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High-energy e^+e^- photoproduction in the field of a heavy atom accompanied by bremsstrahlung
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High-energy e^+e^- photoproduction in the field of a heavy atom accompanied by bremsstrahlung
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Helicity amplitudes and differential cross section of high-energy $e^+e^-$ photoproduction accompanied by bremsstrahlung in the electric field of a heavy atom are derived. The results are exact in the nuclear charge number and obtained in the leading quasiclassical approximation. They correspond to the leading high-energy small-angle asymptotics of the amplitude. It is shown that, in general, the Coulomb corrections essentially modify the differential cross section as compared to the Born result. When the initial photon is circularly polarized the Coulomb corrections lead to the asymmetry in the distribution over the azimuth angles $\varphi_i$ of produced particles with respect to the replacement $\varphi_i\to -\varphi_i$.
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