{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:X2ZWSUHYRWVOM2LQRZ64QBGRMG","short_pith_number":"pith:X2ZWSUHY","canonical_record":{"source":{"id":"2002.02902","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2020-02-07T16:59:29Z","cross_cats_sorted":[],"title_canon_sha256":"d0fc1c6c6f8f2448761d350b8557c426ec8de35b0568d68c40145b12ac57991e","abstract_canon_sha256":"a28dd9c6c318635d614965255add8e1719842d3860ed5795539a9256dddaabc2"},"schema_version":"1.0"},"canonical_sha256":"beb36950f88daae669708e7dc804d161a275bc0b37e5b1605cc6c77d150913c9","source":{"kind":"arxiv","id":"2002.02902","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2002.02902","created_at":"2026-07-05T01:26:50Z"},{"alias_kind":"arxiv_version","alias_value":"2002.02902v2","created_at":"2026-07-05T01:26:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2002.02902","created_at":"2026-07-05T01:26:50Z"},{"alias_kind":"pith_short_12","alias_value":"X2ZWSUHYRWVO","created_at":"2026-07-05T01:26:50Z"},{"alias_kind":"pith_short_16","alias_value":"X2ZWSUHYRWVOM2LQ","created_at":"2026-07-05T01:26:50Z"},{"alias_kind":"pith_short_8","alias_value":"X2ZWSUHY","created_at":"2026-07-05T01:26:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:X2ZWSUHYRWVOM2LQRZ64QBGRMG","target":"record","payload":{"canonical_record":{"source":{"id":"2002.02902","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2020-02-07T16:59:29Z","cross_cats_sorted":[],"title_canon_sha256":"d0fc1c6c6f8f2448761d350b8557c426ec8de35b0568d68c40145b12ac57991e","abstract_canon_sha256":"a28dd9c6c318635d614965255add8e1719842d3860ed5795539a9256dddaabc2"},"schema_version":"1.0"},"canonical_sha256":"beb36950f88daae669708e7dc804d161a275bc0b37e5b1605cc6c77d150913c9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:26:50.821452Z","signature_b64":"zELf6zvLh0KVL+Es26UgrlZeAL9uIU1XAi4iS16s2y6yAiILPTzlMzpnwZifC5Um2jt21DXgJU9G91AVaFb9CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"beb36950f88daae669708e7dc804d161a275bc0b37e5b1605cc6c77d150913c9","last_reissued_at":"2026-07-05T01:26:50.820998Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:26:50.820998Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2002.02902","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":"2026-07-05T01:26:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"A1xxbnNOMvM/9PRNMN+9Q9GhodQ0144SXspS0lmI1Kw/E8aSJYH/zRSqRWSMbpv6mIeWgHOAbp/TXIJHX5OGDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T04:52:28.317647Z"},"content_sha256":"cab87f968d0554203876cd3cfc3f12702e9da9c1eaa7421cb4eca4951a8e59ef","schema_version":"1.0","event_id":"sha256:cab87f968d0554203876cd3cfc3f12702e9da9c1eaa7421cb4eca4951a8e59ef"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:X2ZWSUHYRWVOM2LQRZ64QBGRMG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Parton Distribution Functions of the Charged Pion Within The xFitter Framework","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Agnieszka Luszczak, Aleksander Kusina, Alexander Glazov, Amanda Cooper-Sarkar, Daniel Britzger, Francesco Giuli, Fred Olness, Hamed Abdolmaleki, Ivan Novikov, Mark Sutton, Oleksandr Zenaiev, Pavel Starovoitov","submitted_at":"2020-02-07T16:59:29Z","abstract_excerpt":"We present the first open-source analysis of parton distribution functions (PDFs) of charged pions using xFitter, an open-source QCD fit framework to facilitate PDF extraction and analyses. Our calculations are implemented at next-to-leading order (NLO) using APPLgrids generated by MCFM generator. Using currently available Drell-Yan and photon production data, we find the valence distribution is well constrained; however, the considered data are not sensitive enough to unambiguously determine sea and gluon distributions. Fractions of momentum carried by the valence, sea and gluon components ar"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2002.02902","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/2002.02902/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":"2026-07-05T01:26:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oPPmSYQNW+No/PhcbYZGMKgnDuEvIhFxG6kyhJgwPK/dMmQ3HMwSRMKnK8GefcwdI3igoB3rQdwQBlKMP5pUCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T04:52:28.318158Z"},"content_sha256":"bed96d2447ff46dc1caf46d737b0efc72ebd95922556623b608a346bd592ac90","schema_version":"1.0","event_id":"sha256:bed96d2447ff46dc1caf46d737b0efc72ebd95922556623b608a346bd592ac90"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/X2ZWSUHYRWVOM2LQRZ64QBGRMG/bundle.json","state_url":"https://pith.science/