NNLO+PS W+W− production using jet veto resummation at NNLL′

• DOI: 10.1007/jhep12(2023)069
• Publication Date: 2023-12-21T12:01:57Z
• Authors: Alessandro Gavardi; Matthew A. Lim; Simone Alioli; Frank J. Tackmann
• Keywords: jet, transverse momentum; FOS: Physical sciences; QC770-798; 530; High Energy Physics - Experiment; High Energy Physics - Experiment (hep-ex); High Energy Physics - Phenomenology (hep-ph); Nuclear and particle physics. Atomic energy. Radioactivity; strong coupling; Renormalization Group; Factorization; info:eu-repo/classification/ddc/530; Effective Field Theories of QCD; Factorization; Higher-Order Perturbative Calculations; Renormalization Group; Resummation;; Monte Carlo; background; CMS; resolution; ATLAS; higher-order, 2; High Energy Physics - Phenomenology; parton, showers; resummation; Effective Field Theories of QCD; soft collinear effective theory; Higher-Order Perturbative Calculations; Resummation

A bstract We construct a novel event generator for the process $$ pp\to {\ell}^{-}{\overline{\nu}}_{\ell }{\ell^{\prime}}^{+}{\nu}_{\ell^{\prime }} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>pp</mml:mi> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>ℓ</mml:mi> <mml:mo>−</mml:mo> </mml:msup> <mml:msub> <mml:mover> <mml:mi>ν</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:msub> <mml:mo>′</mml:mo> <mml:mo>+</mml:mo> </mml:math> , which matches fixed-order predictions at next-to-next-to-leading order in strong coupling to parton shower program. The matching is achieved using G eneva method, this case exploiting resummed calculation hardest jet transverse momentum logarithmic accuracy obtained via soft-collinear effective theory and implemented C++ library SCETlib. This choice of resolution variable ensures that introduction veto, commonly used by experimental analyses reject multi-jet background events, does not result appearance unmitigated large logarithms low veto scales before showering. After validating our partonic results against publicly available fixed calculations, we compare measurements taken ATLAS CMS experiments, finding good agreement. first NNLO+PS accurate use as variable.