Electromagnetic muon-pair contibutions in neutrino trimuon production

The electromagnetic production of ${\mu }^{+}{\mu }^{-}$ pairs in charged-current neutrino scattering is calculated for a scaling parton model. This process gives trimuons at 0.4 × ${10}^{-4\mathrm{}}$ 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.