The equivalent photon approximation for lepto-production of neutrino pairs

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Abstract
Lepto-production of neutrino pairs by the nuclear Coulomb field has been suggested in the literature as a tool to look for the number of generations. The authors discuss the limitations of the equivalent photon approximation for the description of this process, in spite of the small four-momentum squared of the photon imposed by the nuclear form factor. Even at high incoming energies, the approximation is wrong for electrons by as much as 70%, predicting a wrong scale for the energy dependence of the cross section.