We consider vacuum polarization effects in the one-photon annihilation channel within a kinetic description of the e − e + plasma produced from the vacuum in the focal spot of counter-propagating laser beams. This entails essential changes in the structure of the photon kinetic equation. We investigate the domain of large adiabaticity parameters γ ≫ 1 where the photon radiation turns out to be very small. A more thorough examination of the domain γ 1 needs separate investigation. However, an exploratory study has shown that the one-photon annihilation channel can lead for some domains of laser field parameters (e.g., for the XFEL) to contributions accessible for observation.

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