Dimuon production by neutrinos: Test of weak-current models

We compare predictions of weak-current models for μ⁺μ^- production initiated by ν and ν with experimental x, y, p, and v distributions of the muon associated with the incident neutrino. These distributions indicate that νN dimuon production occurs dominantly off valence quarks, with a y dependence that is somewhat suggestive of (1-y)², while νN production occurs from sea quarks. Nevertheless, the original charm model provides a viable explanation within the uncertainties of present data. An improved description of the νN dimuon distributions is obtained with a $V+A$ charm-changing current. The dimuon data do not exhibit the characteristics expected from the production of the b-type quark of vectorlike theories. A vector-meson-dominance interpretation does not predict satisfactory x dependences.