{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2023:CNR77N35WGTXHGGI7BQVOOUBXU","short_pith_number":"pith:CNR77N35","schema_version":"1.0","canonical_sha256":"1363ffb77db1a77398c8f861573a81bd3532c39ae4bcd7f144e8e0eee45a5741","source":{"kind":"arxiv","id":"2308.06389","version":1},"attestation_state":"computed","paper":{"title":"Matrix element corrections in the Pythia8 parton shower in the context of matched simulations at next-to-leading order","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Simone Amoroso, Stefano Frixione, Stephen Mrenna","submitted_at":"2023-08-11T21:11:13Z","abstract_excerpt":"We discuss the role of matrix element corrections (MEC) to parton showers in the context of MC@NLO-type matchings for processes that feature unstable resonances, where MEC are liable to result in double-counting issues, and are thus generally not employed. By working with Pythia8, we show that disabling all MEC is actually unnecessary in computations based on the narrow-width approximation, and we propose alternative MEC settings which, while still avoiding double counting, allow one to include hard-recoil effects in the simulations of resonance decays. We illustrate our findings by considerin"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2308.06389","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2023-08-11T21:11:13Z","cross_cats_sorted":[],"title_canon_sha256":"59945039f3e94016d8e698c3696ac62d049a10888d52464b7524b7a7aec3a5ff","abstract_canon_sha256":"96fc9c3c49d5f727921448e25f71527afcdeb281097a48bf5ed07594d4460bf1"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:40:39.261889Z","signature_b64":"k4N5x9RHX79lrpIXP8TNFBqELQ623akTOf5E3XD+ng729QAbp3tJwRTsMBxPcNupanR7KHXOGpOJerYaQMzHDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1363ffb77db1a77398c8f861573a81bd3532c39ae4bcd7f144e8e0eee45a5741","last_reissued_at":"2026-07-05T06:40:39.261416Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:40:39.261416Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Matrix element corrections in the Pythia8 parton shower in the context of matched simulations at next-to-leading order","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Simone Amoroso, Stefano Frixione, Stephen Mrenna","submitted_at":"2023-08-11T21:11:13Z","abstract_excerpt":"We discuss the role of matrix element corrections (MEC) to parton showers in the context of MC@NLO-type matchings for processes that feature unstable resonances, where MEC are liable to result in double-counting issues, and are thus generally not employed. By working with Pythia8, we show that disabling all MEC is actually unnecessary in computations based on the narrow-width approximation, and we propose alternative MEC settings which, while still avoiding double counting, allow one to include hard-recoil effects in the simulations of resonance decays. We illustrate our findings by considerin"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2308.06389","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2308.06389/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2308.06389","created_at":"2026-07-05T06:40:39.261473+00:00"},{"alias_kind":"arxiv_version","alias_value":"2308.06389v1","created_at":"2026-07-05T06:40:39.261473+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2308.06389","created_at":"2026-07-05T06:40:39.261473+00:00"},{"alias_kind":"pith_short_12","alias_value":"CNR77N35WGTX","created_at":"2026-07-05T06:40:39.261473+00:00"},{"alias_kind":"pith_short_16","alias_value":"CNR77N35WGTXHGGI","created_at":"2026-07-05T06:40:39.261473+00:00"},{"alias_kind":"pith_short_8","alias_value":"CNR77N35","created_at":"2026-07-05T06:40:39.261473+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2509.02348","citing_title":"Herwig 7 with the Lund String Model: Tuning and Comparative Hadronization Studies","ref_index":41,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/CNR77N35WGTXHGGI7BQVOOUBXU","json":"https://pith.science/pith/CNR77N35WGTXHGGI7BQVOOUBXU.json","graph_json":"https://pith.science/api/pith-number/CNR77N35WGTXHGGI7BQVOOUBXU/graph.json","events_json":"https://pith.science/api/pith-number/CNR77N35WGTXHGGI7BQVOOUBXU/events.json","paper":"https://pith.science/paper/CNR77N35"},"agent_actions":{"view_html":"https://pith.science/pith/CNR77N35WGTXHGGI7BQVOOUBXU","download_json":"https://pith.science/pith/CNR77N35WGTXHGGI7BQVOOUBXU.json","view_paper":"https://pith.science/paper/CNR77N35","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2308.06389&json=true","fetch_graph":"https://pith.science/api/pith-number/CNR77N35WGTXHGGI7BQVOOUBXU/graph.json","fetch_events":"https://pith.science/api/pith-number/CNR77N35WGTXHGGI7BQVOOUBXU/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/CNR77N35WGTXHGGI7BQVOOUBXU/action/timestamp_anchor","attest_storage":"https://pith.science/pith/CNR77N35WGTXHGGI7BQVOOUBXU/action/storage_attestation","attest_author":"https://pith.science/pith/CNR77N35WGTXHGGI7BQVOOUBXU/action/author_attestation","sign_citation":"https://pith.science/pith/CNR77N35WGTXHGGI7BQVOOUBXU/action/citation_signature","submit_replication":"https://pith.science/pith/CNR77N35WGTXHGGI7BQVOOUBXU/action/replication_record"}},"created_at":"2026-07-05T06:40:39.261473+00:00","updated_at":"2026-07-05T06:40:39.261473+00:00"}