{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:D3FSXT3IGAV7D2VAMEDIYPXHYK","short_pith_number":"pith:D3FSXT3I","canonical_record":{"source":{"id":"1301.2581","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2013-01-11T19:44:35Z","cross_cats_sorted":["hep-ph"],"title_canon_sha256":"efc7049f1e953cda48847aa3394fb52ce9193309f0f0c7493fa046fb6f315e68","abstract_canon_sha256":"6f9ad674b10c050eaee0ea17e0c2a6bb2033a732c2c17c8bb0cf82e19cf660fa"},"schema_version":"1.0"},"canonical_sha256":"1ecb2bcf68302bf1eaa061068c3ee7c2854d14f9b5004a2c95c4f98be456ec8c","source":{"kind":"arxiv","id":"1301.2581","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1301.2581","created_at":"2026-05-18T01:52:13Z"},{"alias_kind":"arxiv_version","alias_value":"1301.2581v1","created_at":"2026-05-18T01:52:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1301.2581","created_at":"2026-05-18T01:52:13Z"},{"alias_kind":"pith_short_12","alias_value":"D3FSXT3IGAV7","created_at":"2026-05-18T12:27:40Z"},{"alias_kind":"pith_short_16","alias_value":"D3FSXT3IGAV7D2VA","created_at":"2026-05-18T12:27:40Z"},{"alias_kind":"pith_short_8","alias_value":"D3FSXT3I","created_at":"2026-05-18T12:27:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:D3FSXT3IGAV7D2VAMEDIYPXHYK","target":"record","payload":{"canonical_record":{"source":{"id":"1301.2581","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2013-01-11T19:44:35Z","cross_cats_sorted":["hep-ph"],"title_canon_sha256":"efc7049f1e953cda48847aa3394fb52ce9193309f0f0c7493fa046fb6f315e68","abstract_canon_sha256":"6f9ad674b10c050eaee0ea17e0c2a6bb2033a732c2c17c8bb0cf82e19cf660fa"},"schema_version":"1.0"},"canonical_sha256":"1ecb2bcf68302bf1eaa061068c3ee7c2854d14f9b5004a2c95c4f98be456ec8c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:52:13.243171Z","signature_b64":"YGEOdPlcKT3smYmzYfXw8F77FsY1bntiDP3jgvbvnjqCAoQBcntX5wTRF8Tm+FKRUkHkmrZWMCuvkSbEixbfDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1ecb2bcf68302bf1eaa061068c3ee7c2854d14f9b5004a2c95c4f98be456ec8c","last_reissued_at":"2026-05-18T01:52:13.242585Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:52:13.242585Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1301.2581","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":"2026-05-18T01:52:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cxy0HPtzeyPg97Zk1yYGxIoWg/x4B+n4B/trFKKnoORmRaryGOisvqCY9sr+UqGGs3ocka0ry4kN22qvGGN8Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-18T21:34:36.442019Z"},"content_sha256":"a7273f3f1b2d46e6fdc7d1d8b651dbcc6e7a4c44a1bb3d8d48bd5cf35522b6d5","schema_version":"1.0","event_id":"sha256:a7273f3f1b2d46e6fdc7d1d8b651dbcc6e7a4c44a1bb3d8d48bd5cf35522b6d5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:D3FSXT3IGAV7D2VAMEDIYPXHYK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"APEX: A Prime EXperiment at Jefferson Lab","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ph"],"primary_cat":"hep-ex","authors_text":"James Beacham","submitted_at":"2013-01-11T19:44:35Z","abstract_excerpt":"APEX is an experiment at Thomas Jefferson National Accelerator Facility (JLab) in Virginia, USA, that searches for a new gauge boson ($A^\\prime$) with sub-GeV mass and coupling to ordinary matter of $g^\\prime \\sim (10^{-6} - 10^{-2}) e$. Electrons impinge upon a fixed target of high-Z material. An $A^\\prime$ is produced via a process analogous to photon bremsstrahlung, decaying to an $e^+ e^-$ pair. A test run was held in July of 2010, covering $m_{A^\\prime}$ = 175 to 250 MeV and couplings $g^\\prime/e \\; \\textgreater \\; 10^{-3}$. A full run is approved and will cover $m_{A^\\prime} \\sim$ 65 to "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1301.2581","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":"2026-05-18T01:52:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vjrYb0q9snBn082jVs29ml7pDRzUJ12/CIIEzX93MtIx03W/7B85V6NlYp98gOQp6JNpUjs7Z0NvSecYpnmNAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-18T21:34:36.442598Z"},"content_sha256":"bc8f68952da0f4bd1e4c7072bf6d45a5ed7154735e2d3cb5a186cec0604c6eb3","schema_version":"1.0","event_id":"sha256:bc8f68952da0f4bd1e4c7072bf6d45a5ed7154735e2d3cb5a186cec0604c6eb3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/D3FSXT3IGAV7D2VAMEDIYPXHYK/bundle.json","state_url":"https://pith.science/