{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2020:SYMUPU4XZFVWF6ADH2Y6AU6ZBS","short_pith_number":"pith:SYMUPU4X","schema_version":"1.0","canonical_sha256":"961947d397c96b62f8033eb1e053d90ca365ae7c54c3682caa7a3de7b71f0ef2","source":{"kind":"arxiv","id":"2001.07722","version":2},"attestation_state":"computed","paper":{"title":"Parton Distributions in Nucleons and Nuclei","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Emanuele R. Nocera, Jacob J. Ethier","submitted_at":"2020-01-21T19:00:03Z","abstract_excerpt":"We review the current status of Parton Distribution Function (PDF) determinations for unpolarized and longitudinally polarized protons and for unpolarized nuclei, which are probed by high-energy hadronic scattering in perturbative Quantum Chromodynamics (QCD). We present the established theoretical framework, the experimental information, and the methodological aspects inherent to any modern PDF extraction. Furthermore, we summarize the present knowledge of PDFs and discuss their limitations in both accuracy and precision relevant to advance our understanding of QCD proton substructure and pur"},"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":"2001.07722","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2020-01-21T19:00:03Z","cross_cats_sorted":["hep-ex"],"title_canon_sha256":"06cc5fb4999ba60a6ff95b0badef6d43a601e84945c0b7e30b19b9bf99999586","abstract_canon_sha256":"af24a9b9cd14831655129b8ad3a290681414f1e5980df6444e1fe82022ced74d"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:41:02.850937Z","signature_b64":"V+jldtx/gXkPtKl5zCuhsrUGvIuD9ds/eGeNmAYMgmTboxR4/JOFAAHE53zwtoTFeDHjbSFFqR8S9BtNsn5qDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"961947d397c96b62f8033eb1e053d90ca365ae7c54c3682caa7a3de7b71f0ef2","last_reissued_at":"2026-07-05T00:41:02.850472Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:41:02.850472Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Parton Distributions in Nucleons and Nuclei","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Emanuele R. Nocera, Jacob J. Ethier","submitted_at":"2020-01-21T19:00:03Z","abstract_excerpt":"We review the current status of Parton Distribution Function (PDF) determinations for unpolarized and longitudinally polarized protons and for unpolarized nuclei, which are probed by high-energy hadronic scattering in perturbative Quantum Chromodynamics (QCD). We present the established theoretical framework, the experimental information, and the methodological aspects inherent to any modern PDF extraction. Furthermore, we summarize the present knowledge of PDFs and discuss their limitations in both accuracy and precision relevant to advance our understanding of QCD proton substructure and pur"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2001.07722","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2001.07722/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2001.07722","created_at":"2026-07-05T00:41:02.850535+00:00"},{"alias_kind":"arxiv_version","alias_value":"2001.07722v2","created_at":"2026-07-05T00:41:02.850535+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2001.07722","created_at":"2026-07-05T00:41:02.850535+00:00"},{"alias_kind":"pith_short_12","alias_value":"SYMUPU4XZFVW","created_at":"2026-07-05T00:41:02.850535+00:00"},{"alias_kind":"pith_short_16","alias_value":"SYMUPU4XZFVWF6AD","created_at":"2026-07-05T00:41:02.850535+00:00"},{"alias_kind":"pith_short_8","alias_value":"SYMUPU4X","created_at":"2026-07-05T00:41:02.850535+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":7,"internal_anchor_count":0,"sample":[{"citing_arxiv_id":"2606.10206","citing_title":"Charm quark production in heavy-ion collisions as a signature of pre-equilibrium","ref_index":35,"is_internal_anchor":false},{"citing_arxiv_id":"2606.06383","citing_title":"Probing SU(2) Quark Flavor Asymmetry with W Bosons at RHIC","ref_index":19,"is_internal_anchor":false},{"citing_arxiv_id":"1912.02303","citing_title":"Analytical solution to DGLAP integro-differential equation via complex maps in domains of contour integrals","ref_index":32,"is_internal_anchor":false},{"citing_arxiv_id":"2504.02638","citing_title":"Characterization of nuclear breakup as a function of hard-scattering kinematics using dijets measured by ATLAS in $p$+Pb collisions","ref_index":4,"is_internal_anchor":false},{"citing_arxiv_id":"2103.05419","citing_title":"Science Requirements and Detector Concepts for the Electron-Ion Collider: EIC Yellow Report","ref_index":55,"is_internal_anchor":false},{"citing_arxiv_id":"2605.02808","citing_title":"Third moments of nucleon unpolarized, polarized, and transversity parton distribution functions from physical-point lattice QCD","ref_index":10,"is_internal_anchor":false},{"citing_arxiv_id":"2604.11574","citing_title":"SemiCharmTag: a tool for Semileptonic Charm tagging","ref_index":1,"is_internal_anchor":false}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/SYMUPU4XZFVWF6ADH2Y6AU6ZBS","json":"https://pith.science/pith/SYMUPU4XZFVWF6ADH2Y6AU6ZBS.json","graph_json":"https://pith.science/api/pith-number/SYMUPU4XZFVWF6ADH2Y6AU6ZBS/graph.json","events_json":"https://pith.science/api/pith-number/SYMUPU4XZFVWF6ADH2Y6AU6ZBS/events.json","paper":"https://pith.science/paper/SYMUPU4X"},"agent_actions":{"view_html":"https://pith.science/pith/SYMUPU4XZFVWF6ADH2Y6AU6ZBS","download_json":"https://pith.science/pith/SYMUPU4XZFVWF6ADH2Y6AU6ZBS.json","view_paper":"https://pith.science/paper/SYMUPU4X","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2001.07722&json=true","fetch_graph":"https://pith.science/api/pith-number/SYMUPU4XZFVWF6ADH2Y6AU6ZBS/graph.json","fetch_events":"https://pith.science/api/pith-number/SYMUPU4XZFVWF6ADH2Y6AU6ZBS/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/SYMUPU4XZFVWF6ADH2Y6AU6ZBS/action/timestamp_anchor","attest_storage":"https://pith.science/pith/SYMUPU4XZFVWF6ADH2Y6AU6ZBS/action/storage_attestation","attest_author":"https://pith.science/pith/SYMUPU4XZFVWF6ADH2Y6AU6ZBS/action/author_attestation","sign_citation":"https://pith.science/pith/SYMUPU4XZFVWF6ADH2Y6AU6ZBS/action/citation_signature","submit_replication":"https://pith.science/pith/SYMUPU4XZFVWF6ADH2Y6AU6ZBS/action/replication_record"}},"created_at":"2026-07-05T00:41:02.850535+00:00","updated_at":"2026-07-05T00:41:02.850535+00:00"}