{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:XRKNCT2XVNB6JRLPDFNZINDOMH","short_pith_number":"pith:XRKNCT2X","canonical_record":{"source":{"id":"2112.12462","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2021-12-23T11:02:33Z","cross_cats_sorted":[],"title_canon_sha256":"878f618636a6eb4ecdf0e56a60fde9e49605b43fc6a6ba6cb995f2e6d530185d","abstract_canon_sha256":"e973fdb7f3f350ad9f6ad56bc90893e46f4388bd1f3279345d19fd0461167050"},"schema_version":"1.0"},"canonical_sha256":"bc54d14f57ab43e4c56f195b94346e61d6b30f71b594bd766a86055b03f9c4d7","source":{"kind":"arxiv","id":"2112.12462","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2112.12462","created_at":"2026-07-05T04:25:51Z"},{"alias_kind":"arxiv_version","alias_value":"2112.12462v2","created_at":"2026-07-05T04:25:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2112.12462","created_at":"2026-07-05T04:25:51Z"},{"alias_kind":"pith_short_12","alias_value":"XRKNCT2XVNB6","created_at":"2026-07-05T04:25:51Z"},{"alias_kind":"pith_short_16","alias_value":"XRKNCT2XVNB6JRLP","created_at":"2026-07-05T04:25:51Z"},{"alias_kind":"pith_short_8","alias_value":"XRKNCT2X","created_at":"2026-07-05T04:25:51Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:XRKNCT2XVNB6JRLPDFNZINDOMH","target":"record","payload":{"canonical_record":{"source":{"id":"2112.12462","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2021-12-23T11:02:33Z","cross_cats_sorted":[],"title_canon_sha256":"878f618636a6eb4ecdf0e56a60fde9e49605b43fc6a6ba6cb995f2e6d530185d","abstract_canon_sha256":"e973fdb7f3f350ad9f6ad56bc90893e46f4388bd1f3279345d19fd0461167050"},"schema_version":"1.0"},"canonical_sha256":"bc54d14f57ab43e4c56f195b94346e61d6b30f71b594bd766a86055b03f9c4d7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:25:51.421656Z","signature_b64":"Dic5mrNedAvNGkcnHc1APGFFtHvcBtllrUb4iLZd8kScqdXvrkCDVwnpZlZLuQT3g58p33m0Lm0076AIZu2iDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bc54d14f57ab43e4c56f195b94346e61d6b30f71b594bd766a86055b03f9c4d7","last_reissued_at":"2026-07-05T04:25:51.421210Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:25:51.421210Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2112.12462","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T04:25:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sVnty5kwAo26DC0Mw1EgfsmAdcnE89/ziO74uEZcO/6Ch+mMYvcfujPu0/ckWuglY6uHrcTI0X5nHvE1SF/RAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-25T20:36:48.074997Z"},"content_sha256":"4ba7b70af741f0f0409565ca6077497ebf7e8601a96984fdcb6b3564864f7005","schema_version":"1.0","event_id":"sha256:4ba7b70af741f0f0409565ca6077497ebf7e8601a96984fdcb6b3564864f7005"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:XRKNCT2XVNB6JRLPDFNZINDOMH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"EPPS21: A global QCD analysis of nuclear PDFs","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Carlos A. Salgado, Hannu Paukkunen, Kari J. Eskola, Petja Paakkinen","submitted_at":"2021-12-23T11:02:33Z","abstract_excerpt":"We present an updated global analysis of collinearly factorized nuclear parton distribution functions (PDFs) at next-to-leading order in perturbative QCD. In comparison to our previous fit, EPPS16, the present analysis includes more data from proton-lead collisions at the Large Hadron Collider: 5TeV double-differential CMS dijet and LHCb D-meson data, as well as 8TeV CMS W$^\\pm$ data. These new data lead to significantly better-constrained gluon distributions at small and intermediate values of the momentum fraction $x$, confirming the presence of shadowing and antishadowing for gluons in larg"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2112.12462","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/2112.12462/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T04:25:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tYAHG4W6Fu1M71Xxjmh47YzXE2P1TfFjzqL5jK4a7rdG/FDl9iQWz0esrF+d3pCAyaYviL2kKCL9ganrJv4TBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-25T20:36:48.075392Z"},"content_sha256":"d48971052d02a161418e4f43020d02034a8a0d0ca0c0318d56d9851cd1c4b34b","schema_version":"1.0","event_id":"sha256:d48971052d02a161418e4f43020d02034a8a0d0ca0c0318d56d9851cd1c4b34b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XRKNCT2XVNB6JRLPDFNZINDOMH/bundle.json","state_url":"https://pith.science/pith/XRKNCT2XVNB6JRLPDFNZINDOMH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XRKNCT2XVNB6JRLPDFNZINDOMH/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":"2026-07-25T20:36:48Z","links":{"resolver":"https://pith.science/pith/XRKNCT2XVNB6JRLPDFNZINDOMH","bundle":"https://pith.science/pith/XRKNCT2XVNB6JRLPDFNZINDOMH/bundle.json","state":"https://pith.science/pith/XRKNCT2XVNB6JRLPDFNZINDOMH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XRKNCT2XVNB6JRLPDFNZINDOMH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:XRKNCT2XVNB6JRLPDFNZINDOMH","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":"e973fdb7f3f350ad9f6ad56bc90893e46f4388bd1f3279345d19fd0461167050","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2021-12-23T11:02:33Z","title_canon_sha256":"878f618636a6eb4ecdf0e56a60fde9e49605b43fc6a6ba6cb995f2e6d530185d"},"schema_version":"1.0","source":{"id":"2112.12462","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2112.12462","created_at":"2026-07-05T04:25:51Z"},{"alias_kind":"arxiv_version","alias_value":"2112.12462v2","created_at":"2026-07-05T04:25:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2112.12462","created_at":"2026-07-05T04:25:51Z"},{"alias_kind":"pith_short_12","alias_value":"XRKNCT2XVNB6","created_at":"2026-07-05T04:25:51Z"},{"alias_kind":"pith_short_16","alias_value":"XRKNCT2XVNB6JRLP","created_at":"2026-07-05T04:25:51Z"},{"alias_kind":"pith_short_8","alias_value":"XRKNCT2X","created_at":"2026-07-05T04:25:51Z"}],"graph_snapshots":[{"event_id":"sha256:d48971052d02a161418e4f43020d02034a8a0d0ca0c0318d56d9851cd1c4b34b","target":"graph","created_at":"2026-07-05T04:25:51Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2112.12462/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present an updated global analysis of collinearly factorized nuclear parton distribution functions (PDFs) at next-to-leading order in perturbative QCD. In comparison to our previous fit, EPPS16, the present analysis includes more data from proton-lead collisions at the Large Hadron Collider: 5TeV double-differential CMS dijet and LHCb D-meson data, as well as 8TeV CMS W$^\\pm$ data. These new data lead to significantly better-constrained gluon distributions at small and intermediate values of the momentum fraction $x$, confirming the presence of shadowing and antishadowing for gluons in larg","authors_text":"Carlos A. Salgado, Hannu Paukkunen, Kari J. Eskola, Petja Paakkinen","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2021-12-23T11:02:33Z","title":"EPPS21: A global QCD analysis of nuclear PDFs"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2112.12462","kind":"arxiv","version":2},"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":"sha256:4ba7b70af741f0f0409565ca6077497ebf7e8601a96984fdcb6b3564864f7005","target":"record","created_at":"2026-07-05T04:25:51Z","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":"e973fdb7f3f350ad9f6ad56bc90893e46f4388bd1f3279345d19fd0461167050","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2021-12-23T11:02:33Z","title_canon_sha256":"878f618636a6eb4ecdf0e56a60fde9e49605b43fc6a6ba6cb995f2e6d530185d"},"schema_version":"1.0","source":{"id":"2112.12462","kind":"arxiv","version":2}},"canonical_sha256":"bc54d14f57ab43e4c56f195b94346e61d6b30f71b594bd766a86055b03f9c4d7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bc54d14f57ab43e4c56f195b94346e61d6b30f71b594bd766a86055b03f9c4d7","first_computed_at":"2026-07-05T04:25:51.421210Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:25:51.421210Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Dic5mrNedAvNGkcnHc1APGFFtHvcBtllrUb4iLZd8kScqdXvrkCDVwnpZlZLuQT3g58p33m0Lm0076AIZu2iDA==","signature_status":"signed_v1","signed_at":"2026-07-05T04:25:51.421656Z","signed_message":"canonical_sha256_bytes"},"source_id":"2112.12462","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4ba7b70af741f0f0409565ca6077497ebf7e8601a96984fdcb6b3564864f7005","sha256:d48971052d02a161418e4f43020d02034a8a0d0ca0c0318d56d9851cd1c4b34b"],"state_sha256":"18170e8d6385c2fe7d6f8a511d3dab7b95ec3105518ad8408ccb030c9ece9bbc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iUBqZXTy8eIUhF7Xq84PGTvu0oAfbTOLvFIQvDIercPZ2O5r9ZCPM4PQ0bfZThTkPkg+8fG6dIyq/aCUFqH+BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-25T20:36:48.077939Z","bundle_sha256":"5b738a6b0c750db6f5c2c0c40c5d468524d47b1df9aecb00907abcf3dff278ec"}}