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

Abstract

We calculate the process $pp\to W^{+}{W}^{-}\to e^{+}{\nu }_e{\mu }^{-}{\bar{\nu }}_{\mu }$ at NLO QCD, including also effective field theory (EFT) operators mediating the $gg{W}^{+}{W}^{-}$ interaction, which first occur at dimension eight. We further combine the NLO and EFT matrix elements produced by GoSam with the HERWIG7/MATCHBOX framework, which offers the possibility to study the impact of a parton shower. We assess the effects of the anomalous couplings by comparing them to top-mass effects as well as uncertainties related to variations of the renormalisation, factorisation and hard shower scales.

Comments: 24 pages, 16 figures