{"paper":{"title":"Logarithmically-accurate showers with massive quarks","license":"http://creativecommons.org/licenses/by/4.0/","headline":"PanScales final-state showers now include quark masses at next-to-leading logarithmic accuracy while preserving their original performance for massless observables.","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Alba Soto-Ontoso, Gregory Soyez, Melissa van Beekveld, Rob Verheyen, Silvia Ferrario Ravasio","submitted_at":"2026-05-13T18:00:00Z","abstract_excerpt":"We formulate PanScales final-state showers that account for quark masses and achieve next-to-leading logarithmic accuracy, while preserving the original accuracy of the showers for observables where the mass of the quarks is irrelevant. We validate the accuracy of the shower algorithms by performing fixed-order tests up to second order in the strong coupling constant, and all-order comparisons to (semi-)analytic resummed calculations for a series of observables, including Lund-tree shapes, non-global energy flows and Lund sub-jet multiplicities. We also include some phenomenological studies us"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"We formulate PanScales final-state showers that account for quark masses and achieve next-to-leading logarithmic accuracy, while preserving the original accuracy of the showers for observables where the mass of the quarks is irrelevant.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The modifications for quark masses can be implemented without spoiling the logarithmic accuracy for massless observables, and the fixed-order tests plus all-order comparisons are sufficient to establish NLL accuracy for the targeted observables.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"PanScales final-state showers now include quark masses at NLL accuracy while keeping original accuracy for massless observables.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"PanScales final-state showers now include quark masses at next-to-leading logarithmic accuracy while preserving their original performance for massless observables.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"df53a02bc32668ba3ed132385bff5766f57cf42ad1edd77c632825e75db443fe"},"source":{"id":"2605.13953","kind":"arxiv","version":1},"verdict":{"id":"fb8508ee-bd65-4dd6-88d9-76c3ea01c7d9","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-15T02:41:53.679262Z","strongest_claim":"We formulate PanScales final-state showers that account for quark masses and achieve next-to-leading logarithmic accuracy, while preserving the original accuracy of the showers for observables where the mass of the quarks is irrelevant.","one_line_summary":"PanScales final-state showers now include quark masses at NLL accuracy while keeping original accuracy for massless observables.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The modifications for quark masses can be implemented without spoiling the logarithmic accuracy for massless observables, and the fixed-order tests plus all-order comparisons are sufficient to establish NLL accuracy for the targeted observables.","pith_extraction_headline":"PanScales final-state showers now include quark masses at next-to-leading logarithmic accuracy while preserving their original performance for massless observables."},"references":{"count":57,"sample":[{"doi":"","year":2022,"title":"S. Caletti, A. J. Larkoski, S. Marzani and D. Reichelt,Practical jet flavour through NNLO, Eur. Phys. J. C82(2022) 632, [2205.01109]","work_id":"8c469954-1a54-4229-8e8d-ceaf5b990e77","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2023,"title":"M. Czakon, A. Mitov and R. Poncelet,Infrared-safe flavoured anti-k T jets,JHEP04(2023) 138, [2205.11879]","work_id":"c1a6ba82-7266-4014-a201-ebcf750c0a64","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2023,"title":"R. Gauld, A. Huss and G. Stagnitto,Flavor Identification of Reconstructed Hadronic Jets, Phys. Rev. Lett.130(2023) 161901, [2208.11138]","work_id":"4dc83ddb-5cfe-480c-8688-9609afabbab4","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2023,"title":"F. Caola, R. Grabarczyk, M. L. Hutt, G. P. Salam, L. Scyboz and J. Thaler,Flavored jets with exact anti-k t kinematics and tests of infrared and collinear safety,Phys. Rev. D108 (2023) 094010, [2306.0","work_id":"0e5df0f7-32ed-4f20-b197-d6e143fbb166","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2025,"title":"Behring et al.,Flavoured jet algorithms: a comparative study,JHEP09 (2025) 149, [2506.13449]","work_id":"febdedb2-03fc-437e-99f7-1d45947d36c1","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":57,"snapshot_sha256":"3e0efc937507d370c7d222263dfd0edaed5536fc7ea95b2d3c7d0db4291e2b77","internal_anchors":17},"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"}