{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:NMEMVHJGP6AD73WWNWXDH5IZGB","short_pith_number":"pith:NMEMVHJG","canonical_record":{"source":{"id":"1902.04520","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-02-12T17:55:23Z","cross_cats_sorted":[],"title_canon_sha256":"07f8df5698c91b275dbb49dc9219694f2c21b30b5973caffa2e940efac6dae10","abstract_canon_sha256":"85149024d2c3d2ee66e7a753ed7cba5937fc8f84415af51fef45faa8c4030a15"},"schema_version":"1.0"},"canonical_sha256":"6b08ca9d267f803feed66dae33f51930599dbf2a4d03e63cdbaafa755de60f34","source":{"kind":"arxiv","id":"1902.04520","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.04520","created_at":"2026-05-17T23:54:12Z"},{"alias_kind":"arxiv_version","alias_value":"1902.04520v1","created_at":"2026-05-17T23:54:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.04520","created_at":"2026-05-17T23:54:12Z"},{"alias_kind":"pith_short_12","alias_value":"NMEMVHJGP6AD","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_16","alias_value":"NMEMVHJGP6AD73WW","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_8","alias_value":"NMEMVHJG","created_at":"2026-05-18T12:33:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:NMEMVHJGP6AD73WWNWXDH5IZGB","target":"record","payload":{"canonical_record":{"source":{"id":"1902.04520","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-02-12T17:55:23Z","cross_cats_sorted":[],"title_canon_sha256":"07f8df5698c91b275dbb49dc9219694f2c21b30b5973caffa2e940efac6dae10","abstract_canon_sha256":"85149024d2c3d2ee66e7a753ed7cba5937fc8f84415af51fef45faa8c4030a15"},"schema_version":"1.0"},"canonical_sha256":"6b08ca9d267f803feed66dae33f51930599dbf2a4d03e63cdbaafa755de60f34","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:54:12.076217Z","signature_b64":"uyIVg7UlKTHIIvlxlHUw9alpFsaAocKQVlHcm0q1TKLbnS2oJFjGqhuBONq5QJUfLXmg/k77XNJULq8dOXFoDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6b08ca9d267f803feed66dae33f51930599dbf2a4d03e63cdbaafa755de60f34","last_reissued_at":"2026-05-17T23:54:12.075710Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:54:12.075710Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1902.04520","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:54:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VBtyhLiCauHQ3errMewFO12wVymhrKGA8Mv1n+6fQhfB9ImaqCIFKpebN/Hz9aP5woVQzl1o58WVyg39Qau6AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T05:57:13.272539Z"},"content_sha256":"ea43c340b78d6cb5486674be5ad81f94ba714daa0ed57991a392923840e52b3d","schema_version":"1.0","event_id":"sha256:ea43c340b78d6cb5486674be5ad81f94ba714daa0ed57991a392923840e52b3d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:NMEMVHJGP6AD73WWNWXDH5IZGB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Leptoproduction of $\\rho$-mesons as discriminator for the unintegrated gluon distribution in the proton","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Alessandro Papa, Andr\\`ee Dafne Bolognino, Dmitry Yu. Ivanov, Francesco Giovanni Celiberto","submitted_at":"2019-02-12T17:55:23Z","abstract_excerpt":"The gluon content of the proton, in the high-energy regime, is embodied by the unintegrated gluon distribution (UGD), which describes the gluon emission probability, with a given longitudinal momentum fraction and transverse momentum. The UGD, formulated within the $\\kappa$-factorization approach, has universal validity and several models for it have been proposed so far. We will show that the polarized $\\rho$-meson leptoproduction at HERA is a not trivial testfield for discriminating among existing models of UGD."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.04520","kind":"arxiv","version":1},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:54:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xu1xcyjq4xuyrCUpCRE8h/keWmtzMXIx2RqcIztfnTaJzFRNl5MqXGHqbxSYG4ijG846haQU6WRb6V5wq9wPDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T05:57:13.272894Z"},"content_sha256":"1285a2dda2aec55a82fe9647ec135bf0a23e3f0b9c54a98d4093578933902576","schema_version":"1.0","event_id":"sha256:1285a2dda2aec55a82fe9647ec135bf0a23e3f0b9c54a98d4093578933902576"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NMEMVHJGP6AD73WWNWXDH5IZGB/bundle.json","state_url":"https://pith.science/pith/NMEMVHJGP6AD73WWNWXDH5