{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:VUPFN34ALOKS2I3KBTFLX6LVBP","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":"f01b07c1c3e164dfff2a7e43d6010e9176bf9fcd4d6535afdcc7b7c4affe9884","cross_cats_sorted":["hep-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2009-03-23T17:59:54Z","title_canon_sha256":"7a5d6ae745c025170bc09c34479d0c545dd25648fb299207d92e4aaf123360fa"},"schema_version":"1.0","source":{"id":"0903.3918","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0903.3918","created_at":"2026-07-04T15:40:11Z"},{"alias_kind":"arxiv_version","alias_value":"0903.3918v2","created_at":"2026-07-04T15:40:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.3918","created_at":"2026-07-04T15:40:11Z"},{"alias_kind":"pith_short_12","alias_value":"VUPFN34ALOKS","created_at":"2026-07-04T15:40:11Z"},{"alias_kind":"pith_short_16","alias_value":"VUPFN34ALOKS2I3K","created_at":"2026-07-04T15:40:11Z"},{"alias_kind":"pith_short_8","alias_value":"VUPFN34A","created_at":"2026-07-04T15:40:11Z"}],"graph_snapshots":[{"event_id":"sha256:123fa90859636bc8ceea6bfb9001ae529153d2ca5de8a7a171e9598694c6eaef","target":"graph","created_at":"2026-07-04T15:40:11Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/0903.3918/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We study Matrix Element corrections as implemented in four popular event generators for hadron collisions. We compare PYTHIA, HERWIG, ALPGEN and SHERPA in the Z/gamma* inclusive production at LHC. PYTHIA and HERWIG are able to correct the first emission from the shower taking the Matrix Element calculation for one additional parton into account. SHERPA and ALPGEN are able to take into account Matrix Element corrections not only for one, but rather for several hard emissions from the incoming partons. This can be done at the price of introducing a separation cut to distinguish a Matrix Element ","authors_text":"J. M. Butterworth, P. Lenzi","cross_cats":["hep-ex"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2009-03-23T17:59:54Z","title":"A study on Matrix Element corrections in inclusive Z/ gamma* production at LHC as implemented in PYTHIA, HERWIG, ALPGEN and SHERPA"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.3918","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":"sha256:05fbdadddf04654ada34a26eeb2ccddbfa316f92f6c90e352925cc7c07599bfd","target":"record","created_at":"2026-07-04T15:40:11Z","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":"f01b07c1c3e164dfff2a7e43d6010e9176bf9fcd4d6535afdcc7b7c4affe9884","cross_cats_sorted":["hep-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2009-03-23T17:59:54Z","title_canon_sha256":"7a5d6ae745c025170bc09c34479d0c545dd25648fb299207d92e4aaf123360fa"},"schema_version":"1.0","source":{"id":"0903.3918","kind":"arxiv","version":2}},"canonical_sha256":"ad1e56ef805b952d236a0ccabbf9750beeed54c9775c73695bc481f8750b5bd7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ad1e56ef805b952d236a0ccabbf9750beeed54c9775c73695bc481f8750b5bd7","first_computed_at":"2026-07-04T15:40:11.274573Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:40:11.274573Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"PshHiSb+MtgFhESRVeJcw4AxU+Q+o6YopbQI1ag4yQE/2cH3uPQ5GLCgIxwl484xPzCeoSD/uY8mcd5ZkXSSCg==","signature_status":"signed_v1","signed_at":"2026-07-04T15:40:11.275016Z","signed_message":"canonical_sha256_bytes"},"source_id":"0903.3918","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:05fbdadddf04654ada34a26eeb2ccddbfa316f92f6c90e352925cc7c07599bfd","sha256:123fa90859636bc8ceea6bfb9001ae529153d2ca5de8a7a171e9598694c6eaef"],"state_sha256":"23cb2f247c734376240defd0a21579da109a25d14e0431f93c84196152392fa0"}