"sha256:6d9430a7df31d8282729da691f5c7ddec05ba4684749e8d9cba8b2e456715dbf","target":"record","created_at":"2026-05-18T00:00:33Z","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":"465f9335bee17d9225a97fb5f6f21fcb6314f122c0893c339c3db126ff3a03e9","cross_cats_sorted":["physics.hist-ph","physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2018-11-16T18:57:45Z","title_canon_sha256":"58bf020269a39611278b42b5e00f44589cfbb05cb5eb4c9c1d060604a0f981ad"},"schema_version":"1.0","source":{"id":"1811.06974","kind":"arxiv","version":1}},"canonical_sha256":"61262f77a9ba6e797cac5c83ef23a9e69fcd2ad047a91dd41f3e123ff444e1c3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"61262f77a9ba6e797cac5c83ef23a9e69fcd2ad047a91dd41f3e123ff444e1c3","first_computed_at":"2026-05-18T00:00:33.332402Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:00:33.332402Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6/ZzYUcMJ5+W+/MV8PkSAs+dMstvM+Qup5gYsPDo4HhT2zpt7109FVqGI7Wgw8V5aFO6ksr5MD97BMbYBVWtCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:00:33.332888Z","signed_message":"canonical_sha256_bytes"},"source_id":"1811.06974","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6d9430a7df31d8282729da691f5c7ddec05ba4684749e8d9cba8b2e456715dbf","sha256:d308021fb38106e3cb24e68b586e878a4d5d3ebc6df6cf6c6f1ef4dcb18dc8dd"],"state_sha256":"9f534f28a517a21534a5990c94a463e249106f2477342ea945a0a40f9c4f5149"}