IZGB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NMEMVHJGP6AD73WWNWXDH5IZGB/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":"2026-05-31T05:57:13Z","links":{"resolver":"https://pith.science/pith/NMEMVHJGP6AD73WWNWXDH5IZGB","bundle":"https://pith.science/pith/NMEMVHJGP6AD73WWNWXDH5IZGB/bundle.json","state":"https://pith.science/pith/NMEMVHJGP6AD73WWNWXDH5IZGB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NMEMVHJGP6AD73WWNWXDH5IZGB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:NMEMVHJGP6AD73WWNWXDH5IZGB","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":"85149024d2c3d2ee66e7a753ed7cba5937fc8f84415af51fef45faa8c4030a15","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-02-12T17:55:23Z","title_canon_sha256":"07f8df5698c91b275dbb49dc9219694f2c21b30b5973caffa2e940efac6dae10"},"schema_version":"1.0","source":{"id":"1902.04520","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.04520","created_at":"2026-05-17T23:54:12Z"},{"alias_kind":"arxiv_version","alias_value":"1902.04520v1","created_at":"2026-05-17T23:54:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.04520","created_at":"2026-05-17T23:54:12Z"},{"alias_kind":"pith_short_12","alias_value":"NMEMVHJGP6AD","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_16","alias_value":"NMEMVHJGP6AD73WW","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_8","alias_value":"NMEMVHJG","created_at":"2026-05-18T12:33:24Z"}],"graph_snapshots":[{"event_id":"sha256:1285a2dda2aec55a82fe9647ec135bf0a23e3f0b9c54a98d4093578933902576","target":"graph","created_at":"2026-05-17T23:54:12Z","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"},"paper":{"abstract_excerpt":"The gluon content of the proton, in the high-energy regime, is embodied by the unintegrated gluon distribution (UGD), which describes the gluon emission probability, with a given longitudinal momentum fraction and transverse momentum. The UGD, formulated within the $\\kappa$-factorization approach, has universal validity and several models for it have been proposed so far. We will show that the polarized $\\rho$-meson leptoproduction at HERA is a not trivial testfield for discriminating among existing models of UGD.","authors_text":"Alessandro Papa, Andr\\`ee Dafne Bolognino, Dmitry Yu. Ivanov, Francesco Giovanni Celiberto","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-02-12T17:55:23Z","title":"Leptoproduction of $\\rho$-mesons as discriminator for the unintegrated gluon distribution in the proton"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.04520","kind":"arxiv","version":1},"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:ea43c340b78d6cb5486674be5ad81f94ba714daa0ed57991a392923840e52b3d","target":"record","created_at":"2026-05-17T23:54:12Z","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":"85149024d2c3d2ee66e7a753ed7cba5937fc8f84415af51fef45faa8c4030a15","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-02-12T17:55:23Z","title_canon_sha256":"07f8df5698c91b275dbb49dc9219694f2c21b30b5973caffa2e940efac6dae10"},"schema_version":"1.0","source":{"id":"1902.04520","kind":"arxiv","version":1}},"canonical_sha256":"6b08ca9d267f803feed66dae33f51930599dbf2a4d03e63cdbaafa755de60f34","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6b08ca9d267f803feed66dae33f51930599dbf2a4d03e63cdbaafa755de60f34","first_computed_at":"2026-05-17T23:54:12.075710Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:54:12.075710Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"uyIVg7UlKTHIIvlxlHUw9alpFsaAocKQVlHcm0q1TKLbnS2oJFjGqhuBONq5QJUfLXmg/k77XNJULq8dOXFoDA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:54:12.076217Z","signed_message":"canonical_sha256_bytes"},"source_id":"1902.04520","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ea43c340b78d6cb5486674be5ad81f94ba714daa0ed57991a392923840e52b3d","sha256:1285a2dda2aec55a82fe9647ec135bf0a23e3f0b9c54a98d4093578933902576"],"state_sha256":"2bc61343424f95e633ceaae2feb9d78deb7ddf1e38673d50f16c46d78287f737"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dRLWq6jfkX/LQqpA0QpZbaHor47zcWdvwos/KQFlfa4DVaiLUxhAgpXBDUfKBjaCK9wtmI5EU2WaCAH+L0fGCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T05:57:13.274916Z","bundle_sha256":"7ab14fc56ff40d2949427b6c022fbe434e80fa1bfe1a3e79b47fd36aa56bbef6"}}