Neutrino-induced heavy-lepton pair production at high energies and multimuon events

Total cross sections for the process ν_μ+⁵⁶Fe→μ^-+L⁺+L⁰+⁵⁶Fe have been calculated in conventional V-A weak-interaction theory. For multi-GeV/c² mass assignments for L⁺, the cross section is {~}10^-6 of the observed rate of charged-current events production by neutrinos at Fermilab. However, for m_L⁺=m_μ⁺, and m_L⁰~1 to 2 GeV/c², the cross section is {~}10^-1 of the reported trimuon rates. Allowing L⁰ to decay into muons + anything, we find that the leptons in the final states may be very energetic.