{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2011:4UL2J7RLGZHCNQUZ6GI7A42FLD","short_pith_number":"pith:4UL2J7RL","schema_version":"1.0","canonical_sha256":"e517a4fe2b364e26c299f191f0734558f8a50a50136c29605dbdd22c671cf5b7","source":{"kind":"arxiv","id":"1102.3479","version":2},"attestation_state":"computed","paper":{"title":"Recent progress on nuclear parton distribution functions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex","nucl-ex","nucl-th"],"primary_cat":"hep-ph","authors_text":"K. Saito, M. Hirai, S. Kumano","submitted_at":"2011-02-17T02:56:14Z","abstract_excerpt":"We report current status of global analyses on nuclear parton distribution functions (NPDFs). The optimum NPDFs are determined by analyzing high-energy nuclear reaction data. Due to limited experimental measurements, antiquark modifications have large uncertainties at x>0.2 and gluon modifications cannot be determined. A nuclear modification difference between u and d quark distributions could be an origin of the long-standing NuTeV sin^2 theta_w anomaly. There is also an issue of nuclear modification differences between the structure functions of charged-lepton and neutrino reactions. Next, n"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1102.3479","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2011-02-17T02:56:14Z","cross_cats_sorted":["hep-ex","nucl-ex","nucl-th"],"title_canon_sha256":"c326a9e7eea28b973b4cbd8918a0e71612ba884c97d3b390ba9c0381295c7dd3","abstract_canon_sha256":"1305b97cdc6c2c94e790c9a6bf53b9ba1795b515f33d73b7234ac02687a94c7d"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:03:10.104044Z","signature_b64":"TfvnPnSYg7jk+ye5tukokFazhyI46tVLIqZqaBcFtJJegV+aftarV3LYc63p1p8Zvqn7fouISltvZyB37Z0MAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e517a4fe2b364e26c299f191f0734558f8a50a50136c29605dbdd22c671cf5b7","last_reissued_at":"2026-05-18T02:03:10.103555Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:03:10.103555Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Recent progress on nuclear parton distribution functions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex","nucl-ex","nucl-th"],"primary_cat":"hep-ph","authors_text":"K. Saito, M. Hirai, S. Kumano","submitted_at":"2011-02-17T02:56:14Z","abstract_excerpt":"We report current status of global analyses on nuclear parton distribution functions (NPDFs). The optimum NPDFs are determined by analyzing high-energy nuclear reaction data. Due to limited experimental measurements, antiquark modifications have large uncertainties at x>0.2 and gluon modifications cannot be determined. A nuclear modification difference between u and d quark distributions could be an origin of the long-standing NuTeV sin^2 theta_w anomaly. There is also an issue of nuclear modification differences between the structure functions of charged-lepton and neutrino reactions. Next, n"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1102.3479","kind":"arxiv","version":2},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1102.3479","created_at":"2026-05-18T02:03:10.103627+00:00"},{"alias_kind":"arxiv_version","alias_value":"1102.3479v2","created_at":"2026-05-18T02:03:10.103627+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1102.3479","created_at":"2026-05-18T02:03:10.103627+00:00"},{"alias_kind":"pith_short_12","alias_value":"4UL2J7RLGZHC","created_at":"2026-05-18T12:26:20.644004+00:00"},{"alias_kind":"pith_short_16","alias_value":"4UL2J7RLGZHCNQUZ","created_at":"2026-05-18T12:26:20.644004+00:00"},{"alias_kind":"pith_short_8","alias_value":"4UL2J7RL","created_at":"2026-05-18T12:26:20.644004+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/4UL2J7RLGZHCNQUZ6GI7A42FLD","json":"https://pith.science/pith/4UL2J7RLGZHCNQUZ6GI7A42FLD.json","graph_json":"https://pith.science/api/pith-number/4UL2J7RLGZHCNQUZ6GI7A42FLD/graph.json","events_json":"https://pith.science/api/pith-number/4UL2J7RLGZHCNQUZ6GI7A42FLD/events.json","paper":"https://pith.science/paper/4UL2J7RL"},"agent_actions":{"view_html":"https://pith.science/pith/4UL2J7RLGZHCNQUZ6GI7A42FLD","download_json":"https://pith.science/pith/4UL2J7RLGZHCNQUZ6GI7A42FLD.json","view_paper":"https://pith.science/paper/4UL2J7RL","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1102.3479&json=true","fetch_graph":"https://pith.science/api/pith-number/4UL2J7RLGZHCNQUZ6GI7A42FLD/graph.json","fetch_events":"https://pith.science/api/pith-number/4UL2J7RLGZHCNQUZ6GI7A42FLD/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/4UL2J7RLGZHCNQUZ6GI7A42FLD/action/timestamp_anchor","attest_storage":"https://pith.science/pith/4UL2J7RLGZHCNQUZ6GI7A42FLD/action/storage_attestation","attest_author":"https://pith.science/pith/4UL2J7RLGZHCNQUZ6GI7A42FLD/action/author_attestation","sign_citation":"https://pith.science/pith/4UL2J7RLGZHCNQUZ6GI7A42FLD/action/citation_signature","submit_replication":"https://pith.science/pith/4UL2J7RLGZHCNQUZ6GI7A42FLD/action/replication_record"}},"created_at":"2026-05-18T02:03:10.103627+00:00","updated_at":"2026-05-18T02:03:10.103627+00:00"}