KrkNLO matching for colour-singlet processes

• DOI: 10.48550/arxiv.2409.16417
• Publication Date: 2024-09-24
• Authors: Prantik Sarmah; Andrzej Siódmok; James Whitehead
• Keywords: parton shower; High Energy Physics - Phenomenology; High Energy Physics - Phenomenology (hep-ph); higher-order perturbative calculations; Nuclear and particle physics. Atomic energy. Radioactivity; Higher-Order Perturbative Calculations; FOS: Physical sciences; QC770-798; Parton Shower

Matched calculations combining perturbative QCD with parton showers are an indispensable tool for LHC physics. Two methods NLO matching in widespread use: MC@NLO and POWHEG. We describe alternative, KrkNLO, reformulated to be easily applicable any colour-singlet process. The primary distinguishing characteristic of KrkNLO is its use alternative factorisation scheme, the 'Krk' achieve accuracy. general implementation Herwig 7, using diphoton production as a test systematically compare predictions those produced by several different choices shower scale, both truncated one-emission running completion, ATLAS data from Run 2.