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It is well known that in the presence of strong external electromagneticfields many processes forbidden in standard QED become possible. One example isthe one-photon annihilation process considered recently by the present authorsin the framework of a kinetic approach to the quasiparticle e-e+ gamma plasmacreated from vacuum in the focal spot of two counter-propagating laser beams.In these works the domain of large values of the adiabaticity parameter gamma>> 1 (corresponding to multiphoton processes) was considered. In the presentwork we estimate the intensity of the radiation stemming from photonannihilation in the framework of the effective mass model where gamma < 1,corresponding to large electric fields E < E_c=m^2/e and high laser fieldfrequencies (the domain characteristic for X-ray lasers of the nextgeneration). Under such limiting conditions the resulting effect issufficiently large to be accessible to experimental observation.

Investigating the one-photon annihilation channel in an e-e+ plasma created from vacuum in strong laser fields