{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:ACRNJMXVQMKRRT22T7QB5FZ3OP","short_pith_number":"pith:ACRNJMXV","canonical_record":{"source":{"id":"1608.03765","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2016-08-12T12:02:41Z","cross_cats_sorted":[],"title_canon_sha256":"de38de9179d2d468d96d498ed9b72e402406ee9821db82d3362198ae9380ea1a","abstract_canon_sha256":"382c276df75f417f4d4ab1eb8ba5fbdf39b247402241b606192a87d04eb9926f"},"schema_version":"1.0"},"canonical_sha256":"00a2d4b2f5831518cf5a9fe01e973b73f814c9a8fed21ceacff4ce71a05ad746","source":{"kind":"arxiv","id":"1608.03765","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.03765","created_at":"2026-05-18T00:54:34Z"},{"alias_kind":"arxiv_version","alias_value":"1608.03765v3","created_at":"2026-05-18T00:54:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.03765","created_at":"2026-05-18T00:54:34Z"},{"alias_kind":"pith_short_12","alias_value":"ACRNJMXVQMKR","created_at":"2026-05-18T12:30:07Z"},{"alias_kind":"pith_short_16","alias_value":"ACRNJMXVQMKRRT22","created_at":"2026-05-18T12:30:07Z"},{"alias_kind":"pith_short_8","alias_value":"ACRNJMXV","created_at":"2026-05-18T12:30:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:ACRNJMXVQMKRRT22T7QB5FZ3OP","target":"record","payload":{"canonical_record":{"source":{"id":"1608.03765","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2016-08-12T12:02:41Z","cross_cats_sorted":[],"title_canon_sha256":"de38de9179d2d468d96d498ed9b72e402406ee9821db82d3362198ae9380ea1a","abstract_canon_sha256":"382c276df75f417f4d4ab1eb8ba5fbdf39b247402241b606192a87d04eb9926f"},"schema_version":"1.0"},"canonical_sha256":"00a2d4b2f5831518cf5a9fe01e973b73f814c9a8fed21ceacff4ce71a05ad746","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:54:34.890229Z","signature_b64":"ii7vWSytpZ80Q+TH68sqlXSTc1ZMLVL3LMtep8b+siF7uJCBSCi8aX3mdDy+mgNjriyL75qMFc6ojfy0v63aBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"00a2d4b2f5831518cf5a9fe01e973b73f814c9a8fed21ceacff4ce71a05ad746","last_reissued_at":"2026-05-18T00:54:34.889586Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:54:34.889586Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1608.03765","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:54:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BzTDtosGahJdlPNr9JaWfLrFfN1ErAwKEsQWHHbta6cpXmwNLuNuO34rljrjFtqmRhwCus4JVHH6BD8cFcUZDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T12:41:50.749260Z"},"content_sha256":"36a225cd43154c51af441491e15ddb5fd4c87f60c76a652a79f801b616324d65","schema_version":"1.0","event_id":"sha256:36a225cd43154c51af441491e15ddb5fd4c87f60c76a652a79f801b616324d65"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:ACRNJMXVQMKRRT22T7QB5FZ3OP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Generation of central exclusive final states","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Leif L\\\"onnblad, Radek \\v{Z}leb\\v{c}\\'ik","submitted_at":"2016-08-12T12:02:41Z","abstract_excerpt":"We present a scheme for the generation of central exclusive final states in the Pythia 8 program. The implementation allows for the investigation of higher order corrections to such exclusive processes as approximated by the initial-state parton shower in Pythia 8. To achieve this, the spin and colour decomposition of the initial-state shower has been worked out, in order to determine the probability that a partonic state generated from an inclusive sub-process followed by a series of initial-state parton splittings can be considered as an approximation of an exclusive colour- and spin-singlet"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.03765","kind":"arxiv","version":3},"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":"2026-05-18T00:54:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LMOfb0NxCb0aLvh4UuwE9iKbUmeTjPBg8Lh4UTk2aBG5b6XwqnPRqn0gltdLYwRSR/A9FVc7eI+VrLHoF7bFCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T12:41:50.749632Z"},"content_sha256":"f8134d4eb5f997da47efcac1625e68cfc2b8c022758bcd28bc206daf613ad10d","schema_version":"1.0","event_id":"sha256:f8134d4eb5f997da47efcac1625e68cfc2b8c022758bcd28bc206daf613ad10d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ACRNJMXVQMKRRT22T7QB5FZ3OP/bundle.json","state_url":"https://pith.science/pith