{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:NW4CUJFP56AK32ITUTWGVJGRMH","short_pith_number":"pith:NW4CUJFP","canonical_record":{"source":{"id":"0909.2104","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2009-09-11T07:45:39Z","cross_cats_sorted":["nucl-ex"],"title_canon_sha256":"ce403415b43b51a64ff129cd197a7352882093bfcd13d0a3fcefb7435fda1ff8","abstract_canon_sha256":"c8ce7799f2826ed762bea5c364b3a597c9a07c3408210d672e1bd2c0af96e8a3"},"schema_version":"1.0"},"canonical_sha256":"6db82a24afef80ade913a4ec6aa4d161c76f3b2d781dae10ae6253565db62847","source":{"kind":"arxiv","id":"0909.2104","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.2104","created_at":"2026-05-18T04:21:30Z"},{"alias_kind":"arxiv_version","alias_value":"0909.2104v1","created_at":"2026-05-18T04:21:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.2104","created_at":"2026-05-18T04:21:30Z"},{"alias_kind":"pith_short_12","alias_value":"NW4CUJFP56AK","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"NW4CUJFP56AK32IT","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"NW4CUJFP","created_at":"2026-05-18T12:26:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:NW4CUJFP56AK32ITUTWGVJGRMH","target":"record","payload":{"canonical_record":{"source":{"id":"0909.2104","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2009-09-11T07:45:39Z","cross_cats_sorted":["nucl-ex"],"title_canon_sha256":"ce403415b43b51a64ff129cd197a7352882093bfcd13d0a3fcefb7435fda1ff8","abstract_canon_sha256":"c8ce7799f2826ed762bea5c364b3a597c9a07c3408210d672e1bd2c0af96e8a3"},"schema_version":"1.0"},"canonical_sha256":"6db82a24afef80ade913a4ec6aa4d161c76f3b2d781dae10ae6253565db62847","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:21:30.124114Z","signature_b64":"JqwY4YhRWaraOgpL2bhicpDsiWxtS7SlY4P2KAFQHG930Yz9HWTTV3NAk/fDkCkC8i7d+Ef0Bl4Tn+L0BQKFCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6db82a24afef80ade913a4ec6aa4d161c76f3b2d781dae10ae6253565db62847","last_reissued_at":"2026-05-18T04:21:30.123401Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:21:30.123401Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0909.2104","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:21:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/UElexreMzFXKT4J6Xq2a/pkwwv+7xaxgocg+ntxWmot3OHBkqrlg8GDjh95jjbrexKmT93QJa06duLjpU4aDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T23:17:24.233238Z"},"content_sha256":"2d0404b900c014f4e0bf977316acdf71a00594a89b87b82a25c03cff2aa1aee4","schema_version":"1.0","event_id":"sha256:2d0404b900c014f4e0bf977316acdf71a00594a89b87b82a25c03cff2aa1aee4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:NW4CUJFP56AK32ITUTWGVJGRMH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Neutrino mass limit from tritium beta decay","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-ex"],"primary_cat":"hep-ex","authors_text":"C. Weinheimer, E. W. Otten","submitted_at":"2009-09-11T07:45:39Z","abstract_excerpt":"The paper reviews recent experiments on tritium beta spectroscopy searching for the absolute value of the electron neutrino mass $m(\\nu_e)$. By use of dedicated electrostatic filters with high acceptance and resolution, the uncertainty on the observable $m^2(\\nu_e)$ has been pushed down to about 3 eV$^2$. The new upper limit of the mass is $m(\\nu_e) < 2$ eV at 95% C.L. In view of erroneous and unphysical mass results obtained by some earlier experiments in beta decay, particular attention is paid to systematic effects. The mass limit is discussed in the context of current neutrino research in "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.2104","kind":"arxiv","version":1},"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":"2026-05-18T04:21:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"d4g72dBgt2OM9QDLKPpq97j7KCNYqifWqqzNQUtVHbDnCtEQvZg71m/MzjWxY9XG9KIWRI8Y4Owzzy1sYn7FAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T23:17:24.233649Z"},"content_sha256":"db03c6e80aac57d9c63221455f80c8afb1b8a96366e315bc7f46edf9ace3d5f3","schema_version":"1.0","event_id":"sha256:db03c6e80aac57d9c63221455f80c8afb1b8a96366e315bc7f46edf9ace3d5f3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NW4CUJFP56AK32ITUTWGVJGRMH/bundle.json","state_url":"https://pith.science/pith/NW4