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We calculate the bilinear combination of Dirac tensors describing thecreation of a pair of charged particle (pi-meson or leptons) by virtual photonsintegrated on the final particle phase volume. It can be interpreted as an schannel discontinuity of the zero angle light-by-light scattering tensor withboth photons off mass shell. The expression of light-by-light scattering tensoris represented in the form where the gauge invariance and the Bose symmetry areexplicitly shown. Some applications and the checks are discussed.

Imaginary part of the zero angle light-by-light scattering tensor