{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:ZVZAH2EABP3SH32JJ4O3CABU22","short_pith_number":"pith:ZVZAH2EA","canonical_record":{"source":{"id":"1309.6747","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2013-09-26T07:50:58Z","cross_cats_sorted":[],"title_canon_sha256":"2e2c26531b2defa56854b233d1259b77b44fabb5ac7f0c3c5a367bf0b722c151","abstract_canon_sha256":"df3731c111d4babcfbb43cebe195d74174f853927269b300587781ebea14a796"},"schema_version":"1.0"},"canonical_sha256":"cd7203e8800bf723ef494f1db10034d6a75e5ae5aa72a687f0010008dca93721","source":{"kind":"arxiv","id":"1309.6747","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1309.6747","created_at":"2026-05-18T01:47:26Z"},{"alias_kind":"arxiv_version","alias_value":"1309.6747v1","created_at":"2026-05-18T01:47:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1309.6747","created_at":"2026-05-18T01:47:26Z"},{"alias_kind":"pith_short_12","alias_value":"ZVZAH2EABP3S","created_at":"2026-05-18T12:28:09Z"},{"alias_kind":"pith_short_16","alias_value":"ZVZAH2EABP3SH32J","created_at":"2026-05-18T12:28:09Z"},{"alias_kind":"pith_short_8","alias_value":"ZVZAH2EA","created_at":"2026-05-18T12:28:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:ZVZAH2EABP3SH32JJ4O3CABU22","target":"record","payload":{"canonical_record":{"source":{"id":"1309.6747","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2013-09-26T07:50:58Z","cross_cats_sorted":[],"title_canon_sha256":"2e2c26531b2defa56854b233d1259b77b44fabb5ac7f0c3c5a367bf0b722c151","abstract_canon_sha256":"df3731c111d4babcfbb43cebe195d74174f853927269b300587781ebea14a796"},"schema_version":"1.0"},"canonical_sha256":"cd7203e8800bf723ef494f1db10034d6a75e5ae5aa72a687f0010008dca93721","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:47:26.403597Z","signature_b64":"yb8XmZhSMdO5WOuhQmw8D9bRsXMqF7DDmVX9c66amjEcD34l11OjhSHaq2RRKT8qcEFKDgnDGv2dBzIBosgGDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cd7203e8800bf723ef494f1db10034d6a75e5ae5aa72a687f0010008dca93721","last_reissued_at":"2026-05-18T01:47:26.402949Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:47:26.402949Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1309.6747","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":"2026-05-18T01:47:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MEZKVx9jbpRc3Jgt9L2sketbPc7tObypnekRf6kKViCMrmIiXUATt8B32xCpyrEDv6cVipiP6ppj3jJBJgq+Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T16:57:29.461091Z"},"content_sha256":"2e5888037cba0d3e106e00830084065e85278143b2fdbd1efa5432967aa5ca8e","schema_version":"1.0","event_id":"sha256:2e5888037cba0d3e106e00830084065e85278143b2fdbd1efa5432967aa5ca8e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:ZVZAH2EABP3SH32JJ4O3CABU22","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Challenges for QCD theory - some personal reflections -","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"T. Sj\\\"ostrand","submitted_at":"2013-09-26T07:50:58Z","abstract_excerpt":"At the LHC all processes are QCD ones, whether \"signal\" or \"background\". In this review the frontiers of current QCD research are addressed, towards increased understanding, improved calculational precision, and role in potential future discoveries. Issues raised include the limits of perturbative QCD calculations and parton distribution usage, the nature of multiparton interactions, the impact of colour reconnection on physical observables, the need for progress on hadronization modelling, the improvements of parton showers and their combination with the matrix-element description, the use of"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1309.6747","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":"2026-05-18T01:47:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"D9SeCtVPjBsPXV4pK1Ln8G6bF3hr/d0I9MnWJ2u5eqE1BruJTg8kwRDDAOppmdOBfN8UGCcSSFk6QwdPnqO2AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T16:57:29.461766Z"},"content_sha256":"d74c8b990e0afc66a09b4bcc3e27b17d79ceee662a26a0f562329141e1d4697b","schema_version":"1.0","event_id":"sha256:d74c8b990e0afc66a09b4bcc3e27b17d79ceee662a26a0f562329141e1d4697b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZVZAH2EABP3SH32JJ4O3CABU22/bundle.json","state_url":"https://pith.science/pith