{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:NDF7UEWTJVVC7OEKR37NASSJQK","short_pith_number":"pith:NDF7UEWT","canonical_record":{"source":{"id":"1405.3019","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2014-05-13T02:56:08Z","cross_cats_sorted":[],"title_canon_sha256":"7a526b2ee2ba7737849922db6b495fc4b5ac7394d66c9f50d10cdf9b6ae3b167","abstract_canon_sha256":"9699c3be11d204efd9e3b8c47a11c5a40161bb71af8c42041434d4ee4c5ce88f"},"schema_version":"1.0"},"canonical_sha256":"68cbfa12d34d6a2fb88a8efed04a4982992309e254fa734fe97d26f45ceee498","source":{"kind":"arxiv","id":"1405.3019","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1405.3019","created_at":"2026-05-18T02:46:15Z"},{"alias_kind":"arxiv_version","alias_value":"1405.3019v1","created_at":"2026-05-18T02:46:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1405.3019","created_at":"2026-05-18T02:46:15Z"},{"alias_kind":"pith_short_12","alias_value":"NDF7UEWTJVVC","created_at":"2026-05-18T12:28:41Z"},{"alias_kind":"pith_short_16","alias_value":"NDF7UEWTJVVC7OEK","created_at":"2026-05-18T12:28:41Z"},{"alias_kind":"pith_short_8","alias_value":"NDF7UEWT","created_at":"2026-05-18T12:28:41Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:NDF7UEWTJVVC7OEKR37NASSJQK","target":"record","payload":{"canonical_record":{"source":{"id":"1405.3019","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2014-05-13T02:56:08Z","cross_cats_sorted":[],"title_canon_sha256":"7a526b2ee2ba7737849922db6b495fc4b5ac7394d66c9f50d10cdf9b6ae3b167","abstract_canon_sha256":"9699c3be11d204efd9e3b8c47a11c5a40161bb71af8c42041434d4ee4c5ce88f"},"schema_version":"1.0"},"canonical_sha256":"68cbfa12d34d6a2fb88a8efed04a4982992309e254fa734fe97d26f45ceee498","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:46:15.812434Z","signature_b64":"boMChSNNE3cUg3GcKFfqiHOzsWxx6i/1NVcNU7Puow/zuG8CxmPo2BOb2rUweD+KY32f0+yTufXcSOzg1EbZBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"68cbfa12d34d6a2fb88a8efed04a4982992309e254fa734fe97d26f45ceee498","last_reissued_at":"2026-05-18T02:46:15.811899Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:46:15.811899Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1405.3019","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":"2026-05-18T02:46:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nkSd84KPuGP7hw6Ni3Hb52GBeROjsY9KykPFAzzaJmLEUyinjOUod4G9Ek1+W/BSwnuXC827B1Eh92c7mqeODw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T12:58:10.175936Z"},"content_sha256":"aa4fd94ffa66a2c9c6d880fe26d48255898302029fea17c4de55e51a51effcff","schema_version":"1.0","event_id":"sha256:aa4fd94ffa66a2c9c6d880fe26d48255898302029fea17c4de55e51a51effcff"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:NDF7UEWTJVVC7OEKR37NASSJQK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Feynman-Hellmann approach to the spin structure of hadrons","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-lat","authors_text":"A. J. Chambers, A. Schiller, D. Pleiter, G. Schierholz, H. Perlt, H. St\\\"uben, J. M. Zanotti, P. E. L. Rakow, R. D. Young, R. Horsley, Y. Nakamura","submitted_at":"2014-05-13T02:56:08Z","abstract_excerpt":"We perform a Nf = 2 + 1 lattice QCD simulation to determine the quark spin fractions of hadrons using the Feynman-Hellmann theorem. By introducing an external spin operator to the fermion action, the matrix elements relevant for quark spin fractions are extracted from the linear response of the hadron energies. Simulations indicate that the Feynman-Hellmann method offers statistical precision that is comparable to the standard three-point function approach, with the added benefit that it is less susceptible to excited state contamination. This suggests that the Feynman-Hellmann technique