{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:R32BK4TBMUQPGQGIJQFFIWVPCT","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":"aedd1da3925a63883710e3267e6319a24cb2d8f345e8e873d67feea7fca85e34","cross_cats_sorted":["hep-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2012-12-29T03:36:34Z","title_canon_sha256":"779810f07d2ec5e8b67539e33d3ced46a94263af5c0e21a1550f30da9005e52e"},"schema_version":"1.0","source":{"id":"1212.6587","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1212.6587","created_at":"2026-05-18T02:56:11Z"},{"alias_kind":"arxiv_version","alias_value":"1212.6587v4","created_at":"2026-05-18T02:56:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1212.6587","created_at":"2026-05-18T02:56:11Z"},{"alias_kind":"pith_short_12","alias_value":"R32BK4TBMUQP","created_at":"2026-05-18T12:27:20Z"},{"alias_kind":"pith_short_16","alias_value":"R32BK4TBMUQPGQGI","created_at":"2026-05-18T12:27:20Z"},{"alias_kind":"pith_short_8","alias_value":"R32BK4TB","created_at":"2026-05-18T12:27:20Z"}],"graph_snapshots":[{"event_id":"sha256:774ebe04f13e3dc76c39f85bf20b50adb2b5d58b01eb1792dcb472883d4f349b","target":"graph","created_at":"2026-05-18T02:56:11Z","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":"We investigated the information carried by the data of direct photons, ie, the transverse momentum spectrum and the elliptic flow $v_{2}$ from Pb+Pb collisions at $\\sqrt{s_{NN}}$=2.76TeV measured at Large Hadron Collider (LHC) and from Au+Au collisions at $\\sqrt{s_{NN}}$= 200 GeV measured at Relativistic Heavy Ion Collider (RHIC), in the frame work of (3+1)-dimensional ideal hydrodynamical models constrained with hadronic data. We found those direct photon data may serve as a useful clock at the early stage of heavy ion collisions. The time scales of reaching thermal and chemical equilibrium, ","authors_text":"Fu-Ming Liu, Sheng-Xu Liu","cross_cats":["hep-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2012-12-29T03:36:34Z","title":"QGP formation time and direct photons from heavy ion collisions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1212.6587","kind":"arxiv","version":4},"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":"sha256:1c2394ba285daae20817d8a9e1b6e778a27d7abc52393ac0590d3215d5ee686d","target":"record","created_at":"2026-05-18T02:56:11Z","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":"aedd1da3925a63883710e3267e6319a24cb2d8f345e8e873d67feea7fca85e34","cross_cats_sorted":["hep-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2012-12-29T03:36:34Z","title_canon_sha256":"779810f07d2ec5e8b67539e33d3ced46a94263af5c0e21a1550f30da9005e52e"},"schema_version":"1.0","source":{"id":"1212.6587","kind":"arxiv","version":4}},"canonical_sha256":"8ef41572616520f340c84c0a545aaf14f9c355a8853bb229a84502c8b4ea51b8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8ef41572616520f340c84c0a545aaf14f9c355a8853bb229a84502c8b4ea51b8","first_computed_at":"2026-05-18T02:56:11.712004Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:56:11.712004Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/qh0oeZeHKteQmbRrwAMavYm5KKQiRAKtmsbwrJMTJP/LLQKRNbI98Qmeow4Tzl1Diac6+KLBJIkbxHlISqXCA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:56:11.712479Z","signed_message":"canonical_sha256_bytes"},"source_id":"1212.6587","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1c2394ba285daae20817d8a9e1b6e778a27d7abc52393ac0590d3215d5ee686d","sha256:774ebe04f13e3dc76c39f85bf20b50adb2b5d58b01eb1792dcb472883d4f349b"],"state_sha256":"3ae5a7c100c9313df16d271de5623e46f559429a46f906c3a578d04a714ea818"}