{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2001:BWPYZRGIOQSCGP6RAOLN5GNXOS","short_pith_number":"pith:BWPYZRGI","canonical_record":{"source":{"id":"hep-ph/0102278","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"hep-ph","submitted_at":"2001-02-22T17:27:38Z","cross_cats_sorted":[],"title_canon_sha256":"621a046e4c92c7c40a6d2a79f41c566f78cfbf69034b8aad02cfe91d253ae594","abstract_canon_sha256":"89234a9055b49a56909225984ec3fbb156a8a1c3507ee24730c36886e9f9c129"},"schema_version":"1.0"},"canonical_sha256":"0d9f8cc4c87424233fd10396de99b7748bdfaff817139249d61ccdc374774ced","source":{"kind":"arxiv","id":"hep-ph/0102278","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-ph/0102278","created_at":"2026-07-04T16:27:15Z"},{"alias_kind":"arxiv_version","alias_value":"hep-ph/0102278v2","created_at":"2026-07-04T16:27:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-ph/0102278","created_at":"2026-07-04T16:27:15Z"},{"alias_kind":"pith_short_12","alias_value":"BWPYZRGIOQSC","created_at":"2026-07-04T16:27:15Z"},{"alias_kind":"pith_short_16","alias_value":"BWPYZRGIOQSCGP6R","created_at":"2026-07-04T16:27:15Z"},{"alias_kind":"pith_short_8","alias_value":"BWPYZRGI","created_at":"2026-07-04T16:27:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2001:BWPYZRGIOQSCGP6RAOLN5GNXOS","target":"record","payload":{"canonical_record":{"source":{"id":"hep-ph/0102278","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"hep-ph","submitted_at":"2001-02-22T17:27:38Z","cross_cats_sorted":[],"title_canon_sha256":"621a046e4c92c7c40a6d2a79f41c566f78cfbf69034b8aad02cfe91d253ae594","abstract_canon_sha256":"89234a9055b49a56909225984ec3fbb156a8a1c3507ee24730c36886e9f9c129"},"schema_version":"1.0"},"canonical_sha256":"0d9f8cc4c87424233fd10396de99b7748bdfaff817139249d61ccdc374774ced","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:27:15.068672Z","signature_b64":"M0k87koR+iIKdy7vz3oz/m74SY6zk6PFCOBvLZJwFlf6JQBvrvxIBSJaAQ8vz7hgKEktOsilxu+ugNGnbjmBBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0d9f8cc4c87424233fd10396de99b7748bdfaff817139249d61ccdc374774ced","last_reissued_at":"2026-07-04T16:27:15.068323Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:27:15.068323Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"hep-ph/0102278","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":"2026-07-04T16:27:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IyV+upKmL+QYuLzjNBR80sFoGwlhvY+C9+NyGR0khPzW2ephpUoYCMNHAKqF+bh9d2WxGRZO4W+q1JaXSgwcDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-22T05:51:23.774783Z"},"content_sha256":"1b49c5908c88362f8567bb2121da846715460aad11a2b38fb030c039e58ab779","schema_version":"1.0","event_id":"sha256:1b49c5908c88362f8567bb2121da846715460aad11a2b38fb030c039e58ab779"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2001:BWPYZRGIOQSCGP6RAOLN5GNXOS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Collins function: a simple model calculation","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"A. Bacchetta, A. Metz, P.J. Mulders (Vrije Universiteit Amsterdam), R. Kundu","submitted_at":"2001-02-22T17:27:38Z","abstract_excerpt":"The Collins function belongs to the class of the so-called time-reversal odd fragmentation functions. Being chiral-odd as well, it can serve as an important tool to observe the nucleon's transversity distribution in semi-inclusive DIS. Due to the possible presence of final state interactions, this function can be non-zero, though this has never been demonstrated in an explicit model calculation. We use a simple pseudoscalar coupling between pions and quarks to model the fragmentation process and we show that the inclusion of one-loop corrections generates a non-vanishing Collins function, ther"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0102278","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/hep-ph/0102278/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":"2026-07-04T16:27:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sivDrLssxrekofk8cjs7yD6Fsw+RwVWLPIKSgE//2MjcZg9xCukZHLXuig1j6n3X3y0kJ18CUIBsY05l8iKwBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-22T05:51:23.775158Z"},"content_sha256":"252ddb69e2f4d1f4b21385ea822a0ade3f9365dd94ac413ab8061a8e56c9c473","schema_version":"1.0","event_id":"sha256:252ddb69e2f4d1f4b21385ea822a0ade3f9365dd94ac413ab8061a8e56c9c473"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BWPYZRGIOQSCGP6RAOLN5GNXOS/bundle.json","state_url":"https://pith.science/pith/