/ACRNJMXVQMKRRT22T7QB5FZ3OP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ACRNJMXVQMKRRT22T7QB5FZ3OP/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":"2026-05-27T12:41:50Z","links":{"resolver":"https://pith.science/pith/ACRNJMXVQMKRRT22T7QB5FZ3OP","bundle":"https://pith.science/pith/ACRNJMXVQMKRRT22T7QB5FZ3OP/bundle.json","state":"https://pith.science/pith/ACRNJMXVQMKRRT22T7QB5FZ3OP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ACRNJMXVQMKRRT22T7QB5FZ3OP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:ACRNJMXVQMKRRT22T7QB5FZ3OP","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":"382c276df75f417f4d4ab1eb8ba5fbdf39b247402241b606192a87d04eb9926f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2016-08-12T12:02:41Z","title_canon_sha256":"de38de9179d2d468d96d498ed9b72e402406ee9821db82d3362198ae9380ea1a"},"schema_version":"1.0","source":{"id":"1608.03765","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.03765","created_at":"2026-05-18T00:54:34Z"},{"alias_kind":"arxiv_version","alias_value":"1608.03765v3","created_at":"2026-05-18T00:54:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.03765","created_at":"2026-05-18T00:54:34Z"},{"alias_kind":"pith_short_12","alias_value":"ACRNJMXVQMKR","created_at":"2026-05-18T12:30:07Z"},{"alias_kind":"pith_short_16","alias_value":"ACRNJMXVQMKRRT22","created_at":"2026-05-18T12:30:07Z"},{"alias_kind":"pith_short_8","alias_value":"ACRNJMXV","created_at":"2026-05-18T12:30:07Z"}],"graph_snapshots":[{"event_id":"sha256:f8134d4eb5f997da47efcac1625e68cfc2b8c022758bcd28bc206daf613ad10d","target":"graph","created_at":"2026-05-18T00:54:34Z","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 present a scheme for the generation of central exclusive final states in the Pythia 8 program. The implementation allows for the investigation of higher order corrections to such exclusive processes as approximated by the initial-state parton shower in Pythia 8. To achieve this, the spin and colour decomposition of the initial-state shower has been worked out, in order to determine the probability that a partonic state generated from an inclusive sub-process followed by a series of initial-state parton splittings can be considered as an approximation of an exclusive colour- and spin-singlet","authors_text":"Leif L\\\"onnblad, Radek \\v{Z}leb\\v{c}\\'ik","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2016-08-12T12:02:41Z","title":"Generation of central exclusive final states"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.03765","kind":"arxiv","version":3},"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":"sha256:36a225cd43154c51af441491e15ddb5fd4c87f60c76a652a79f801b616324d65","target":"record","created_at":"2026-05-18T00:54:34Z","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":"382c276df75f417f4d4ab1eb8ba5fbdf39b247402241b606192a87d04eb9926f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2016-08-12T12:02:41Z","title_canon_sha256":"de38de9179d2d468d96d498ed9b72e402406ee9821db82d3362198ae9380ea1a"},"schema_version":"1.0","source":{"id":"1608.03765","kind":"arxiv","version":3}},"canonical_sha256":"00a2d4b2f5831518cf5a9fe01e973b73f814c9a8fed21ceacff4ce71a05ad746","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"00a2d4b2f5831518cf5a9fe01e973b73f814c9a8fed21ceacff4ce71a05ad746","first_computed_at":"2026-05-18T00:54:34.889586Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:54:34.889586Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ii7vWSytpZ80Q+TH68sqlXSTc1ZMLVL3LMtep8b+siF7uJCBSCi8aX3mdDy+mgNjriyL75qMFc6ojfy0v63aBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:54:34.890229Z","signed_message":"canonical_sha256_bytes"},"source_id":"1608.03765","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:36a225cd43154c51af441491e15ddb5fd4c87f60c76a652a79f801b616324d65","sha256:f8134d4eb5f997da47efcac1625e68cfc2b8c022758bcd28bc206daf613ad10d"],"state_sha256":"c23516eb713060a47a0e4c549b906c0f43f2269d988d7478370db94094983a63"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+HA1BbCrz1W65hoEnTIYXbAbF6KfK56IQdXQErl9ClOr22WrrzbgoObr3mvgLnapc5oibHlqglC4u+wm1nKUDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T12:41:50.752430Z","bundle_sha256":"d986d6ea9b4000c9c9ef124044496a9b02587fcb640df8f5e28196d460242ba6"}}