pith/X2ZWSUHYRWVOM2LQRZ64QBGRMG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/X2ZWSUHYRWVOM2LQRZ64QBGRMG/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":"2026-08-15T04:52:28Z","links":{"resolver":"https://pith.science/pith/X2ZWSUHYRWVOM2LQRZ64QBGRMG","bundle":"https://pith.science/pith/X2ZWSUHYRWVOM2LQRZ64QBGRMG/bundle.json","state":"https://pith.science/pith/X2ZWSUHYRWVOM2LQRZ64QBGRMG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/X2ZWSUHYRWVOM2LQRZ64QBGRMG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:X2ZWSUHYRWVOM2LQRZ64QBGRMG","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":"a28dd9c6c318635d614965255add8e1719842d3860ed5795539a9256dddaabc2","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2020-02-07T16:59:29Z","title_canon_sha256":"d0fc1c6c6f8f2448761d350b8557c426ec8de35b0568d68c40145b12ac57991e"},"schema_version":"1.0","source":{"id":"2002.02902","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2002.02902","created_at":"2026-07-05T01:26:50Z"},{"alias_kind":"arxiv_version","alias_value":"2002.02902v2","created_at":"2026-07-05T01:26:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2002.02902","created_at":"2026-07-05T01:26:50Z"},{"alias_kind":"pith_short_12","alias_value":"X2ZWSUHYRWVO","created_at":"2026-07-05T01:26:50Z"},{"alias_kind":"pith_short_16","alias_value":"X2ZWSUHYRWVOM2LQ","created_at":"2026-07-05T01:26:50Z"},{"alias_kind":"pith_short_8","alias_value":"X2ZWSUHY","created_at":"2026-07-05T01:26:50Z"}],"graph_snapshots":[{"event_id":"sha256:bed96d2447ff46dc1caf46d737b0efc72ebd95922556623b608a346bd592ac90","target":"graph","created_at":"2026-07-05T01:26:50Z","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/2002.02902/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present the first open-source analysis of parton distribution functions (PDFs) of charged pions using xFitter, an open-source QCD fit framework to facilitate PDF extraction and analyses. Our calculations are implemented at next-to-leading order (NLO) using APPLgrids generated by MCFM generator. Using currently available Drell-Yan and photon production data, we find the valence distribution is well constrained; however, the considered data are not sensitive enough to unambiguously determine sea and gluon distributions. Fractions of momentum carried by the valence, sea and gluon components ar","authors_text":"Agnieszka Luszczak, Aleksander Kusina, Alexander Glazov, Amanda Cooper-Sarkar, Daniel Britzger, Francesco Giuli, Fred Olness, Hamed Abdolmaleki, Ivan Novikov, Mark Sutton, Oleksandr Zenaiev, Pavel Starovoitov","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2020-02-07T16:59:29Z","title":"Parton Distribution Functions of the Charged Pion Within The xFitter Framework"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2002.02902","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:cab87f968d0554203876cd3cfc3f12702e9da9c1eaa7421cb4eca4951a8e59ef","target":"record","created_at":"2026-07-05T01:26:50Z","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":"a28dd9c6c318635d614965255add8e1719842d3860ed5795539a9256dddaabc2","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2020-02-07T16:59:29Z","title_canon_sha256":"d0fc1c6c6f8f2448761d350b8557c426ec8de35b0568d68c40145b12ac57991e"},"schema_version":"1.0","source":{"id":"2002.02902","kind":"arxiv","version":2}},"canonical_sha256":"beb36950f88daae669708e7dc804d161a275bc0b37e5b1605cc6c77d150913c9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"beb36950f88daae669708e7dc804d161a275bc0b37e5b1605cc6c77d150913c9","first_computed_at":"2026-07-05T01:26:50.820998Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:26:50.820998Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zELf6zvLh0KVL+Es26UgrlZeAL9uIU1XAi4iS16s2y6yAiILPTzlMzpnwZifC5Um2jt21DXgJU9G91AVaFb9CA==","signature_status":"signed_v1","signed_at":"2026-07-05T01:26:50.821452Z","signed_message":"canonical_sha256_bytes"},"source_id":"2002.02902","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cab87f968d0554203876cd3cfc3f12702e9da9c1eaa7421cb4eca4951a8e59ef","sha256:bed96d2447ff46dc1caf46d737b0efc72ebd95922556623b608a346bd592ac90"],"state_sha256":"8f601ecadb72eaaa914b41ca1f7bd7f63dcf0f530904418f110b66bef557a82c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FeirM5j7nmUPxGNR2AMAQ4pd+G7YneyAkNBuTemz/NYlIUESHvFcJMhBg/Ks4Wsxjm82PJqPSPd1lJsgv316Ag==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-15T04:52:28.323703Z","bundle_sha256":"6e4dfe9614069fa7e2c1830bc607f43d202e4fd22fd86426a562599405172ce8"}}