BWPYZRGIOQSCGP6RAOLN5GNXOS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BWPYZRGIOQSCGP6RAOLN5GNXOS/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":"2026-07-22T05:51:23Z","links":{"resolver":"https://pith.science/pith/BWPYZRGIOQSCGP6RAOLN5GNXOS","bundle":"https://pith.science/pith/BWPYZRGIOQSCGP6RAOLN5GNXOS/bundle.json","state":"https://pith.science/pith/BWPYZRGIOQSCGP6RAOLN5GNXOS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BWPYZRGIOQSCGP6RAOLN5GNXOS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2001:BWPYZRGIOQSCGP6RAOLN5GNXOS","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":"89234a9055b49a56909225984ec3fbb156a8a1c3507ee24730c36886e9f9c129","cross_cats_sorted":[],"license":"","primary_cat":"hep-ph","submitted_at":"2001-02-22T17:27:38Z","title_canon_sha256":"621a046e4c92c7c40a6d2a79f41c566f78cfbf69034b8aad02cfe91d253ae594"},"schema_version":"1.0","source":{"id":"hep-ph/0102278","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-ph/0102278","created_at":"2026-07-04T16:27:15Z"},{"alias_kind":"arxiv_version","alias_value":"hep-ph/0102278v2","created_at":"2026-07-04T16:27:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-ph/0102278","created_at":"2026-07-04T16:27:15Z"},{"alias_kind":"pith_short_12","alias_value":"BWPYZRGIOQSC","created_at":"2026-07-04T16:27:15Z"},{"alias_kind":"pith_short_16","alias_value":"BWPYZRGIOQSCGP6R","created_at":"2026-07-04T16:27:15Z"},{"alias_kind":"pith_short_8","alias_value":"BWPYZRGI","created_at":"2026-07-04T16:27:15Z"}],"graph_snapshots":[{"event_id":"sha256:252ddb69e2f4d1f4b21385ea822a0ade3f9365dd94ac413ab8061a8e56c9c473","target":"graph","created_at":"2026-07-04T16:27:15Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/hep-ph/0102278/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The Collins function belongs to the class of the so-called time-reversal odd fragmentation functions. Being chiral-odd as well, it can serve as an important tool to observe the nucleon's transversity distribution in semi-inclusive DIS. Due to the possible presence of final state interactions, this function can be non-zero, though this has never been demonstrated in an explicit model calculation. We use a simple pseudoscalar coupling between pions and quarks to model the fragmentation process and we show that the inclusion of one-loop corrections generates a non-vanishing Collins function, ther","authors_text":"A. Bacchetta, A. Metz, P.J. Mulders (Vrije Universiteit Amsterdam), R. Kundu","cross_cats":[],"headline":"","license":"","primary_cat":"hep-ph","submitted_at":"2001-02-22T17:27:38Z","title":"The Collins function: a simple model calculation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0102278","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":"sha256:1b49c5908c88362f8567bb2121da846715460aad11a2b38fb030c039e58ab779","target":"record","created_at":"2026-07-04T16:27:15Z","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":"89234a9055b49a56909225984ec3fbb156a8a1c3507ee24730c36886e9f9c129","cross_cats_sorted":[],"license":"","primary_cat":"hep-ph","submitted_at":"2001-02-22T17:27:38Z","title_canon_sha256":"621a046e4c92c7c40a6d2a79f41c566f78cfbf69034b8aad02cfe91d253ae594"},"schema_version":"1.0","source":{"id":"hep-ph/0102278","kind":"arxiv","version":2}},"canonical_sha256":"0d9f8cc4c87424233fd10396de99b7748bdfaff817139249d61ccdc374774ced","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0d9f8cc4c87424233fd10396de99b7748bdfaff817139249d61ccdc374774ced","first_computed_at":"2026-07-04T16:27:15.068323Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:27:15.068323Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"M0k87koR+iIKdy7vz3oz/m74SY6zk6PFCOBvLZJwFlf6JQBvrvxIBSJaAQ8vz7hgKEktOsilxu+ugNGnbjmBBw==","signature_status":"signed_v1","signed_at":"2026-07-04T16:27:15.068672Z","signed_message":"canonical_sha256_bytes"},"source_id":"hep-ph/0102278","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1b49c5908c88362f8567bb2121da846715460aad11a2b38fb030c039e58ab779","sha256:252ddb69e2f4d1f4b21385ea822a0ade3f9365dd94ac413ab8061a8e56c9c473"],"state_sha256":"191015643d6d2bed498178af2597c0a4bcc321b8e452a84c1d450e3f98686567"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DrbRAfKR0uGa9XotvadZpJdRX+KR8OOVrlGyTNjm4bYmezNU5RmB00Z38bnb8QcGw+FmB63K6NKkrNwU2A1fAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-22T05:51:23.778068Z","bundle_sha256":"ce1913382786c48491be71848d297272d441cf58dfb4093c50c7353cbdaa6040"}}