{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:VXFLJMKAUNRG5IQ5DQ6OMMPT34","short_pith_number":"pith:VXFLJMKA","canonical_record":{"source":{"id":"1908.07921","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2019-08-20T11:19:28Z","cross_cats_sorted":["nucl-ex","physics.ins-det"],"title_canon_sha256":"bf0368fb0023e91bc71f6814034b32e0e5fc365f72b727ad491d215c290c985b","abstract_canon_sha256":"3e69833782806a93493d060b928947112f5d88aaa91ed36e7178819babd9d434"},"schema_version":"1.0"},"canonical_sha256":"adcab4b140a3626ea21d1c3ce631f3df175f106ef89b4686722c9da89bb1a0c7","source":{"kind":"arxiv","id":"1908.07921","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.07921","created_at":"2026-07-04T23:59:02Z"},{"alias_kind":"arxiv_version","alias_value":"1908.07921v1","created_at":"2026-07-04T23:59:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.07921","created_at":"2026-07-04T23:59:02Z"},{"alias_kind":"pith_short_12","alias_value":"VXFLJMKAUNRG","created_at":"2026-07-04T23:59:02Z"},{"alias_kind":"pith_short_16","alias_value":"VXFLJMKAUNRG5IQ5","created_at":"2026-07-04T23:59:02Z"},{"alias_kind":"pith_short_8","alias_value":"VXFLJMKA","created_at":"2026-07-04T23:59:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:VXFLJMKAUNRG5IQ5DQ6OMMPT34","target":"record","payload":{"canonical_record":{"source":{"id":"1908.07921","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2019-08-20T11:19:28Z","cross_cats_sorted":["nucl-ex","physics.ins-det"],"title_canon_sha256":"bf0368fb0023e91bc71f6814034b32e0e5fc365f72b727ad491d215c290c985b","abstract_canon_sha256":"3e69833782806a93493d060b928947112f5d88aaa91ed36e7178819babd9d434"},"schema_version":"1.0"},"canonical_sha256":"adcab4b140a3626ea21d1c3ce631f3df175f106ef89b4686722c9da89bb1a0c7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:59:02.478470Z","signature_b64":"HvaMeGSCGveT1zOkmBdkkh1Qw8RxRHWR5WzEeP58GBYT3DGhYsAVA5DEEuc5zfksKp+tAX4IY0miklHsiPfSDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"adcab4b140a3626ea21d1c3ce631f3df175f106ef89b4686722c9da89bb1a0c7","last_reissued_at":"2026-07-04T23:59:02.478078Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:59:02.478078Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.07921","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":"2026-07-04T23:59:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sl5iBwFrE0ZAdY1I/tEyLXf8xA5XXDHiCb+rhCPUdRCGXDHvvyQ2qH9h2LkHTQzOKzfhIaeV3s5qLKX8QP5jBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T18:58:42.817708Z"},"content_sha256":"082af907b128c26834836895038ed1fdb630781061dabeb1e3c4e40e6e7578df","schema_version":"1.0","event_id":"sha256:082af907b128c26834836895038ed1fdb630781061dabeb1e3c4e40e6e7578df"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:VXFLJMKAUNRG5IQ5DQ6OMMPT34","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Dark Matter at the Intensity Frontier: the new MESA electron accelerator facility","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-ex","physics.ins-det"],"primary_cat":"hep-ex","authors_text":"Achim Denig, Harald Merkel, Luca Doria, Mirco Christmann, Patrick Achenbach","submitted_at":"2019-08-20T11:19:28Z","abstract_excerpt":"Dark Matter is being searched with a variety of methods, each of which tackles this challenge focusing on different kinds of particles, masses and couplings. Here we describe Dark Matter searches conducted with accelerators and fixed targets. In particular, we highlight the contribution of the experiments being built at the new Mainz Energy-recovery Superconducting Accelerator (MESA) facility. MESA will provide intense electron beams for hadron and nuclear physics, as well as for Dark Matter searches with competitive sensitivities."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.07921","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1908.07921/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T23:59:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lZj7SRuJ7/oNHGWDz2q/sPMwtTTSh7JvBsqnOkbH/QFVI22VJpX7ZDQHMBgXaZzwFNRfHhiAWmTTD+57PzjoDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T18:58:42.818211Z"},"content_sha256":"871d0dd97f1455b84e812273fb68e65be0983f84f9936ef28670d957dc09051a","schema_version":"1.0","event_id":"sha256:871d0dd97f1455b84e812273fb68e65be0983f84f9936ef28670d957dc09051a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VXFLJMKAUNRG5IQ5DQ6OMMPT34/bundle.json","state_url":"https://pith.science/pith/VXFLJMKAUNRG5IQ5DQ6OMMPT34/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VXFLJMKAUNRG5IQ5DQ6OMMPT34/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":"2026-08-11T18:58:42Z","links":{"resolver":"https://pith.science/pith/VXFLJMKAUNRG5IQ5DQ6OMMPT34","bundle":"https://pith.science/pith/VXFLJMKAUNRG5IQ5DQ6OMMPT34/bundle.json","state":"https://pith.science/pith/VXFLJMKAUNRG5IQ5DQ6OMMPT34/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VXFLJMKAUNRG5IQ5DQ6OMMPT34/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:VXFLJMKAUNRG5IQ5DQ6OMMPT34","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":"3e69833782806a93493d060b928947112f5d88aaa91ed36e7178819babd9d434","cross_cats_sorted":["nucl-ex","physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2019-08-20T11:19:28Z","title_canon_sha256":"bf0368fb0023e91bc71f6814034b32e0e5fc365f72b727ad491d215c290c985b"},"schema_version":"1.0","source":{"id":"1908.07921","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.07921","created_at":"2026-07-04T23:59:02Z"},{"alias_kind":"arxiv_version","alias_value":"1908.07921v1","created_at":"2026-07-04T23:59:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.07921","created_at":"2026-07-04T23:59:02Z"},{"alias_kind":"pith_short_12","alias_value":"VXFLJMKAUNRG","created_at":"2026-07-04T23:59:02Z"},{"alias_kind":"pith_short_16","alias_value":"VXFLJMKAUNRG5IQ5","created_at":"2026-07-04T23:59:02Z"},{"alias_kind":"pith_short_8","alias_value":"VXFLJMKA","created_at":"2026-07-04T23:59:02Z"}],"graph_snapshots":[{"event_id":"sha256:871d0dd97f1455b84e812273fb68e65be0983f84f9936ef28670d957dc09051a","target":"graph","created_at":"2026-07-04T23:59:02Z","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/1908.07921/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Dark Matter is being searched with a variety of methods, each of which tackles this challenge focusing on different kinds of particles, masses and couplings. Here we describe Dark Matter searches conducted with accelerators and fixed targets. In particular, we highlight the contribution of the experiments being built at the new Mainz Energy-recovery Superconducting Accelerator (MESA) facility. MESA will provide intense electron beams for hadron and nuclear physics, as well as for Dark Matter searches with competitive sensitivities.","authors_text":"Achim Denig, Harald Merkel, Luca Doria, Mirco Christmann, Patrick Achenbach","cross_cats":["nucl-ex","physics.ins-det"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2019-08-20T11:19:28Z","title":"Dark Matter at the Intensity Frontier: the new MESA electron accelerator facility"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.07921","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":"sha256:082af907b128c26834836895038ed1fdb630781061dabeb1e3c4e40e6e7578df","target":"record","created_at":"2026-07-04T23:59:02Z","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":"3e69833782806a93493d060b928947112f5d88aaa91ed36e7178819babd9d434","cross_cats_sorted":["nucl-ex","physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2019-08-20T11:19:28Z","title_canon_sha256":"bf0368fb0023e91bc71f6814034b32e0e5fc365f72b727ad491d215c290c985b"},"schema_version":"1.0","source":{"id":"1908.07921","kind":"arxiv","version":1}},"canonical_sha256":"adcab4b140a3626ea21d1c3ce631f3df175f106ef89b4686722c9da89bb1a0c7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"adcab4b140a3626ea21d1c3ce631f3df175f106ef89b4686722c9da89bb1a0c7","first_computed_at":"2026-07-04T23:59:02.478078Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:59:02.478078Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HvaMeGSCGveT1zOkmBdkkh1Qw8RxRHWR5WzEeP58GBYT3DGhYsAVA5DEEuc5zfksKp+tAX4IY0miklHsiPfSDQ==","signature_status":"signed_v1","signed_at":"2026-07-04T23:59:02.478470Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.07921","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:082af907b128c26834836895038ed1fdb630781061dabeb1e3c4e40e6e7578df","sha256:871d0dd97f1455b84e812273fb68e65be0983f84f9936ef28670d957dc09051a"],"state_sha256":"37b4947e9c7bd66fc3de356c861ccdddf193f49bcbf3d6e56c3fd3826e412e84"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ShAEjCtX79jlm81rTeQAvz2C7sMfQWsvPJikAkpUIoW3FYD7xuLLeMyzDhotU/wq+7KKu+NRCt4BvoisM0Q9Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-11T18:58:42.822117Z","bundle_sha256":"c1e543b4e186164dd60eb38bdde5a4fdf53f49b8cf809b2877b5aad4f034c335"}}