{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:UDPYE4I4U3A4BTR53OCCK52EZ5","short_pith_number":"pith:UDPYE4I4","canonical_record":{"source":{"id":"2310.04160","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2023-10-06T11:18:39Z","cross_cats_sorted":[],"title_canon_sha256":"1c06d563cba850945742a80198843a44319b873c573b2c443c0ffab6bbc9f03b","abstract_canon_sha256":"7c790603f5195a261187f25cf2472312de6551c932520048c929851a0f42eb56"},"schema_version":"1.0"},"canonical_sha256":"a0df82711ca6c1c0ce3ddb84257744cf75c013a73b7cadf05030d50b0271a333","source":{"kind":"arxiv","id":"2310.04160","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2310.04160","created_at":"2026-07-05T06:57:59Z"},{"alias_kind":"arxiv_version","alias_value":"2310.04160v1","created_at":"2026-07-05T06:57:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2310.04160","created_at":"2026-07-05T06:57:59Z"},{"alias_kind":"pith_short_12","alias_value":"UDPYE4I4U3A4","created_at":"2026-07-05T06:57:59Z"},{"alias_kind":"pith_short_16","alias_value":"UDPYE4I4U3A4BTR5","created_at":"2026-07-05T06:57:59Z"},{"alias_kind":"pith_short_8","alias_value":"UDPYE4I4","created_at":"2026-07-05T06:57:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:UDPYE4I4U3A4BTR53OCCK52EZ5","target":"record","payload":{"canonical_record":{"source":{"id":"2310.04160","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2023-10-06T11:18:39Z","cross_cats_sorted":[],"title_canon_sha256":"1c06d563cba850945742a80198843a44319b873c573b2c443c0ffab6bbc9f03b","abstract_canon_sha256":"7c790603f5195a261187f25cf2472312de6551c932520048c929851a0f42eb56"},"schema_version":"1.0"},"canonical_sha256":"a0df82711ca6c1c0ce3ddb84257744cf75c013a73b7cadf05030d50b0271a333","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:57:59.184818Z","signature_b64":"IlpozYdItQ8j2idjeX0lNBZ+QFncgBmafqVtlfdXalsHZz+ayYEymqu5RtGpTdHrwOQ9QK1y2I58DfDMRoObAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a0df82711ca6c1c0ce3ddb84257744cf75c013a73b7cadf05030d50b0271a333","last_reissued_at":"2026-07-05T06:57:59.184360Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:57:59.184360Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2310.04160","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":"2026-07-05T06:57:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YTC3sTVrmr6eaK3+Z2s8moj1BRY/Hc/Lj3wNTu8Q0pRHd5Fx4Z5W2uaOGsJU5O89q4K71IaWeWHhfusUGhXJAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T04:22:07.667457Z"},"content_sha256":"3f58ef4d9b5c78673f3d4c1ccfc4cbe371d49ecbfdec3f826119414ef4d33da2","schema_version":"1.0","event_id":"sha256:3f58ef4d9b5c78673f3d4c1ccfc4cbe371d49ecbfdec3f826119414ef4d33da2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:UDPYE4I4U3A4BTR53OCCK52EZ5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A new way of reducing negative weights in MC@NLO","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Paolo Torrielli, Rikkert Frederix","submitted_at":"2023-10-06T11:18:39Z","abstract_excerpt":"We introduce a new technique, that we dub Born spreading, aimed at reducing the number of negative-weight $\\mathbb S$ events in the MC@NLO matching of NLO calculations with parton-shower simulations. We show that such a technique, based on a re-distribution of Born matrix elements in the radiative phase space, achieves a sizeable reduction of negative-weight events at little computational cost. The method does not induce any biases in physical distributions."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2310.04160","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/2310.04160/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T06:57:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bHOeYZpiQC/DEFIBCah5I1D3PLPQNOSY+aDTxXKTPEetbENgT3UnPzY0RyUzTM3mobIiM+UFDLamrVKOon/ZBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T04:22:07.667964Z"},"content_sha256":"1950319ca2856f81732e93dca71f9567acca94fed86b5ab245fa5297236dfb3f","schema_version":"1.0","event_id":"sha256:1950319ca2856f81732e93dca71f9567acca94fed86b5ab245fa5297236dfb3f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UDPYE4I4U3A4BTR53OCCK52EZ5/bundle.json","state_url":"https://pith.science/pith/UDPYE4I4U3A4BTR53OCCK52EZ5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UDPYE4I4U3A4BTR53OCCK52EZ5/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":"2026-08-15T04:22:07Z","links":{"resolver":"https://pith.science/pith/UDPYE4I4U3A4BTR53OCCK52EZ5","bundle":"https://pith.science/pith/UDPYE4I4U3A4BTR53OCCK52EZ5/bundle.json","state":"https://pith.science/pith/UDPYE4I4U3A4BTR53OCCK52EZ5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UDPYE4I4U3A4BTR53OCCK52EZ5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:UDPYE4I4U3A4BTR53OCCK52EZ5","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":"7c790603f5195a261187f25cf2472312de6551c932520048c929851a0f42eb56","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2023-10-06T11:18:39Z","title_canon_sha256":"1c06d563cba850945742a80198843a44319b873c573b2c443c0ffab6bbc9f03b"},"schema_version":"1.0","source":{"id":"2310.04160","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2310.04160","created_at":"2026-07-05T06:57:59Z"},{"alias_kind":"arxiv_version","alias_value":"2310.04160v1","created_at":"2026-07-05T06:57:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2310.04160","created_at":"2026-07-05T06:57:59Z"},{"alias_kind":"pith_short_12","alias_value":"UDPYE4I4U3A4","created_at":"2026-07-05T06:57:59Z"},{"alias_kind":"pith_short_16","alias_value":"UDPYE4I4U3A4BTR5","created_at":"2026-07-05T06:57:59Z"},{"alias_kind":"pith_short_8","alias_value":"UDPYE4I4","created_at":"2026-07-05T06:57:59Z"}],"graph_snapshots":[{"event_id":"sha256:1950319ca2856f81732e93dca71f9567acca94fed86b5ab245fa5297236dfb3f","target":"graph","created_at":"2026-07-05T06:57:59Z","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/2310.04160/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We introduce a new technique, that we dub Born spreading, aimed at reducing the number of negative-weight $\\mathbb S$ events in the MC@NLO matching of NLO calculations with parton-shower simulations. We show that such a technique, based on a re-distribution of Born matrix elements in the radiative phase space, achieves a sizeable reduction of negative-weight events at little computational cost. The method does not induce any biases in physical distributions.","authors_text":"Paolo Torrielli, Rikkert Frederix","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2023-10-06T11:18:39Z","title":"A new way of reducing negative weights in MC@NLO"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2310.04160","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":"sha256:3f58ef4d9b5c78673f3d4c1ccfc4cbe371d49ecbfdec3f826119414ef4d33da2","target":"record","created_at":"2026-07-05T06:57:59Z","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":"7c790603f5195a261187f25cf2472312de6551c932520048c929851a0f42eb56","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2023-10-06T11:18:39Z","title_canon_sha256":"1c06d563cba850945742a80198843a44319b873c573b2c443c0ffab6bbc9f03b"},"schema_version":"1.0","source":{"id":"2310.04160","kind":"arxiv","version":1}},"canonical_sha256":"a0df82711ca6c1c0ce3ddb84257744cf75c013a73b7cadf05030d50b0271a333","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a0df82711ca6c1c0ce3ddb84257744cf75c013a73b7cadf05030d50b0271a333","first_computed_at":"2026-07-05T06:57:59.184360Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:57:59.184360Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"IlpozYdItQ8j2idjeX0lNBZ+QFncgBmafqVtlfdXalsHZz+ayYEymqu5RtGpTdHrwOQ9QK1y2I58DfDMRoObAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T06:57:59.184818Z","signed_message":"canonical_sha256_bytes"},"source_id":"2310.04160","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3f58ef4d9b5c78673f3d4c1ccfc4cbe371d49ecbfdec3f826119414ef4d33da2","sha256:1950319ca2856f81732e93dca71f9567acca94fed86b5ab245fa5297236dfb3f"],"state_sha256":"5c6ee0b909ad604086e007d2b881924bfc6b26c2799c5e4a51ce0f468a5137a6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DI/kmmIQIVjHbD/+utTmWw/LlzPNCQr86gEKDKcMAdNMhXf3HtdmQDfbSkYD5oTYAHqBKlg7NUehUjvAc8ItCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-15T04:22:07.672218Z","bundle_sha256":"94de717e8cfc9fa4c0f8dd8b9254f0388761f1b94f7c0deac4bfe49dc9a3f574"}}