Electromagnetic muon-pair contributions in neutrino trimuon production

The electromagnetic production of ..mu../sup +/..mu../sup -/ pairs in charged-current neutrino scattering is calculated for a scaling parton model. This process gives trimuons at 0.4 x 10/sup -/4 of the single-muon rate at 200 GeV. Energy and invariant-mass distributions for radiative trimuons are presented and characteristic features of azimuthal correlations are discussed.