{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:LBHVVJEU2SROFADAMVU3XKYYB5","short_pith_number":"pith:LBHVVJEU","canonical_record":{"source":{"id":"1806.02755","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2018-06-07T16:18:05Z","cross_cats_sorted":[],"title_canon_sha256":"43f749c8a19c2f42a75cffd97aba829b5008b499510de0cd9bf1243420275fcd","abstract_canon_sha256":"894db63f578a9e789e6ad20a7a17eb03ebcac7beb48fbd5361397f30c3e4856b"},"schema_version":"1.0"},"canonical_sha256":"584f5aa494d4a2e280606569bbab180f430fd732c10c536adbb0c187c3fafb0a","source":{"kind":"arxiv","id":"1806.02755","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1806.02755","created_at":"2026-05-18T00:13:55Z"},{"alias_kind":"arxiv_version","alias_value":"1806.02755v1","created_at":"2026-05-18T00:13:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1806.02755","created_at":"2026-05-18T00:13:55Z"},{"alias_kind":"pith_short_12","alias_value":"LBHVVJEU2SRO","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_16","alias_value":"LBHVVJEU2SROFADA","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_8","alias_value":"LBHVVJEU","created_at":"2026-05-18T12:32:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:LBHVVJEU2SROFADAMVU3XKYYB5","target":"record","payload":{"canonical_record":{"source":{"id":"1806.02755","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2018-06-07T16:18:05Z","cross_cats_sorted":[],"title_canon_sha256":"43f749c8a19c2f42a75cffd97aba829b5008b499510de0cd9bf1243420275fcd","abstract_canon_sha256":"894db63f578a9e789e6ad20a7a17eb03ebcac7beb48fbd5361397f30c3e4856b"},"schema_version":"1.0"},"canonical_sha256":"584f5aa494d4a2e280606569bbab180f430fd732c10c536adbb0c187c3fafb0a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:13:55.742519Z","signature_b64":"kUVfqmVmbohb0KcH+7FEq+KLBDum1msq7L8T/9jMbw0ZLORasltak5JT4+DK4z7vsLoqvP0/G1yes7JmTWm+CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"584f5aa494d4a2e280606569bbab180f430fd732c10c536adbb0c187c3fafb0a","last_reissued_at":"2026-05-18T00:13:55.741960Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:13:55.741960Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1806.02755","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":"2026-05-18T00:13:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tBiJi9kH98Kip78bGOQl+86gO2yQC0gatkepP7PS7rtaclsP+CbCuQ5Ndmw4xEf7e9be7IdIFrDTyKzJrPWdDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T09:21:59.532022Z"},"content_sha256":"43797876843870b6db95f4ef2ba8f97e767fb6ab7302639bb3f88814dedf5c54","schema_version":"1.0","event_id":"sha256:43797876843870b6db95f4ef2ba8f97e767fb6ab7302639bb3f88814dedf5c54"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:LBHVVJEU2SROFADAMVU3XKYYB5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Solving a Fine-Tuning Problem of the Standard Model through the Introduction of Vector-Like Quarks","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"F. J. Botella, G. C. Branco, J. I. Silva-Marcos, M. Nebot, M. N. Rebelo","submitted_at":"2018-06-07T16:18:05Z","abstract_excerpt":"We emphasise that even in the extreme chiral limit where only the top and bottom quarks acquire mass, quark mixing is physically meaningful. This implies that the natural value of $|V_{13}|^2 + |V_{23}|^2$ is of order one, which is to be compared to its experimental value of order $10^{-3}$ . We show how this fine-tuning problem of the Standard Model can be solved through an extension of the Standard Model where vector-like quarks and a complex singlet are introduced, together with a flavour symmetry. The mixings of the light quarks are generated through the mixing of the vector-like quarks wi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1806.02755","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":"2026-05-18T00:13:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TBk0P4BDgzkMCx/a/P0J4ksV0eEDoLh7544UZJUuTgtYCSy1HZMvk2W+MyK2EdtiQSO43O6I7GoEwzR9hJ64Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T09:21:59.532735Z"},"content_sha256":"bb63d3ea366d468c5ef0fa422c20c7d321af8a51b450995bfdd9a1cc8541eb0b","schema_version":"1.0","event_id":"sha256:bb63d3ea366d468c5ef0fa422c20c7d321af8a51b450995bfdd9a1cc8541eb0b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LBHVVJEU2SROFADAMVU3XKYYB5/bundle.json","state_url":"https://pith.science