pith/D3FSXT3IGAV7D2VAMEDIYPXHYK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/D3FSXT3IGAV7D2VAMEDIYPXHYK/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":"2026-05-18T21:34:36Z","links":{"resolver":"https://pith.science/pith/D3FSXT3IGAV7D2VAMEDIYPXHYK","bundle":"https://pith.science/pith/D3FSXT3IGAV7D2VAMEDIYPXHYK/bundle.json","state":"https://pith.science/pith/D3FSXT3IGAV7D2VAMEDIYPXHYK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/D3FSXT3IGAV7D2VAMEDIYPXHYK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:D3FSXT3IGAV7D2VAMEDIYPXHYK","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":"6f9ad674b10c050eaee0ea17e0c2a6bb2033a732c2c17c8bb0cf82e19cf660fa","cross_cats_sorted":["hep-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2013-01-11T19:44:35Z","title_canon_sha256":"efc7049f1e953cda48847aa3394fb52ce9193309f0f0c7493fa046fb6f315e68"},"schema_version":"1.0","source":{"id":"1301.2581","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1301.2581","created_at":"2026-05-18T01:52:13Z"},{"alias_kind":"arxiv_version","alias_value":"1301.2581v1","created_at":"2026-05-18T01:52:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1301.2581","created_at":"2026-05-18T01:52:13Z"},{"alias_kind":"pith_short_12","alias_value":"D3FSXT3IGAV7","created_at":"2026-05-18T12:27:40Z"},{"alias_kind":"pith_short_16","alias_value":"D3FSXT3IGAV7D2VA","created_at":"2026-05-18T12:27:40Z"},{"alias_kind":"pith_short_8","alias_value":"D3FSXT3I","created_at":"2026-05-18T12:27:40Z"}],"graph_snapshots":[{"event_id":"sha256:bc8f68952da0f4bd1e4c7072bf6d45a5ed7154735e2d3cb5a186cec0604c6eb3","target":"graph","created_at":"2026-05-18T01:52:13Z","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":"APEX is an experiment at Thomas Jefferson National Accelerator Facility (JLab) in Virginia, USA, that searches for a new gauge boson ($A^\\prime$) with sub-GeV mass and coupling to ordinary matter of $g^\\prime \\sim (10^{-6} - 10^{-2}) e$. Electrons impinge upon a fixed target of high-Z material. An $A^\\prime$ is produced via a process analogous to photon bremsstrahlung, decaying to an $e^+ e^-$ pair. A test run was held in July of 2010, covering $m_{A^\\prime}$ = 175 to 250 MeV and couplings $g^\\prime/e \\; \\textgreater \\; 10^{-3}$. A full run is approved and will cover $m_{A^\\prime} \\sim$ 65 to ","authors_text":"James Beacham","cross_cats":["hep-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2013-01-11T19:44:35Z","title":"APEX: A Prime EXperiment at Jefferson Lab"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1301.2581","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:a7273f3f1b2d46e6fdc7d1d8b651dbcc6e7a4c44a1bb3d8d48bd5cf35522b6d5","target":"record","created_at":"2026-05-18T01:52:13Z","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":"6f9ad674b10c050eaee0ea17e0c2a6bb2033a732c2c17c8bb0cf82e19cf660fa","cross_cats_sorted":["hep-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2013-01-11T19:44:35Z","title_canon_sha256":"efc7049f1e953cda48847aa3394fb52ce9193309f0f0c7493fa046fb6f315e68"},"schema_version":"1.0","source":{"id":"1301.2581","kind":"arxiv","version":1}},"canonical_sha256":"1ecb2bcf68302bf1eaa061068c3ee7c2854d14f9b5004a2c95c4f98be456ec8c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1ecb2bcf68302bf1eaa061068c3ee7c2854d14f9b5004a2c95c4f98be456ec8c","first_computed_at":"2026-05-18T01:52:13.242585Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:52:13.242585Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"YGEOdPlcKT3smYmzYfXw8F77FsY1bntiDP3jgvbvnjqCAoQBcntX5wTRF8Tm+FKRUkHkmrZWMCuvkSbEixbfDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:52:13.243171Z","signed_message":"canonical_sha256_bytes"},"source_id":"1301.2581","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a7273f3f1b2d46e6fdc7d1d8b651dbcc6e7a4c44a1bb3d8d48bd5cf35522b6d5","sha256:bc8f68952da0f4bd1e4c7072bf6d45a5ed7154735e2d3cb5a186cec0604c6eb3"],"state_sha256":"9163700ce6617151b43a1aa0b7c86fa4855f7ebc6dec5896775855a797b9848b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uhCX/DS72n5qo+Fpgd4i5IuLTGDQm+WeEwbt4yiTWrwkbbo2jLhD55vZuJfOHgOSzTN1OIEGD6OUpHcqslnIBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-18T21:34:36.444381Z","bundle_sha256":"3845181a30207e66c7e298b37e4fd363ae308f3c740afad1f7310f4380e4bcb3"}}