These processes represent the production of a W boson which subsequently decays leptonically, in association with two real photons. Since this process includes real photons, the cross section diverges when the photon is very soft or in the direction of the beam. Thus in order to produce sensible results, the input file must supply values for both gammptmin and gammrapmax. Moreover, when the parameters zerowidth and removebr are set to .false. the decay W → ℓν will include photon radiation from the lepton, so that a non-zero R(photon,lept)_min should also be supplied. This will ensure that the cross section is well-defined.
These processes may be computed at leading order only.
nplotter_VHgaga.f is the default plotting routine.