{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:V6BKXQJIPCYFRTP6KVQ32YCU62","short_pith_number":"pith:V6BKXQJI","canonical_record":{"source":{"id":"1201.1442","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2012-01-06T16:19:17Z","cross_cats_sorted":[],"title_canon_sha256":"7de606a4ccc4fe48033238a4491c1e5cac6174cddc2525382bb7f8a65216f336","abstract_canon_sha256":"986778e31a886cf3f1c89e282a47dee183a846ee1c68fd8b0c53d8916bf999ff"},"schema_version":"1.0"},"canonical_sha256":"af82abc12878b058cdfe5561bd6054f6a126900cff3266913263f692b0f970a0","source":{"kind":"arxiv","id":"1201.1442","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1201.1442","created_at":"2026-05-18T02:21:18Z"},{"alias_kind":"arxiv_version","alias_value":"1201.1442v2","created_at":"2026-05-18T02:21:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1201.1442","created_at":"2026-05-18T02:21:18Z"},{"alias_kind":"pith_short_12","alias_value":"V6BKXQJIPCYF","created_at":"2026-05-18T12:27:25Z"},{"alias_kind":"pith_short_16","alias_value":"V6BKXQJIPCYFRTP6","created_at":"2026-05-18T12:27:25Z"},{"alias_kind":"pith_short_8","alias_value":"V6BKXQJI","created_at":"2026-05-18T12:27:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:V6BKXQJIPCYFRTP6KVQ32YCU62","target":"record","payload":{"canonical_record":{"source":{"id":"1201.1442","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2012-01-06T16:19:17Z","cross_cats_sorted":[],"title_canon_sha256":"7de606a4ccc4fe48033238a4491c1e5cac6174cddc2525382bb7f8a65216f336","abstract_canon_sha256":"986778e31a886cf3f1c89e282a47dee183a846ee1c68fd8b0c53d8916bf999ff"},"schema_version":"1.0"},"canonical_sha256":"af82abc12878b058cdfe5561bd6054f6a126900cff3266913263f692b0f970a0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:21:18.924611Z","signature_b64":"2nyX0gGDn2Ly2hyp5L+v+Z+MhDcaatNiEIJ4eFS6yYCMGijZ6aZGr0ibQtIWaE0JOnc/+EumOShi3q0cws97Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"af82abc12878b058cdfe5561bd6054f6a126900cff3266913263f692b0f970a0","last_reissued_at":"2026-05-18T02:21:18.924017Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:21:18.924017Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1201.1442","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:21:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QE9X4SiyM2L/h3eiwOlvnFqiS3B4fkYR62d0OvuBar208+H9dfoNzeQPCDRTnQex692CIca25Nu3WMPujGmCBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T10:58:42.887748Z"},"content_sha256":"5e85b41caba935be6fd73fecd483fbcf50ffe8fd719a19077b2e2a6b9620059b","schema_version":"1.0","event_id":"sha256:5e85b41caba935be6fd73fecd483fbcf50ffe8fd719a19077b2e2a6b9620059b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:V6BKXQJIPCYFRTP6KVQ32YCU62","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Methods for Optical Calibration of the BigBite Hadron Spectrometer","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. Camsonne, A. Shahinyan, B.D. Anderson, B.E. Norum, B. Moffit, B. Sawatzky, C.W. de Jager, D.J. Hamilton, D.W. Higinbotham, E. Long, E. Piasetzky, G. Jin, G. Ron, G. Rosner, J.J. LeRose, J. Juang, J.-O. Hansen, J.-P. Chen, J.R.M. Annand, J.W. Watson, K. Allada, K. Chirapatpimol, M. Mihovilovic, M. Shabestari, N. Liyanage, P. Monaghan, R.A. Lindgren, R. Michaels, R. Shneor, R. Subedi, R.W. Chan, S. Gilad, S. Riordan, S. Sirca, T. Averett, V. Nelyubin, V. Sulkosky, W. Korsch, X. Jiang, X. Qian, Y. Qiang, Y.-W. Zhang","submitted_at":"2012-01-06T16:19:17Z","abstract_excerpt":"The techniques for optical calibration of Jefferson Lab's large-acceptance magnetic hadron spectrometer, BigBite, have been examined. The most consistent and stable results were obtained by using a method based on singular value decomposition. In spite of the complexity of the optics, the particles' positions and momenta at the target have been precisely reconstructed from the coordinates measured in the detectors by means of a single back-tracing matrix. The technique is applicable to any similar magnetic spectrometer and any particle type. For 0.55 GeV/c protons, we have established the vert"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1201.1442","kind":"arxiv","version":2},"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":"2026-05-18T02:21:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7g+CTXgFqmT4dm4hqOrIiaGQZwvTfKDP6IQEpUBXd87P3StiTQwegwJjV2bKMsBqjVdk2WSSzY1obpoq4v/eAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T10:58:42.888457Z"},"content_sha256":"c899011caf703cd14b15d5f2410e689426044b9cbe4b62c059a687b97e0249f5","schema_version":"1.0","event_id":"sha256:c899011caf703cd14b15d5f2410e689426044b9cbe4b62c059a687b97e0249f5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/V6BKXQJIPCYFRTP6KVQ32YCU62/bundle.json","state_url":"https://pith.science/pith/V6BKXQJIPCYFRTP6KVQ32YCU62/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/V6BKXQJIPCYFRTP6KVQ32YCU62/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":"2026-05-27T10:58:42Z","links":{"resolver":"https://pith.science/pith/V6BKXQJIPCYFRTP6KVQ32YCU62","bundle":"https://pith.science/pith/V6BKXQJIPCYFRTP6KVQ32YCU62/bundle.json","state":"https://pith.science/pith/V6BKXQJIPCYFRTP6KVQ32YCU62/state.json","well_known_bundle":"https://pith.science/.well-known/pith/V6BKXQJIPCYFRTP6KVQ32YCU62/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:V6BKXQJIPCYFRTP6KVQ32YCU62","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":"986778e31a886cf3f1c89e282a47dee183a846ee1c68fd8b0c53d8916bf999ff","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2012-01-06T16:19:17Z","title_canon_sha256":"7de606a4ccc4fe48033238a4491c1e5cac6174cddc2525382bb7f8a65216f336"},"schema_version":"1.0","source":{"id":"1201.1442","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1201.1442","created_at":"2026-05-18T02:21:18Z"},{"alias_kind":"arxiv_version","alias_value":"1201.1442v2","created_at":"2026-05-18T02:21:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1201.1442","created_at":"2026-05-18T02:21:18Z"},{"alias_kind":"pith_short_12","alias_value":"V6BKXQJIPCYF","created_at":"2026-05-18T12:27:25Z"},{"alias_kind":"pith_short_16","alias_value":"V6BKXQJIPCYFRTP6","created_at":"2026-05-18T12:27:25Z"},{"alias_kind":"pith_short_8","alias_value":"V6BKXQJI","created_at":"2026-05-18T12:27:25Z"}],"graph_snapshots":[{"event_id":"sha256:c899011caf703cd14b15d5f2410e689426044b9cbe4b62c059a687b97e0249f5","target":"graph","created_at":"2026-05-18T02:21:18Z","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":"The techniques for optical calibration of Jefferson Lab's large-acceptance magnetic hadron spectrometer, BigBite, have been examined. The most consistent and stable results were obtained by using a method based on singular value decomposition. In spite of the complexity of the optics, the particles' positions and momenta at the target have been precisely reconstructed from the coordinates measured in the detectors by means of a single back-tracing matrix. The technique is applicable to any similar magnetic spectrometer and any particle type. For 0.55 GeV/c protons, we have established the vert","authors_text":"A. Camsonne, A. Shahinyan, B.D. Anderson, B.E. Norum, B. Moffit, B. Sawatzky, C.W. de Jager, D.J. Hamilton, D.W. Higinbotham, E. Long, E. Piasetzky, G. Jin, G. Ron, G. Rosner, J.J. LeRose, J. Juang, J.-O. Hansen, J.-P. Chen, J.R.M. Annand, J.W. Watson, K. Allada, K. Chirapatpimol, M. Mihovilovic, M. Shabestari, N. Liyanage, P. Monaghan, R.A. Lindgren, R. Michaels, R. Shneor, R. Subedi, R.W. Chan, S. Gilad, S. Riordan, S. Sirca, T. Averett, V. Nelyubin, V. Sulkosky, W. Korsch, X. Jiang, X. Qian, Y. Qiang, Y.-W. Zhang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2012-01-06T16:19:17Z","title":"Methods for Optical Calibration of the BigBite Hadron Spectrometer"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1201.1442","kind":"arxiv","version":2},"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":"sha256:5e85b41caba935be6fd73fecd483fbcf50ffe8fd719a19077b2e2a6b9620059b","target":"record","created_at":"2026-05-18T02:21:18Z","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":"986778e31a886cf3f1c89e282a47dee183a846ee1c68fd8b0c53d8916bf999ff","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2012-01-06T16:19:17Z","title_canon_sha256":"7de606a4ccc4fe48033238a4491c1e5cac6174cddc2525382bb7f8a65216f336"},"schema_version":"1.0","source":{"id":"1201.1442","kind":"arxiv","version":2}},"canonical_sha256":"af82abc12878b058cdfe5561bd6054f6a126900cff3266913263f692b0f970a0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"af82abc12878b058cdfe5561bd6054f6a126900cff3266913263f692b0f970a0","first_computed_at":"2026-05-18T02:21:18.924017Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:21:18.924017Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"2nyX0gGDn2Ly2hyp5L+v+Z+MhDcaatNiEIJ4eFS6yYCMGijZ6aZGr0ibQtIWaE0JOnc/+EumOShi3q0cws97Cw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:21:18.924611Z","signed_message":"canonical_sha256_bytes"},"source_id":"1201.1442","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5e85b41caba935be6fd73fecd483fbcf50ffe8fd719a19077b2e2a6b9620059b","sha256:c899011caf703cd14b15d5f2410e689426044b9cbe4b62c059a687b97e0249f5"],"state_sha256":"94b8c15692599733cbc4077ef86680dbe4d9cf40bb209683d387fb38243c13b2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7Vwr6dFGuKZCzWskyXYLIztDKRF2KbWsckUFnAJ0fKaCoXvaDtiAKDAvRlYjejjPbgp4s+DFkYdi7sljhbMxDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T10:58:42.892081Z","bundle_sha256":"9dd28d89ba2198158caa97ea949740ff814a7b4d96049b8aa3750085fd9b345e"}}