{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:3XYI2NZPX4DYYMEA3E64HHP5MV","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":"048ee3bb76305da7c812fa47f1a4a3cddec7659a27cccf9878afa251a0844bcb","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2020-08-03T10:04:55Z","title_canon_sha256":"cc222715956e980edebc978ced2f7124bbd64cd2a64de3b09dbf098c05b19177"},"schema_version":"1.0","source":{"id":"2008.00749","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2008.00749","created_at":"2026-07-05T02:58:22Z"},{"alias_kind":"arxiv_version","alias_value":"2008.00749v2","created_at":"2026-07-05T02:58:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2008.00749","created_at":"2026-07-05T02:58:22Z"},{"alias_kind":"pith_short_12","alias_value":"3XYI2NZPX4DY","created_at":"2026-07-05T02:58:22Z"},{"alias_kind":"pith_short_16","alias_value":"3XYI2NZPX4DYYMEA","created_at":"2026-07-05T02:58:22Z"},{"alias_kind":"pith_short_8","alias_value":"3XYI2NZP","created_at":"2026-07-05T02:58:22Z"}],"graph_snapshots":[{"event_id":"sha256:8799a024d270226f82ab586f28828ac540c92bbf82b44e21e81c80b7b6a50731","target":"graph","created_at":"2026-07-05T02:58:22Z","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/2008.00749/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We constrain the lifetime of thermally produced Heavy Neutral Leptons (HNLs) from primordial nucleosynthesis. We show that even a small fraction of mesons present in the primordial plasma leads to the over-production of the primordial helium. This puts an upper bound on the lifetime of HNLs $\\tau_{N}<0.02$ s for masses $m_{N}>m_{\\pi}$ (as compared to 0.1 s reported previously). In combination with accelerator searches, this allows us to put a new lower bound on the HNLs masses and defining the \"bottom line\" for HNL searches at the future Intensity Frontier experiments.","authors_text":"Alexey Boyarsky, Maksym Ovchynnikov, Oleg Ruchayskiy, Vsevolod Syvolap","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2020-08-03T10:04:55Z","title":"Improved BBN constraints on Heavy Neutral Leptons"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2008.00749","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":"sha256:185de864b70850ce5ffabdaf869990f108aecd72c12b2191805334f84c842227","target":"record","created_at":"2026-07-05T02:58:22Z","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":"048ee3bb76305da7c812fa47f1a4a3cddec7659a27cccf9878afa251a0844bcb","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2020-08-03T10:04:55Z","title_canon_sha256":"cc222715956e980edebc978ced2f7124bbd64cd2a64de3b09dbf098c05b19177"},"schema_version":"1.0","source":{"id":"2008.00749","kind":"arxiv","version":2}},"canonical_sha256":"ddf08d372fbf078c3080d93dc39dfd65490058240257d8ca36717ea5ba327cab","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ddf08d372fbf078c3080d93dc39dfd65490058240257d8ca36717ea5ba327cab","first_computed_at":"2026-07-05T02:58:22.414072Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:58:22.414072Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mJW6VlsP3buoidq98rqOQyyjMH5xOPblJRbgnyzm6X1EcaZDqY0C19deocKcthevhEdxEO/wLlZIjqhUhORYBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T02:58:22.414524Z","signed_message":"canonical_sha256_bytes"},"source_id":"2008.00749","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:185de864b70850ce5ffabdaf869990f108aecd72c12b2191805334f84c842227","sha256:8799a024d270226f82ab586f28828ac540c92bbf82b44e21e81c80b7b6a50731"],"state_sha256":"dda2f2816816c302c8e20d614f85c3571d6ec1186d77d68acbf4d485c41fcb1e"}