{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:X75DYUDFEY3SX6A7DJFJALP4YA","short_pith_number":"pith:X75DYUDF","canonical_record":{"source":{"id":"1706.06483","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-06-20T14:33:59Z","cross_cats_sorted":["hep-ex","physics.ins-det"],"title_canon_sha256":"4164b079f850489bcfc96bc1bec3c407d056fa92bbc9118be60bb3df56533910","abstract_canon_sha256":"b528bdacb5901c69f428f804e969f8d144b0a9b3ce9ee26c174605bf2c919c5f"},"schema_version":"1.0"},"canonical_sha256":"bffa3c506526372bf81f1a4a902dfcc03dd8353fee3ed5be041c1fa3ba655759","source":{"kind":"arxiv","id":"1706.06483","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1706.06483","created_at":"2026-05-18T00:32:01Z"},{"alias_kind":"arxiv_version","alias_value":"1706.06483v2","created_at":"2026-05-18T00:32:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1706.06483","created_at":"2026-05-18T00:32:01Z"},{"alias_kind":"pith_short_12","alias_value":"X75DYUDFEY3S","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_16","alias_value":"X75DYUDFEY3SX6A7","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_8","alias_value":"X75DYUDF","created_at":"2026-05-18T12:31:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:X75DYUDFEY3SX6A7DJFJALP4YA","target":"record","payload":{"canonical_record":{"source":{"id":"1706.06483","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-06-20T14:33:59Z","cross_cats_sorted":["hep-ex","physics.ins-det"],"title_canon_sha256":"4164b079f850489bcfc96bc1bec3c407d056fa92bbc9118be60bb3df56533910","abstract_canon_sha256":"b528bdacb5901c69f428f804e969f8d144b0a9b3ce9ee26c174605bf2c919c5f"},"schema_version":"1.0"},"canonical_sha256":"bffa3c506526372bf81f1a4a902dfcc03dd8353fee3ed5be041c1fa3ba655759","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:32:01.037504Z","signature_b64":"Xemp5CVd9Wpo4LVNYE3CTtpih5TJE1wjDOFlUCzRTqDL+xRJHf954zXE9xS1nKXPVn6XPLt4JNL+PfsvRBLJDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bffa3c506526372bf81f1a4a902dfcc03dd8353fee3ed5be041c1fa3ba655759","last_reissued_at":"2026-05-18T00:32:01.037086Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:32:01.037086Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1706.06483","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":"2026-05-18T00:32:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tniBlgeEh8FWDkepFTa6zxMitvrc4fRlCWRimTNCYLlQkeR1AIXOQt45JPB3QjELNBXUHgMy0y/jSXQCisvCCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T04:37:54.307468Z"},"content_sha256":"52e77128f108e2f837849a4bcc681a0886ba1b8adf97b7cd1346c002fdf2e6fb","schema_version":"1.0","event_id":"sha256:52e77128f108e2f837849a4bcc681a0886ba1b8adf97b7cd1346c002fdf2e6fb"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:X75DYUDFEY3SX6A7DJFJALP4YA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Performance measurement of HARPO: a Time Projection Chamber as a gamma-ray telescope and polarimeter","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex","physics.ins-det"],"primary_cat":"astro-ph.IM","authors_text":"A. Delbart, A. Takemoto, B. Giebels, D. Atti\\'e, D. Baudin, D. Bernard, D. Calvet, D. G\\\"otz, D. Horan, F. Magniette, H. Ohkuma, I. Semeniouk, M. Frotin, M. Louzir, M. Yamaguchi, P. Baron, P. Bruel, P. Colas, P. Gros, P. Poilleux, P. Sizun, R. Yonamine, S. Amano, S. Dat\\'e, S. Hashimoto, S. Miyamoto, S. Wang, T. Kotaka, Y. Geerebaert, Y. Minamiyama","submitted_at":"2017-06-20T14:33:59Z","abstract_excerpt":"We analyse the performance of a gas time projection chamber (TPC) as a high-performance gamma-ray telescope and polarimeter in the e$^+$e$^-$ pair creation regime. We use data collected at a gamma-ray beam of known polarisation. The TPC provides two orthogonal projections $(x,z)$ and $(y,z)$ of the tracks induced by each conversion in the gas volume. We use a simple vertex finder in which vertices and pseudo-tracks exiting from them are identified.\n  We study the various contributions to the single-photon angular resolution using Monte Carlo simulations and compare them with the experimental