/ZVZAH2EABP3SH32JJ4O3CABU22/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZVZAH2EABP3SH32JJ4O3CABU22/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":"2026-05-27T16:57:29Z","links":{"resolver":"https://pith.science/pith/ZVZAH2EABP3SH32JJ4O3CABU22","bundle":"https://pith.science/pith/ZVZAH2EABP3SH32JJ4O3CABU22/bundle.json","state":"https://pith.science/pith/ZVZAH2EABP3SH32JJ4O3CABU22/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZVZAH2EABP3SH32JJ4O3CABU22/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:ZVZAH2EABP3SH32JJ4O3CABU22","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":"df3731c111d4babcfbb43cebe195d74174f853927269b300587781ebea14a796","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2013-09-26T07:50:58Z","title_canon_sha256":"2e2c26531b2defa56854b233d1259b77b44fabb5ac7f0c3c5a367bf0b722c151"},"schema_version":"1.0","source":{"id":"1309.6747","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1309.6747","created_at":"2026-05-18T01:47:26Z"},{"alias_kind":"arxiv_version","alias_value":"1309.6747v1","created_at":"2026-05-18T01:47:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1309.6747","created_at":"2026-05-18T01:47:26Z"},{"alias_kind":"pith_short_12","alias_value":"ZVZAH2EABP3S","created_at":"2026-05-18T12:28:09Z"},{"alias_kind":"pith_short_16","alias_value":"ZVZAH2EABP3SH32J","created_at":"2026-05-18T12:28:09Z"},{"alias_kind":"pith_short_8","alias_value":"ZVZAH2EA","created_at":"2026-05-18T12:28:09Z"}],"graph_snapshots":[{"event_id":"sha256:d74c8b990e0afc66a09b4bcc3e27b17d79ceee662a26a0f562329141e1d4697b","target":"graph","created_at":"2026-05-18T01:47:26Z","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":"At the LHC all processes are QCD ones, whether \"signal\" or \"background\". In this review the frontiers of current QCD research are addressed, towards increased understanding, improved calculational precision, and role in potential future discoveries. Issues raised include the limits of perturbative QCD calculations and parton distribution usage, the nature of multiparton interactions, the impact of colour reconnection on physical observables, the need for progress on hadronization modelling, the improvements of parton showers and their combination with the matrix-element description, the use of","authors_text":"T. Sj\\\"ostrand","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2013-09-26T07:50:58Z","title":"Challenges for QCD theory - some personal reflections -"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1309.6747","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":"sha256:2e5888037cba0d3e106e00830084065e85278143b2fdbd1efa5432967aa5ca8e","target":"record","created_at":"2026-05-18T01:47:26Z","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":"df3731c111d4babcfbb43cebe195d74174f853927269b300587781ebea14a796","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2013-09-26T07:50:58Z","title_canon_sha256":"2e2c26531b2defa56854b233d1259b77b44fabb5ac7f0c3c5a367bf0b722c151"},"schema_version":"1.0","source":{"id":"1309.6747","kind":"arxiv","version":1}},"canonical_sha256":"cd7203e8800bf723ef494f1db10034d6a75e5ae5aa72a687f0010008dca93721","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cd7203e8800bf723ef494f1db10034d6a75e5ae5aa72a687f0010008dca93721","first_computed_at":"2026-05-18T01:47:26.402949Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:47:26.402949Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"yb8XmZhSMdO5WOuhQmw8D9bRsXMqF7DDmVX9c66amjEcD34l11OjhSHaq2RRKT8qcEFKDgnDGv2dBzIBosgGDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:47:26.403597Z","signed_message":"canonical_sha256_bytes"},"source_id":"1309.6747","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2e5888037cba0d3e106e00830084065e85278143b2fdbd1efa5432967aa5ca8e","sha256:d74c8b990e0afc66a09b4bcc3e27b17d79ceee662a26a0f562329141e1d4697b"],"state_sha256":"ad3d2e9f36c4dae40dd2c1a0cc958988ad4c10cc54af7b597843f1b342bd199a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dt9oro9qj1dXHtd3JuyEg8bsxgmEC+9X8aJu+jyJmdnTEhI6HlG01re2teOHlPl2NMjRHpxA0aIj7IL6mfxvCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T16:57:29.464992Z","bundle_sha256":"a9743eb2a98f323192a99d3eea41e76081ae61fb20260f719a4ceff7e8dbd15a"}}