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We calculate the process $pp\to W^+W^-\to e^+ \nu_e \mu^-\bar{\nu}_\mu$ atNLO QCD, including also effective field theory (EFT) operators mediating the$ggW^+W^-$ interaction, which first occur at dimension eight. We furthercombine the NLO and EFT matrix elements produced by GoSam with theHERWIG7/MATCHBOX framework, which offers the possibility to study the impact ofa parton shower. We assess the effects of the anomalous couplings by comparingthem to top-mass effects as well as uncertainties related to variations of therenormalisation, factorisation and hard shower scales.

Anomalous coupling, top-mass and parton-shower effects in ${W^+W^-}$ production