offer"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1405.3019","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":"2026-05-18T02:46:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"keF/sxS7phPCrApDuzCIzKlow7qFqWcUHHAzsyR1H+bTpMpBLg290QqpZRIJwPfaanMPK2clYe3l8WP/iTpqAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T12:58:10.176542Z"},"content_sha256":"9c5e31a16b17275148ad06570a907689ed14685f9c21cbe6518dc67b48ad0923","schema_version":"1.0","event_id":"sha256:9c5e31a16b17275148ad06570a907689ed14685f9c21cbe6518dc67b48ad0923"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NDF7UEWTJVVC7OEKR37NASSJQK/bundle.json","state_url":"https://pith.science/pith/NDF7UEWTJVVC7OEKR37NASSJQK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NDF7UEWTJVVC7OEKR37NASSJQK/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":"2026-05-26T12:58:10Z","links":{"resolver":"https://pith.science/pith/NDF7UEWTJVVC7OEKR37NASSJQK","bundle":"https://pith.science/pith/NDF7UEWTJVVC7OEKR37NASSJQK/bundle.json","state":"https://pith.science/pith/NDF7UEWTJVVC7OEKR37NASSJQK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NDF7UEWTJVVC7OEKR37NASSJQK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:NDF7UEWTJVVC7OEKR37NASSJQK","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":"9699c3be11d204efd9e3b8c47a11c5a40161bb71af8c42041434d4ee4c5ce88f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2014-05-13T02:56:08Z","title_canon_sha256":"7a526b2ee2ba7737849922db6b495fc4b5ac7394d66c9f50d10cdf9b6ae3b167"},"schema_version":"1.0","source":{"id":"1405.3019","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1405.3019","created_at":"2026-05-18T02:46:15Z"},{"alias_kind":"arxiv_version","alias_value":"1405.3019v1","created_at":"2026-05-18T02:46:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1405.3019","created_at":"2026-05-18T02:46:15Z"},{"alias_kind":"pith_short_12","alias_value":"NDF7UEWTJVVC","created_at":"2026-05-18T12:28:41Z"},{"alias_kind":"pith_short_16","alias_value":"NDF7UEWTJVVC7OEK","created_at":"2026-05-18T12:28:41Z"},{"alias_kind":"pith_short_8","alias_value":"NDF7UEWT","created_at":"2026-05-18T12:28:41Z"}],"graph_snapshots":[{"event_id":"sha256:9c5e31a16b17275148ad06570a907689ed14685f9c21cbe6518dc67b48ad0923","target":"graph","created_at":"2026-05-18T02:46:15Z","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 perform a Nf = 2 + 1 lattice QCD simulation to determine the quark spin fractions of hadrons using the Feynman-Hellmann theorem. By introducing an external spin operator to the fermion action, the matrix elements relevant for quark spin fractions are extracted from the linear response of the hadron energies. Simulations indicate that the Feynman-Hellmann method offers statistical precision that is comparable to the standard three-point function approach, with the added benefit that it is less susceptible to excited state contamination. This suggests that the Feynman-Hellmann technique offer","authors_text":"A. J. Chambers, A. Schiller, D. Pleiter, G. Schierholz, H. Perlt, H. St\\\"uben, J. M. Zanotti, P. E. L. Rakow, R. D. Young, R. Horsley, Y. Nakamura","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2014-05-13T02:56:08Z","title":"A Feynman-Hellmann approach to the spin structure of hadrons"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1405.3019","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:aa4fd94ffa66a2c9c6d880fe26d48255898302029fea17c4de55e51a51effcff","target":"record","created_at":"2026-05-18T02:46:15Z","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":"9699c3be11d204efd9e3b8c47a11c5a40161bb71af8c42041434d4ee4c5ce88f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2014-05-13T02:56:08Z","title_canon_sha256":"7a526b2ee2ba7737849922db6b495fc4b5ac7394d66c9f50d10cdf9b6ae3b167"},"schema_version":"1.0","source":{"id":"1405.3019","kind":"arxiv","version":1}},"canonical_sha256":"68cbfa12d34d6a2fb88a8efed04a4982992309e254fa734fe97d26f45ceee498","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"68cbfa12d34d6a2fb88a8efed04a4982992309e254fa734fe97d26f45ceee498","first_computed_at":"2026-05-18T02:46:15.811899Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:46:15.811899Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"boMChSNNE3cUg3GcKFfqiHOzsWxx6i/1NVcNU7Puow/zuG8CxmPo2BOb2rUweD+KY32f0+yTufXcSOzg1EbZBA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:46:15.812434Z","signed_message":"canonical_sha256_bytes"},"source_id":"1405.3019","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:aa4fd94ffa66a2c9c6d880fe26d48255898302029fea17c4de55e51a51effcff","sha256:9c5e31a16b17275148ad06570a907689ed14685f9c21cbe6518dc67b48ad0923"],"state_sha256":"f8b0b2a0dce7cf882a0845406bf69475065601197a335363ae29fbf653ffeec5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pzVdCDg+48o3IVY8ejHoY96mHoksPsjyJ2CCPk7Wur1U1lM6NHlRbTj6BEn3dTLWAOdtjVDtaTYE6US+uJJDCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T12:58:10.180443Z","bundle_sha256":"2f15c8743b862aff80f32a004883620b8de747c72951fd16cff8ef57bba2fc1f"}}