CUJFP56AK32ITUTWGVJGRMH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NW4CUJFP56AK32ITUTWGVJGRMH/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":"2026-05-27T23:17:24Z","links":{"resolver":"https://pith.science/pith/NW4CUJFP56AK32ITUTWGVJGRMH","bundle":"https://pith.science/pith/NW4CUJFP56AK32ITUTWGVJGRMH/bundle.json","state":"https://pith.science/pith/NW4CUJFP56AK32ITUTWGVJGRMH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NW4CUJFP56AK32ITUTWGVJGRMH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:NW4CUJFP56AK32ITUTWGVJGRMH","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":"c8ce7799f2826ed762bea5c364b3a597c9a07c3408210d672e1bd2c0af96e8a3","cross_cats_sorted":["nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2009-09-11T07:45:39Z","title_canon_sha256":"ce403415b43b51a64ff129cd197a7352882093bfcd13d0a3fcefb7435fda1ff8"},"schema_version":"1.0","source":{"id":"0909.2104","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.2104","created_at":"2026-05-18T04:21:30Z"},{"alias_kind":"arxiv_version","alias_value":"0909.2104v1","created_at":"2026-05-18T04:21:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.2104","created_at":"2026-05-18T04:21:30Z"},{"alias_kind":"pith_short_12","alias_value":"NW4CUJFP56AK","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"NW4CUJFP56AK32IT","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"NW4CUJFP","created_at":"2026-05-18T12:26:00Z"}],"graph_snapshots":[{"event_id":"sha256:db03c6e80aac57d9c63221455f80c8afb1b8a96366e315bc7f46edf9ace3d5f3","target":"graph","created_at":"2026-05-18T04:21:30Z","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 paper reviews recent experiments on tritium beta spectroscopy searching for the absolute value of the electron neutrino mass $m(\\nu_e)$. By use of dedicated electrostatic filters with high acceptance and resolution, the uncertainty on the observable $m^2(\\nu_e)$ has been pushed down to about 3 eV$^2$. The new upper limit of the mass is $m(\\nu_e) < 2$ eV at 95% C.L. In view of erroneous and unphysical mass results obtained by some earlier experiments in beta decay, particular attention is paid to systematic effects. The mass limit is discussed in the context of current neutrino research in ","authors_text":"C. Weinheimer, E. W. Otten","cross_cats":["nucl-ex"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2009-09-11T07:45:39Z","title":"Neutrino mass limit from tritium beta decay"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.2104","kind":"arxiv","version":1},"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":"sha256:2d0404b900c014f4e0bf977316acdf71a00594a89b87b82a25c03cff2aa1aee4","target":"record","created_at":"2026-05-18T04:21:30Z","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":"c8ce7799f2826ed762bea5c364b3a597c9a07c3408210d672e1bd2c0af96e8a3","cross_cats_sorted":["nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2009-09-11T07:45:39Z","title_canon_sha256":"ce403415b43b51a64ff129cd197a7352882093bfcd13d0a3fcefb7435fda1ff8"},"schema_version":"1.0","source":{"id":"0909.2104","kind":"arxiv","version":1}},"canonical_sha256":"6db82a24afef80ade913a4ec6aa4d161c76f3b2d781dae10ae6253565db62847","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6db82a24afef80ade913a4ec6aa4d161c76f3b2d781dae10ae6253565db62847","first_computed_at":"2026-05-18T04:21:30.123401Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:21:30.123401Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"JqwY4YhRWaraOgpL2bhicpDsiWxtS7SlY4P2KAFQHG930Yz9HWTTV3NAk/fDkCkC8i7d+Ef0Bl4Tn+L0BQKFCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:21:30.124114Z","signed_message":"canonical_sha256_bytes"},"source_id":"0909.2104","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2d0404b900c014f4e0bf977316acdf71a00594a89b87b82a25c03cff2aa1aee4","sha256:db03c6e80aac57d9c63221455f80c8afb1b8a96366e315bc7f46edf9ace3d5f3"],"state_sha256":"deb91f644c37bb4aaece52857e1a38bec1f1f7b51674860453afd87f210e118e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DPRqISjyK6plNNkcDHGv5t+3uufYoCIrO30FPOGkwk7W+1pY8i7JKfo8L0SdW/e505hFxQsS4UO0hRx0EH0kBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T23:17:24.236004Z","bundle_sha256":"9272203512a2ecb62f638ac1379fe7e8cec8d6affe43f98229a0c29433ff32f5"}}