{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:VSI3N5PGES454ZKOVJYGJK2TWM","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":"3bcee3fcd317653088abfd5886f5f076f4962d343d79b659832d51132cd57867","cross_cats_sorted":["hep-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2016-10-10T16:30:56Z","title_canon_sha256":"b60b1403939054f8930001868eb3424821b365b00a9517a657f306cca1cbe457"},"schema_version":"1.0","source":{"id":"1610.02988","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.02988","created_at":"2026-05-18T00:53:20Z"},{"alias_kind":"arxiv_version","alias_value":"1610.02988v2","created_at":"2026-05-18T00:53:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.02988","created_at":"2026-05-18T00:53:20Z"},{"alias_kind":"pith_short_12","alias_value":"VSI3N5PGES45","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"VSI3N5PGES454ZKO","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"VSI3N5PG","created_at":"2026-05-18T12:30:48Z"}],"graph_snapshots":[{"event_id":"sha256:b18b36319654ef38d1588971c1e82cbe0682ad08e0df9df0531ce1d90daeb60a","target":"graph","created_at":"2026-05-18T00:53:20Z","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 report on a direct search for sub-GeV dark photons (A') which might be produced in the reaction e^- Z \\to e^- Z A' via kinetic mixing with photons by 100 GeV electrons incident on an active target in the NA64 experiment at the CERN SPS. The A's would decay invisibly into dark matter particles resulting in events with large missing energy. No evidence for such decays was found with 2.75\\cdot 10^{9} electrons on target. We set new limits on the \\gamma-A' mixing strength and exclude the invisible A' with a mass < 100 MeV as an explanation of the muon g_\\mu-2 anomaly.","authors_text":"A. E. Karneyeu, A. Fabich, A. Gardikiotis, A. N. Toropin, A. Rubbia, A. V. Dermenev, A. Yu. Trifonov, B. Ketzer, B. Radics, B. Vasilishin, D. A. Tlisov, D. Cooke, D. V. Kirpichnikov, D. V. Peshekhonov, E. Depero, F. Dubinin, G. Vasquez Arenas, K. Zhukov, K. Zioutas, L. V. Kravchuk, M. Hosgen, M. M. Kirsanov, NA64 Collaboration: D. Banerjee, N. V. Krasnikov, O. Petuhov, P. Crivelli, P. Ulloa, R. R. Dusaev, S. Emmenegger, S. G. Kovalenko, S. N. Gninenko, S. V. Donskov, S. V. Kuleshov, V. A. Kachanov, V. A. Kramarenko, V. A. Matveev, V. A. Polyakov, V. Burtsev, V. D. Peshekhonov, V. D. Samoylenko, V. E. Lyubovitskij, V. Lysan, V. N. Frolov, V. O. Tikhomirov, V. V. Myalkovskiy, Yu. V. Mikhailov","cross_cats":["hep-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2016-10-10T16:30:56Z","title":"Search for invisible decays of sub-GeV dark photons in missing-energy events at the CERN SPS"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.02988","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":"sha256:7af0b3a52e4c9e12006c6155c7d9c5bef7b4ffe009875b2a24bc7164aaba9562","target":"record","created_at":"2026-05-18T00:53:20Z","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":"3bcee3fcd317653088abfd5886f5f076f4962d343d79b659832d51132cd57867","cross_cats_sorted":["hep-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2016-10-10T16:30:56Z","title_canon_sha256":"b60b1403939054f8930001868eb3424821b365b00a9517a657f306cca1cbe457"},"schema_version":"1.0","source":{"id":"1610.02988","kind":"arxiv","version":2}},"canonical_sha256":"ac91b6f5e624b9de654eaa7064ab53b3247dcfbe28036e7e1d867eaae18783fd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ac91b6f5e624b9de654eaa7064ab53b3247dcfbe28036e7e1d867eaae18783fd","first_computed_at":"2026-05-18T00:53:20.600177Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:53:20.600177Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"qTb/TyKS0inNK4PFDTK7FzjuGMk8I3NcBB/OzzZQq155bBlSeKvuRflA0LUpIEK/GkWpV6zRcWw1FBDXGuZsBA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:53:20.600673Z","signed_message":"canonical_sha256_bytes"},"source_id":"1610.02988","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7af0b3a52e4c9e12006c6155c7d9c5bef7b4ffe009875b2a24bc7164aaba9562","sha256:b18b36319654ef38d1588971c1e82cbe0682ad08e0df9df0531ce1d90daeb60a"],"state_sha256":"f195172008b0f66489297fe7c10c551ed6eb1a0301bd0279add36bcc2fef00f8"}