d"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1706.06483","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":"2026-05-18T00:32:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BJXc5B3OZSWiJrXPYRDZILIPtBYE69qds+wDw8Le40fLr5cSj6GCMnIXHpvaw/DIoNKeM6xXHja4ZkMckabnCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T04:37:54.307821Z"},"content_sha256":"7f5db17ebb84aadf79ebf86082e23cc631598d1c39f5c589ce4fe1a156505ee4","schema_version":"1.0","event_id":"sha256:7f5db17ebb84aadf79ebf86082e23cc631598d1c39f5c589ce4fe1a156505ee4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/X75DYUDFEY3SX6A7DJFJALP4YA/bundle.json","state_url":"https://pith.science/pith/X75DYUDFEY3SX6A7DJFJALP4YA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/X75DYUDFEY3SX6A7DJFJALP4YA/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":"2026-06-02T04:37:54Z","links":{"resolver":"https://pith.science/pith/X75DYUDFEY3SX6A7DJFJALP4YA","bundle":"https://pith.science/pith/X75DYUDFEY3SX6A7DJFJALP4YA/bundle.json","state":"https://pith.science/pith/X75DYUDFEY3SX6A7DJFJALP4YA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/X75DYUDFEY3SX6A7DJFJALP4YA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:X75DYUDFEY3SX6A7DJFJALP4YA","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":"b528bdacb5901c69f428f804e969f8d144b0a9b3ce9ee26c174605bf2c919c5f","cross_cats_sorted":["hep-ex","physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-06-20T14:33:59Z","title_canon_sha256":"4164b079f850489bcfc96bc1bec3c407d056fa92bbc9118be60bb3df56533910"},"schema_version":"1.0","source":{"id":"1706.06483","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1706.06483","created_at":"2026-05-18T00:32:01Z"},{"alias_kind":"arxiv_version","alias_value":"1706.06483v2","created_at":"2026-05-18T00:32:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1706.06483","created_at":"2026-05-18T00:32:01Z"},{"alias_kind":"pith_short_12","alias_value":"X75DYUDFEY3S","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_16","alias_value":"X75DYUDFEY3SX6A7","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_8","alias_value":"X75DYUDF","created_at":"2026-05-18T12:31:53Z"}],"graph_snapshots":[{"event_id":"sha256:7f5db17ebb84aadf79ebf86082e23cc631598d1c39f5c589ce4fe1a156505ee4","target":"graph","created_at":"2026-05-18T00:32:01Z","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":"We analyse the performance of a gas time projection chamber (TPC) as a high-performance gamma-ray telescope and polarimeter in the e$^+$e$^-$ pair creation regime. We use data collected at a gamma-ray beam of known polarisation. The TPC provides two orthogonal projections $(x,z)$ and $(y,z)$ of the tracks induced by each conversion in the gas volume. We use a simple vertex finder in which vertices and pseudo-tracks exiting from them are identified.\n  We study the various contributions to the single-photon angular resolution using Monte Carlo simulations and compare them with the experimental d","authors_text":"A. Delbart, A. Takemoto, B. Giebels, D. Atti\\'e, D. Baudin, D. Bernard, D. Calvet, D. G\\\"otz, D. Horan, F. Magniette, H. Ohkuma, I. Semeniouk, M. Frotin, M. Louzir, M. Yamaguchi, P. Baron, P. Bruel, P. Colas, P. Gros, P. Poilleux, P. Sizun, R. Yonamine, S. Amano, S. Dat\\'e, S. Hashimoto, S. Miyamoto, S. Wang, T. Kotaka, Y. Geerebaert, Y. Minamiyama","cross_cats":["hep-ex","physics.ins-det"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-06-20T14:33:59Z","title":"Performance measurement of HARPO: a Time Projection Chamber as a gamma-ray telescope and polarimeter"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1706.06483","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":"sha256:52e77128f108e2f837849a4bcc681a0886ba1b8adf97b7cd1346c002fdf2e6fb","target":"record","created_at":"2026-05-18T00:32:01Z","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":"b528bdacb5901c69f428f804e969f8d144b0a9b3ce9ee26c174605bf2c919c5f","cross_cats_sorted":["hep-ex","physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-06-20T14:33:59Z","title_canon_sha256":"4164b079f850489bcfc96bc1bec3c407d056fa92bbc9118be60bb3df56533910"},"schema_version":"1.0","source":{"id":"1706.06483","kind":"arxiv","version":2}},"canonical_sha256":"bffa3c506526372bf81f1a4a902dfcc03dd8353fee3ed5be041c1fa3ba655759","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bffa3c506526372bf81f1a4a902dfcc03dd8353fee3ed5be041c1fa3ba655759","first_computed_at":"2026-05-18T00:32:01.037086Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:32:01.037086Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Xemp5CVd9Wpo4LVNYE3CTtpih5TJE1wjDOFlUCzRTqDL+xRJHf954zXE9xS1nKXPVn6XPLt4JNL+PfsvRBLJDA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:32:01.037504Z","signed_message":"canonical_sha256_bytes"},"source_id":"1706.06483","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:52e77128f108e2f837849a4bcc681a0886ba1b8adf97b7cd1346c002fdf2e6fb","sha256:7f5db17ebb84aadf79ebf86082e23cc631598d1c39f5c589ce4fe1a156505ee4"],"state_sha256":"944892ee2961f33263bcc829e4e4ca2d80bc09f77082cec9b43d229e1c14b644"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dhI3SrMFmf2TWXi1JaCDu4y2hsuLuoplr1TkDCATZkkE5BEviKi/2Zh/JBgXgon8hjYS7MShop6PGIEsmmnEAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T04:37:54.309878Z","bundle_sha256":"76c6f99ab77273e3bf39bc9c8ad913738977d8cf0ec89acf392da15774678e28"}}