{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2002:DZVMDYTGA6EQMO5WYNTXCFXFJH","short_pith_number":"pith:DZVMDYTG","canonical_record":{"source":{"id":"hep-ex/0202045","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-ex","submitted_at":"2002-02-28T08:39:49Z","cross_cats_sorted":[],"title_canon_sha256":"4984834d1f6d8ebf2edc245f320dac761b862d0c93ef76f87a19447a1198f838","abstract_canon_sha256":"3df9d916ce49646e93b318fe2efb087dc2e2b8e2e0b502f59722543730d8599d"},"schema_version":"1.0"},"canonical_sha256":"1e6ac1e2660789063bb6c3677116e549cd5dc88eacb0711630763be32f4c3e80","source":{"kind":"arxiv","id":"hep-ex/0202045","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-ex/0202045","created_at":"2026-07-04T16:33:49Z"},{"alias_kind":"arxiv_version","alias_value":"hep-ex/0202045v1","created_at":"2026-07-04T16:33:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-ex/0202045","created_at":"2026-07-04T16:33:49Z"},{"alias_kind":"pith_short_12","alias_value":"DZVMDYTGA6EQ","created_at":"2026-07-04T16:33:49Z"},{"alias_kind":"pith_short_16","alias_value":"DZVMDYTGA6EQMO5W","created_at":"2026-07-04T16:33:49Z"},{"alias_kind":"pith_short_8","alias_value":"DZVMDYTG","created_at":"2026-07-04T16:33:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2002:DZVMDYTGA6EQMO5WYNTXCFXFJH","target":"record","payload":{"canonical_record":{"source":{"id":"hep-ex/0202045","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-ex","submitted_at":"2002-02-28T08:39:49Z","cross_cats_sorted":[],"title_canon_sha256":"4984834d1f6d8ebf2edc245f320dac761b862d0c93ef76f87a19447a1198f838","abstract_canon_sha256":"3df9d916ce49646e93b318fe2efb087dc2e2b8e2e0b502f59722543730d8599d"},"schema_version":"1.0"},"canonical_sha256":"1e6ac1e2660789063bb6c3677116e549cd5dc88eacb0711630763be32f4c3e80","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:33:49.532730Z","signature_b64":"n3twDYWQrYJ2yEOS2C5fFV+1SHcCDepyw18Mg8h3gvDJBK9EEn/2rwDEXjAAmusR/JknyimOPlzN/lB1VpeSBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1e6ac1e2660789063bb6c3677116e549cd5dc88eacb0711630763be32f4c3e80","last_reissued_at":"2026-07-04T16:33:49.532291Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:33:49.532291Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"hep-ex/0202045","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":"2026-07-04T16:33:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"knIyBbJ/F2s71fgjZcmTi6OXhdXlUZqqkXnJ42T0ntPgOg870bw4MmoCpgkIPHRkcUptLLApSQF5O9M1v+YFBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T20:19:40.927903Z"},"content_sha256":"463116630c961e9674951d677b2ecabeb2d3ac6d18444ef2a40f0f7db8ea0f60","schema_version":"1.0","event_id":"sha256:463116630c961e9674951d677b2ecabeb2d3ac6d18444ef2a40f0f7db8ea0f60"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2002:DZVMDYTGA6EQMO5WYNTXCFXFJH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The multilevel trigger system of the DIRAC experiment","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A.Gorin, A.Kulikov, A.Sidorov, C.Schuetz, D.Goldin, F.Takeutchi, I.Manuilov, K.Kuroda, K.Okada, L.Afanasyev, L.Tauscher, M.Gallas, M.Steinacher, P.Kokkas, S.Vlachos, V.Karpukhin, V.Yazkov","submitted_at":"2002-02-28T08:39:49Z","abstract_excerpt":"The multilevel trigger system of the DIRAC experiment at CERN is presented. It includes a fast first level trigger as well as various trigger processors to select events with a pair of pions having a low relative momentum typical of the physical process under study. One of these processors employs the drift chamber data, another one is based on a neural network algorithm and the others use various hit-map detector correlations. Two versions of the trigger system used at different stages of the experiment are described. The complete system reduces the event rate by a factor of 1000, with effici"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ex/0202045","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/hep-ex/0202045/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":"2026-07-04T16:33:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"71miIqJHtEr92rfx0qWJUsk/1J3VXUthCsctwEVWsa3g2Ux9lJNLzVTE2jR68UKtVsZ3avFNIAU4Ym9HlcbUDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T20:19:40.928402Z"},"content_sha256":"8b20140da37041d10bebf039025a930777b66dd32d926baf7cb3204e9f503441","schema_version":"1.0","event_id":"sha256:8b20140da37041d10bebf039025a930777b66dd32d926baf7cb3204e9f503441"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DZVMDYTGA6EQMO5WYNTXCFXFJH/bundle.json","state_url":"https://pith.science/pith/DZVMDYTGA6EQMO5WYNTXCFXFJH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DZVMDYTGA6EQMO5WYNTXCFXFJH/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":"2026-08-03T20:19:40Z","links":{"resolver":"https://pith.science/pith/DZVMDYTGA6EQMO5WYNTXCFXFJH","bundle":"https://pith.science/pith/DZVMDYTGA6EQMO5WYNTXCFXFJH/bundle.json","state":"https://pith.science/pith/DZVMDYTGA6EQMO5WYNTXCFXFJH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DZVMDYTGA6EQMO5WYNTXCFXFJH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2002:DZVMDYTGA6EQMO5WYNTXCFXFJH","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":"3df9d916ce49646e93b318fe2efb087dc2e2b8e2e0b502f59722543730d8599d","cross_cats_sorted":[],"license":"","primary_cat":"hep-ex","submitted_at":"2002-02-28T08:39:49Z","title_canon_sha256":"4984834d1f6d8ebf2edc245f320dac761b862d0c93ef76f87a19447a1198f838"},"schema_version":"1.0","source":{"id":"hep-ex/0202045","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-ex/0202045","created_at":"2026-07-04T16:33:49Z"},{"alias_kind":"arxiv_version","alias_value":"hep-ex/0202045v1","created_at":"2026-07-04T16:33:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-ex/0202045","created_at":"2026-07-04T16:33:49Z"},{"alias_kind":"pith_short_12","alias_value":"DZVMDYTGA6EQ","created_at":"2026-07-04T16:33:49Z"},{"alias_kind":"pith_short_16","alias_value":"DZVMDYTGA6EQMO5W","created_at":"2026-07-04T16:33:49Z"},{"alias_kind":"pith_short_8","alias_value":"DZVMDYTG","created_at":"2026-07-04T16:33:49Z"}],"graph_snapshots":[{"event_id":"sha256:8b20140da37041d10bebf039025a930777b66dd32d926baf7cb3204e9f503441","target":"graph","created_at":"2026-07-04T16:33:49Z","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/hep-ex/0202045/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The multilevel trigger system of the DIRAC experiment at CERN is presented. It includes a fast first level trigger as well as various trigger processors to select events with a pair of pions having a low relative momentum typical of the physical process under study. One of these processors employs the drift chamber data, another one is based on a neural network algorithm and the others use various hit-map detector correlations. Two versions of the trigger system used at different stages of the experiment are described. The complete system reduces the event rate by a factor of 1000, with effici","authors_text":"A.Gorin, A.Kulikov, A.Sidorov, C.Schuetz, D.Goldin, F.Takeutchi, I.Manuilov, K.Kuroda, K.Okada, L.Afanasyev, L.Tauscher, M.Gallas, M.Steinacher, P.Kokkas, S.Vlachos, V.Karpukhin, V.Yazkov","cross_cats":[],"headline":"","license":"","primary_cat":"hep-ex","submitted_at":"2002-02-28T08:39:49Z","title":"The multilevel trigger system of the DIRAC experiment"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ex/0202045","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":"sha256:463116630c961e9674951d677b2ecabeb2d3ac6d18444ef2a40f0f7db8ea0f60","target":"record","created_at":"2026-07-04T16:33:49Z","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":"3df9d916ce49646e93b318fe2efb087dc2e2b8e2e0b502f59722543730d8599d","cross_cats_sorted":[],"license":"","primary_cat":"hep-ex","submitted_at":"2002-02-28T08:39:49Z","title_canon_sha256":"4984834d1f6d8ebf2edc245f320dac761b862d0c93ef76f87a19447a1198f838"},"schema_version":"1.0","source":{"id":"hep-ex/0202045","kind":"arxiv","version":1}},"canonical_sha256":"1e6ac1e2660789063bb6c3677116e549cd5dc88eacb0711630763be32f4c3e80","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1e6ac1e2660789063bb6c3677116e549cd5dc88eacb0711630763be32f4c3e80","first_computed_at":"2026-07-04T16:33:49.532291Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:33:49.532291Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"n3twDYWQrYJ2yEOS2C5fFV+1SHcCDepyw18Mg8h3gvDJBK9EEn/2rwDEXjAAmusR/JknyimOPlzN/lB1VpeSBg==","signature_status":"signed_v1","signed_at":"2026-07-04T16:33:49.532730Z","signed_message":"canonical_sha256_bytes"},"source_id":"hep-ex/0202045","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:463116630c961e9674951d677b2ecabeb2d3ac6d18444ef2a40f0f7db8ea0f60","sha256:8b20140da37041d10bebf039025a930777b66dd32d926baf7cb3204e9f503441"],"state_sha256":"c69ef9b9846089d58b9f6644b598c893c6b7e817d406e1938c1bfb0956799272"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dixZ/OSLIRe/9UZ/Ln1yxIpioBqYJ4BeSbTp+lQI9vVYb+vA6bInSNNZjkfeZfmcXXgdUh3DbfGPxQ2K9FIlCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T20:19:40.931911Z","bundle_sha256":"8579c860bde38b54013c6bd097f754413b56e9e08d31bdc2f4e3018aa1cb159b"}}