Mr Peter Krachkov (BINP)
QED processes in the field of a heavy atom are important in different area such as atomic physics, high energy physics, astrophysics and others. These processes are describe interaction of charged particles and photons with matter. Bremsstrahlung and particle-antiparticle photoproduction in the electric field of a heavy nucleus or atom play a dominant role when considering electromagnetic showers in detectors.Because of this the accurate description of such processes are necessary for design of the detectors of charged particles. In this work the distinction between the charged particle and antiparticle differential cross sections of high-energy bremsstrahlung in the electric field of a heavy atom is investigated. The consideration is based on the quasiclassical approximation to the wave functions in the external field. The charge asymmetry (the ratio of the antisymmetric and symmetric parts of the differential cross section) arises due to the account for the first quasiclassical correction to the differential cross section. All evaluations are performed with the exact account of the atomic field. We consider in detail the charge asymmetry for electrons and muons. For the longitudinal polarization of the initial charged particle, the account for the first quasiclassical correction to the differential cross section leads to the asymmetry in the cross section with respect to the replacement $\varphi\rightarrow-\varphi$, where $\varphi$ is the azimuth angle between the photon momentum and the momentum of the final charged particle.