{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:YQGI3M4UYM3QK24UU7MMNM4VVP","short_pith_number":"pith:YQGI3M4U","canonical_record":{"source":{"id":"0901.2757","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2009-01-19T01:37:33Z","cross_cats_sorted":[],"title_canon_sha256":"dafe83875f6b421c6c49fa01d4cb8f3965ea13bb09ef4536182d3400ab1ac4f6","abstract_canon_sha256":"70655c39f683e78f993edd308633c48dd34c0660b648e6e37f6d8845b7d03874"},"schema_version":"1.0"},"canonical_sha256":"c40c8db394c337056b94a7d8c6b395abf4e4245a419eb5c253a3cdd41eed6da3","source":{"kind":"arxiv","id":"0901.2757","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0901.2757","created_at":"2026-05-18T02:35:06Z"},{"alias_kind":"arxiv_version","alias_value":"0901.2757v2","created_at":"2026-05-18T02:35:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0901.2757","created_at":"2026-05-18T02:35:06Z"},{"alias_kind":"pith_short_12","alias_value":"YQGI3M4UYM3Q","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"YQGI3M4UYM3QK24U","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"YQGI3M4U","created_at":"2026-05-18T12:26:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:YQGI3M4UYM3QK24UU7MMNM4VVP","target":"record","payload":{"canonical_record":{"source":{"id":"0901.2757","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2009-01-19T01:37:33Z","cross_cats_sorted":[],"title_canon_sha256":"dafe83875f6b421c6c49fa01d4cb8f3965ea13bb09ef4536182d3400ab1ac4f6","abstract_canon_sha256":"70655c39f683e78f993edd308633c48dd34c0660b648e6e37f6d8845b7d03874"},"schema_version":"1.0"},"canonical_sha256":"c40c8db394c337056b94a7d8c6b395abf4e4245a419eb5c253a3cdd41eed6da3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:35:06.410706Z","signature_b64":"0NkOJserfixj/QwrMOUmg1M1MshcfvXuIPNFKBLN9yGJhCOQeoWKdNgNRLmZ0X3yWc7x86edNpgIAF7WhuCUDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c40c8db394c337056b94a7d8c6b395abf4e4245a419eb5c253a3cdd41eed6da3","last_reissued_at":"2026-05-18T02:35:06.410261Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:35:06.410261Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0901.2757","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":"2026-05-18T02:35:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1r2xKeLuMJgjAz1u80HFb2zQ48zK595SPwN4zqpnCPeY54jD3LjTsrSfDsiRWtXeAWXYjEnFIuwg5dyTpAp7DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T21:07:11.081881Z"},"content_sha256":"86334ee50a0e452a7001514b15aa6162f6edf4b9a09f6880454291a4382a810b","schema_version":"1.0","event_id":"sha256:86334ee50a0e452a7001514b15aa6162f6edf4b9a09f6880454291a4382a810b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:YQGI3M4UYM3QK24UU7MMNM4VVP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"J/psi Transverse Momentum Distribution in High Energy Nuclear Collisions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-th","authors_text":"Nu Xu, Pengfei Zhuang, Yunpeng Liu, Zhen Qu","submitted_at":"2009-01-19T01:37:33Z","abstract_excerpt":"The transverse momentum (pt) dependence of J/psi production in heavy ion collisions is investigated in a transport model with both initial production and continuous regeneration of charmonia. The competition between the two production mechanisms results in a pt suppression in central collisions, the gluon multi-scattering in the initial stage leads to a high pt enhancement, and the regeneration populates J/psis at low pt region and induces a minimum in R_AA(pt). These three phenomena are indeed observed in both 200 GeV Cu+Cu and Au+Au collisions at RHIC energy."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0901.2757","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":""},"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":"2026-05-18T02:35:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1/jhfO9gXynTf1tnXLaT237i9Evwk3Z+iy83ZRKvc/Kg0/7yYy3k3oco+SvKympsuEV2MeeqnrPPA+EtrO5pCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T21:07:11.082230Z"},"content_sha256":"0d4d2cf8e43c261760dd17c15e2961a3712462ebfd180c1c2da4ecd7e1822d24","schema_version":"1.0","event_id":"sha256:0d4d2cf8e43c261760dd17c15e2961a3712462ebfd180c1c2da4ecd7e1822d24"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YQGI3M4UYM3QK24UU7MMNM4VVP/bundle.json","state_url":"https://pith.science/pith/YQGI3M4UYM3QK24UU7MMNM4VVP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YQGI3M4UYM3QK24UU7MMNM4VVP/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":"2026-06-02T21:07:11Z","links":{"resolver":"https://pith.science/pith/YQGI3M4UYM3QK24UU7MMNM4VVP","bundle":"https://pith.science/pith/YQGI3M4UYM3QK24UU7MMNM4VVP/bundle.json","state":"https://pith.science/pith/YQGI3M4UYM3QK24UU7MMNM4VVP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YQGI3M4UYM3QK24UU7MMNM4VVP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:YQGI3M4UYM3QK24UU7MMNM4VVP","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":"70655c39f683e78f993edd308633c48dd34c0660b648e6e37f6d8845b7d03874","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2009-01-19T01:37:33Z","title_canon_sha256":"dafe83875f6b421c6c49fa01d4cb8f3965ea13bb09ef4536182d3400ab1ac4f6"},"schema_version":"1.0","source":{"id":"0901.2757","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0901.2757","created_at":"2026-05-18T02:35:06Z"},{"alias_kind":"arxiv_version","alias_value":"0901.2757v2","created_at":"2026-05-18T02:35:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0901.2757","created_at":"2026-05-18T02:35:06Z"},{"alias_kind":"pith_short_12","alias_value":"YQGI3M4UYM3Q","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"YQGI3M4UYM3QK24U","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"YQGI3M4U","created_at":"2026-05-18T12:26:02Z"}],"graph_snapshots":[{"event_id":"sha256:0d4d2cf8e43c261760dd17c15e2961a3712462ebfd180c1c2da4ecd7e1822d24","target":"graph","created_at":"2026-05-18T02:35:06Z","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 transverse momentum (pt) dependence of J/psi production in heavy ion collisions is investigated in a transport model with both initial production and continuous regeneration of charmonia. The competition between the two production mechanisms results in a pt suppression in central collisions, the gluon multi-scattering in the initial stage leads to a high pt enhancement, and the regeneration populates J/psis at low pt region and induces a minimum in R_AA(pt). These three phenomena are indeed observed in both 200 GeV Cu+Cu and Au+Au collisions at RHIC energy.","authors_text":"Nu Xu, Pengfei Zhuang, Yunpeng Liu, Zhen Qu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2009-01-19T01:37:33Z","title":"J/psi Transverse Momentum Distribution in High Energy Nuclear Collisions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0901.2757","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":"sha256:86334ee50a0e452a7001514b15aa6162f6edf4b9a09f6880454291a4382a810b","target":"record","created_at":"2026-05-18T02:35:06Z","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":"70655c39f683e78f993edd308633c48dd34c0660b648e6e37f6d8845b7d03874","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2009-01-19T01:37:33Z","title_canon_sha256":"dafe83875f6b421c6c49fa01d4cb8f3965ea13bb09ef4536182d3400ab1ac4f6"},"schema_version":"1.0","source":{"id":"0901.2757","kind":"arxiv","version":2}},"canonical_sha256":"c40c8db394c337056b94a7d8c6b395abf4e4245a419eb5c253a3cdd41eed6da3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c40c8db394c337056b94a7d8c6b395abf4e4245a419eb5c253a3cdd41eed6da3","first_computed_at":"2026-05-18T02:35:06.410261Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:35:06.410261Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0NkOJserfixj/QwrMOUmg1M1MshcfvXuIPNFKBLN9yGJhCOQeoWKdNgNRLmZ0X3yWc7x86edNpgIAF7WhuCUDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:35:06.410706Z","signed_message":"canonical_sha256_bytes"},"source_id":"0901.2757","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:86334ee50a0e452a7001514b15aa6162f6edf4b9a09f6880454291a4382a810b","sha256:0d4d2cf8e43c261760dd17c15e2961a3712462ebfd180c1c2da4ecd7e1822d24"],"state_sha256":"2e670aa5e7f400e6776d40e01298262732417615f4b7fcd0bae42133e9ceb303"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DvTIPjUjrB2ww4g7egauaO+5crvHQA0gQnXeNMHm1FWNO9X7+o5wYchfUN/qtr8qS2GJZOuwpFzNghNzBngrAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T21:07:11.084254Z","bundle_sha256":"c25855ad965b3fc5eb1cd250436544d28d106ab77528cf9411b77f285ff14def"}}