{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:IKULHA5ONL55RP5QFIFFTVBOW7","short_pith_number":"pith:IKULHA5O","canonical_record":{"source":{"id":"1604.08432","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2016-04-28T14:22:10Z","cross_cats_sorted":["hep-ex"],"title_canon_sha256":"a4374967c2110df704aad3706ad47a35c95813e85333d520c65168cc3b27c3be","abstract_canon_sha256":"283440853586ce11ee0b5c8ca66bba1032107b214ee995fd97f7c9fb1971d937"},"schema_version":"1.0"},"canonical_sha256":"42a8b383ae6afbd8bfb02a0a59d42eb7c87eef5697af1f6d5a75f4fb949efc8b","source":{"kind":"arxiv","id":"1604.08432","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.08432","created_at":"2026-05-18T00:55:46Z"},{"alias_kind":"arxiv_version","alias_value":"1604.08432v2","created_at":"2026-05-18T00:55:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.08432","created_at":"2026-05-18T00:55:46Z"},{"alias_kind":"pith_short_12","alias_value":"IKULHA5ONL55","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_16","alias_value":"IKULHA5ONL55RP5Q","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_8","alias_value":"IKULHA5O","created_at":"2026-05-18T12:30:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:IKULHA5ONL55RP5QFIFFTVBOW7","target":"record","payload":{"canonical_record":{"source":{"id":"1604.08432","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2016-04-28T14:22:10Z","cross_cats_sorted":["hep-ex"],"title_canon_sha256":"a4374967c2110df704aad3706ad47a35c95813e85333d520c65168cc3b27c3be","abstract_canon_sha256":"283440853586ce11ee0b5c8ca66bba1032107b214ee995fd97f7c9fb1971d937"},"schema_version":"1.0"},"canonical_sha256":"42a8b383ae6afbd8bfb02a0a59d42eb7c87eef5697af1f6d5a75f4fb949efc8b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:55:46.523374Z","signature_b64":"dkgyp1IV4cWWt5zvKwcnd2azqtnviMZkZ8OOkZVgqOMu51ehYf+tuAfQdWS++ic3xbfjjLQwY6F30k+3GnT7Dw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"42a8b383ae6afbd8bfb02a0a59d42eb7c87eef5697af1f6d5a75f4fb949efc8b","last_reissued_at":"2026-05-18T00:55:46.522843Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:55:46.522843Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1604.08432","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":"2026-05-18T00:55:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Zm9IpJKK8AWhhm9rQbCUlQcVV03ywMj/2YlBqhxUleLhhgXx8AvH9CitJcImQbj9aFnwpVmq45a4dfSFy/OkCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T17:10:08.446535Z"},"content_sha256":"495643dfa9b7bb31f07339ea22f0e5c3c2bac0a3626a01ccee95d8ec1858bedd","schema_version":"1.0","event_id":"sha256:495643dfa9b7bb31f07339ea22f0e5c3c2bac0a3626a01ccee95d8ec1858bedd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:IKULHA5ONL55RP5QFIFFTVBOW7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Missing energy signature from invisible decays of dark photons at the CERN SPS","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"D.V. Kirpichnikov, M.M. Kirsanov, N.V. Krasnikov, S.N. Gninenko","submitted_at":"2016-04-28T14:22:10Z","abstract_excerpt":"The dark photon ($A'$) production through the mixing with the bremsstrahlung photon from the electron scattering off nuclei can be accompanied by the dominant invisible $A'$ decay into dark-sector particles. In this work we discuss the missing energy signature of this process in the experiment NA64 aiming at the search for $A'\\to invisible$ decays with a high-energy electron beam at the CERN SPS. We show the distinctive distributions of variables that can be used to distinguish the $A'\\to invisible$ signal from background. The results of the detailed simulation of the detector response for the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.08432","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":"2026-05-18T00:55:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GByoAwvKG+ebHkIkw3YuaxXP5mYvLsw9OvS3zfnO/ytYf6SMiN6v1q+9iKw2P9Z1sMwaAvElM+3gDnyFyfkQCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T17:10:08.447050Z"},"content_sha256":"0c9fc2bb095b9b5d4f1487a335a39edfca7df4ac67e4117693dc280a1e2889da","schema_version":"1.0","event_id":"sha256:0c9fc2bb095b9b5d4f1487a335a39edfca7df4ac67e4117693dc280a1e2889da"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IKULHA5ONL55RP5QFIFFTVBOW7/bundle.json","state_url":"https://pith.science/pith/IKULHA5ONL55RP5QFIFFTVBOW7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IKULHA5ONL55RP5QFIFFTVBOW7/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":"2026-05-30T17:10:08Z","links":{"resolver":"https://pith.science/pith/IKULHA5ONL55RP5QFIFFTVBOW7","bundle":"https://pith.science/pith/IKULHA5ONL55RP5QFIFFTVBOW7/bundle.json","state":"https://pith.science/pith/IKULHA5ONL55RP5QFIFFTVBOW7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IKULHA5ONL55RP5QFIFFTVBOW7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:IKULHA5ONL55RP5QFIFFTVBOW7","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":"283440853586ce11ee0b5c8ca66bba1032107b214ee995fd97f7c9fb1971d937","cross_cats_sorted":["hep-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2016-04-28T14:22:10Z","title_canon_sha256":"a4374967c2110df704aad3706ad47a35c95813e85333d520c65168cc3b27c3be"},"schema_version":"1.0","source":{"id":"1604.08432","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.08432","created_at":"2026-05-18T00:55:46Z"},{"alias_kind":"arxiv_version","alias_value":"1604.08432v2","created_at":"2026-05-18T00:55:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.08432","created_at":"2026-05-18T00:55:46Z"},{"alias_kind":"pith_short_12","alias_value":"IKULHA5ONL55","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_16","alias_value":"IKULHA5ONL55RP5Q","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_8","alias_value":"IKULHA5O","created_at":"2026-05-18T12:30:22Z"}],"graph_snapshots":[{"event_id":"sha256:0c9fc2bb095b9b5d4f1487a335a39edfca7df4ac67e4117693dc280a1e2889da","target":"graph","created_at":"2026-05-18T00:55:46Z","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 dark photon ($A'$) production through the mixing with the bremsstrahlung photon from the electron scattering off nuclei can be accompanied by the dominant invisible $A'$ decay into dark-sector particles. In this work we discuss the missing energy signature of this process in the experiment NA64 aiming at the search for $A'\\to invisible$ decays with a high-energy electron beam at the CERN SPS. We show the distinctive distributions of variables that can be used to distinguish the $A'\\to invisible$ signal from background. The results of the detailed simulation of the detector response for the","authors_text":"D.V. Kirpichnikov, M.M. Kirsanov, N.V. Krasnikov, S.N. Gninenko","cross_cats":["hep-ex"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2016-04-28T14:22:10Z","title":"Missing energy signature from invisible decays of dark photons at the CERN SPS"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.08432","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":"sha256:495643dfa9b7bb31f07339ea22f0e5c3c2bac0a3626a01ccee95d8ec1858bedd","target":"record","created_at":"2026-05-18T00:55:46Z","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":"283440853586ce11ee0b5c8ca66bba1032107b214ee995fd97f7c9fb1971d937","cross_cats_sorted":["hep-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2016-04-28T14:22:10Z","title_canon_sha256":"a4374967c2110df704aad3706ad47a35c95813e85333d520c65168cc3b27c3be"},"schema_version":"1.0","source":{"id":"1604.08432","kind":"arxiv","version":2}},"canonical_sha256":"42a8b383ae6afbd8bfb02a0a59d42eb7c87eef5697af1f6d5a75f4fb949efc8b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"42a8b383ae6afbd8bfb02a0a59d42eb7c87eef5697af1f6d5a75f4fb949efc8b","first_computed_at":"2026-05-18T00:55:46.522843Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:55:46.522843Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dkgyp1IV4cWWt5zvKwcnd2azqtnviMZkZ8OOkZVgqOMu51ehYf+tuAfQdWS++ic3xbfjjLQwY6F30k+3GnT7Dw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:55:46.523374Z","signed_message":"canonical_sha256_bytes"},"source_id":"1604.08432","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:495643dfa9b7bb31f07339ea22f0e5c3c2bac0a3626a01ccee95d8ec1858bedd","sha256:0c9fc2bb095b9b5d4f1487a335a39edfca7df4ac67e4117693dc280a1e2889da"],"state_sha256":"c6f962866d1d3e2087a1983881fb48a32e633e1f83bd64b046c00b02ac468f63"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TY73JhTW2AQChA45W0lHKUMLAI+lFwtztaSDr9V0CSF6hvfYy5Qko7A3WMEDUSSaV//LfENyCp4MwZsSf+I1CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T17:10:08.449743Z","bundle_sha256":"38d471a87ba9c627ae3dd5357f23f2b9f2071645b29255b30970433f485f83b4"}}