/pith/LBHVVJEU2SROFADAMVU3XKYYB5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LBHVVJEU2SROFADAMVU3XKYYB5/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":"2026-05-25T09:21:59Z","links":{"resolver":"https://pith.science/pith/LBHVVJEU2SROFADAMVU3XKYYB5","bundle":"https://pith.science/pith/LBHVVJEU2SROFADAMVU3XKYYB5/bundle.json","state":"https://pith.science/pith/LBHVVJEU2SROFADAMVU3XKYYB5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LBHVVJEU2SROFADAMVU3XKYYB5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:LBHVVJEU2SROFADAMVU3XKYYB5","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":"894db63f578a9e789e6ad20a7a17eb03ebcac7beb48fbd5361397f30c3e4856b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2018-06-07T16:18:05Z","title_canon_sha256":"43f749c8a19c2f42a75cffd97aba829b5008b499510de0cd9bf1243420275fcd"},"schema_version":"1.0","source":{"id":"1806.02755","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1806.02755","created_at":"2026-05-18T00:13:55Z"},{"alias_kind":"arxiv_version","alias_value":"1806.02755v1","created_at":"2026-05-18T00:13:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1806.02755","created_at":"2026-05-18T00:13:55Z"},{"alias_kind":"pith_short_12","alias_value":"LBHVVJEU2SRO","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_16","alias_value":"LBHVVJEU2SROFADA","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_8","alias_value":"LBHVVJEU","created_at":"2026-05-18T12:32:33Z"}],"graph_snapshots":[{"event_id":"sha256:bb63d3ea366d468c5ef0fa422c20c7d321af8a51b450995bfdd9a1cc8541eb0b","target":"graph","created_at":"2026-05-18T00:13:55Z","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 emphasise that even in the extreme chiral limit where only the top and bottom quarks acquire mass, quark mixing is physically meaningful. This implies that the natural value of $|V_{13}|^2 + |V_{23}|^2$ is of order one, which is to be compared to its experimental value of order $10^{-3}$ . We show how this fine-tuning problem of the Standard Model can be solved through an extension of the Standard Model where vector-like quarks and a complex singlet are introduced, together with a flavour symmetry. The mixings of the light quarks are generated through the mixing of the vector-like quarks wi","authors_text":"F. J. Botella, G. C. Branco, J. I. Silva-Marcos, M. Nebot, M. N. Rebelo","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2018-06-07T16:18:05Z","title":"Solving a Fine-Tuning Problem of the Standard Model through the Introduction of Vector-Like Quarks"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1806.02755","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":"sha256:43797876843870b6db95f4ef2ba8f97e767fb6ab7302639bb3f88814dedf5c54","target":"record","created_at":"2026-05-18T00:13:55Z","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":"894db63f578a9e789e6ad20a7a17eb03ebcac7beb48fbd5361397f30c3e4856b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2018-06-07T16:18:05Z","title_canon_sha256":"43f749c8a19c2f42a75cffd97aba829b5008b499510de0cd9bf1243420275fcd"},"schema_version":"1.0","source":{"id":"1806.02755","kind":"arxiv","version":1}},"canonical_sha256":"584f5aa494d4a2e280606569bbab180f430fd732c10c536adbb0c187c3fafb0a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"584f5aa494d4a2e280606569bbab180f430fd732c10c536adbb0c187c3fafb0a","first_computed_at":"2026-05-18T00:13:55.741960Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:13:55.741960Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kUVfqmVmbohb0KcH+7FEq+KLBDum1msq7L8T/9jMbw0ZLORasltak5JT4+DK4z7vsLoqvP0/G1yes7JmTWm+CA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:13:55.742519Z","signed_message":"canonical_sha256_bytes"},"source_id":"1806.02755","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:43797876843870b6db95f4ef2ba8f97e767fb6ab7302639bb3f88814dedf5c54","sha256:bb63d3ea366d468c5ef0fa422c20c7d321af8a51b450995bfdd9a1cc8541eb0b"],"state_sha256":"34dcce3123c369a6f3d8e767d9cbd91a0abd70734a17f5b6b19e1d93ca14119f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ui/UZr5P57Hhs0KA0sAdZsGOH27n3mn78SMJSMHVF+p/UO7WUq79rVucB+WAyZOyE79bErdaKeNqPi9jqdfBAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T09:21:59.536700Z","bundle_sha256":"7740c7c4e2000c343b76fda869f13d1b87e63437a3939d4031d0cfb08ee7c4e0"}}