{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2021:CVZA3PTLF4JSU6XT4TAJQ5HCGT","short_pith_number":"pith:CVZA3PTL","schema_version":"1.0","canonical_sha256":"15720dbe6b2f132a7af3e4c09874e234fc67d3e599d7546db5d1f1eb22b1afa9","source":{"kind":"arxiv","id":"2107.04051","version":2},"attestation_state":"computed","paper":{"title":"Initial State Radiation in the Herwig 7 Angular-Ordered Parton Shower","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Gavin Bewick, Michael H. Seymour, Peter Richardson, Silvia Ferrario Ravasio","submitted_at":"2021-07-08T18:01:39Z","abstract_excerpt":"We study the simulation of initial-state radiation in angular-ordered parton showers in order to investigate how different interpretations of the ordering variable affect the logarithmic accuracy of such showers. This also enables us to implement a recoil scheme which is consistent between final-state and initial-state radiation. We present optimal values of the strong coupling and intrinsic transverse momentum to be used in each version of the parton shower, tuned using $Z^0$-boson production at the LHC at 7 TeV. With these tuned showers, we perform a phenomenological study of the Drell-Yan p"},"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":"2107.04051","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2021-07-08T18:01:39Z","cross_cats_sorted":[],"title_canon_sha256":"7a76691a037e060d43e1a99a97c04f5eb749a1c91c71eada269fa2b99587180a","abstract_canon_sha256":"7596711cfbbb383af6ee12d39ba21c18c02608a9df53b853f8415409e30bf8a0"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:51:08.153305Z","signature_b64":"suUJZRHqz8KaAiq08xskNMbgX4PcMouTt9vBMzxDfLrSLAC68onWp1vrdcd3DNqw46pj5wYWok5JnE5y8LVDAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"15720dbe6b2f132a7af3e4c09874e234fc67d3e599d7546db5d1f1eb22b1afa9","last_reissued_at":"2026-07-05T03:51:08.152878Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:51:08.152878Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Initial State Radiation in the Herwig 7 Angular-Ordered Parton Shower","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Gavin Bewick, Michael H. Seymour, Peter Richardson, Silvia Ferrario Ravasio","submitted_at":"2021-07-08T18:01:39Z","abstract_excerpt":"We study the simulation of initial-state radiation in angular-ordered parton showers in order to investigate how different interpretations of the ordering variable affect the logarithmic accuracy of such showers. This also enables us to implement a recoil scheme which is consistent between final-state and initial-state radiation. We present optimal values of the strong coupling and intrinsic transverse momentum to be used in each version of the parton shower, tuned using $Z^0$-boson production at the LHC at 7 TeV. With these tuned showers, we perform a phenomenological study of the Drell-Yan p"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.04051","kind":"arxiv","version":2},"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/2107.04051/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":"2107.04051","created_at":"2026-07-05T03:51:08.152935+00:00"},{"alias_kind":"arxiv_version","alias_value":"2107.04051v2","created_at":"2026-07-05T03:51:08.152935+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.04051","created_at":"2026-07-05T03:51:08.152935+00:00"},{"alias_kind":"pith_short_12","alias_value":"CVZA3PTLF4JS","created_at":"2026-07-05T03:51:08.152935+00:00"},{"alias_kind":"pith_short_16","alias_value":"CVZA3PTLF4JSU6XT","created_at":"2026-07-05T03:51:08.152935+00:00"},{"alias_kind":"pith_short_8","alias_value":"CVZA3PTL","created_at":"2026-07-05T03:51:08.152935+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/CVZA3PTLF4JSU6XT4TAJQ5HCGT","json":"https://pith.science/pith/CVZA3PTLF4JSU6XT4TAJQ5HCGT.json","graph_json":"https://pith.science/api/pith-number/CVZA3PTLF4JSU6XT4TAJQ5HCGT/graph.json","events_json":"https://pith.science/api/pith-number/CVZA3PTLF4JSU6XT4TAJQ5HCGT/events.json","paper":"https://pith.science/paper/CVZA3PTL"},"agent_actions":{"view_html":"https://pith.science/pith/CVZA3PTLF4JSU6XT4TAJQ5HCGT","download_json":"https://pith.science/pith/CVZA3PTLF4JSU6XT4TAJQ5HCGT.json","view_paper":"https://pith.science/paper/CVZA3PTL","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2107.04051&json=true","fetch_graph":"https://pith.science/api/pith-number/CVZA3PTLF4JSU6XT4TAJQ5HCGT/graph.json","fetch_events":"https://pith.science/api/pith-number/CVZA3PTLF4JSU6XT4TAJQ5HCGT/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/CVZA3PTLF4JSU6XT4TAJQ5HCGT/action/timestamp_anchor","attest_storage":"https://pith.science/pith/CVZA3PTLF4JSU6XT4TAJQ5HCGT/action/storage_attestation","attest_author":"https://pith.science/pith/CVZA3PTLF4JSU6XT4TAJQ5HCGT/action/author_attestation","sign_citation":"https://pith.science/pith/CVZA3PTLF4JSU6XT4TAJQ5HCGT/action/citation_signature","submit_replication":"https://pith.science/pith/CVZA3PTLF4JSU6XT4TAJQ5HCGT/action/replication_record"}},"created_at":"2026-07-05T03:51:08.152935+00:00","updated_at":"2026-07-05T03:51:08.152935+00:00"}