CERN Accelerating science

Article
Report number	arXiv:2102.07783 ; IPPP/20/79 ; CERN-TH-2021-022
Title	Four-lepton production in gluon fusion at NLO matched to parton showers
Author(s)	Alioli, Simone (Milan Bicocca U.) ; Ferrario Ravasio, Silvia (Oxford U., Theor. Phys.) ; Lindert, Jonas M. (Sussex U., Astron. Ctr.) ; Röntsch, Raoul (CERN)
Publication	2021-08-03
Imprint	2021-02-15
Number of pages	15
Note	15 pages, 13 figures, 1 table
In:	Eur. Phys. J. C 81 (2021) 687
DOI	10.1140/epjc/s10052-021-09470-5
Subject category	hep-ex ; Particle Physics - Experiment ; hep-ph ; Particle Physics - Phenomenology
Abstract	We present a calculation of the next-to-leading order (NLO) QCD corrections to gluon-induced electroweak gauge boson pair production, $gg \to ZZ$ and $gg \to W^+W^-$, matched to the PYTHIA8 parton shower in the POWHEG approach. The calculation consistently incorporates the continuum background, the Higgs-mediated $gg\to H^* \to VV$ process, and their interference. We consider leptonic decay modes of the massive vector bosons and retain offshell and non-resonant contributions. The processes considered are loop-induced at leading order and thus contain two-loop virtual contributions as well as loop-squared real contributions. Parton-shower effects are found to be marginal in inclusive observables and quite sizeable in observables that are exclusive in additional jet radiation. The Monte Carlo generator presented here allows for realistic experimental effects to be incorporated in state-of-the-art precision analyses of diboson production and of the Higgs boson in the offshell regime.
Copyright/License	publication: © 2021-2025 The Author(s) (License: CC-BY-4.0), sponsored by SCOAP³ preprint: (License: arXiv nonexclusive-distrib 1.0)

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