Charge asymmetry in the differential cross section of high-energy e+e- photoproduction in the field of a heavy atom

Abstract

First quasiclassical correction to the differential cross section of high-energy electron-positron photoproduction in the electric field of a heavy atom is obtained with the exact account of the field. This correction is responsible for the charge asymmetry $\mathcal{A}$ in this process. When the transverse momentum of at least one of the produced particles is much larger than the electron mass $m$, the charge asymmetry can be as large as tens percent. We also estimate the contribution $\tilde{\mathcal{A}}$ to the charge asymmetry coming from the Compton-type diagram. For heavy nuclei, this contribution is negligible. For light nuclei, $\tilde{\mathcal{A}}$ is noticeable only when the angle between the momenta of electron and positron is of order of $m/\omega$ ($\omega$ is the photon energy) while the transverse momenta of both particles are much larger than $m$.

19 pages, 7 figures

References in corpus (1)

• High-energy $e^{+}{e}^{-}$ photoproduction cross section close to the end of spectrum

Cited by in corpus (7)

• Charge asymmetry in the differential cross section of high-energy bremsstrahlung in the field of a heavy atom
• Charge asymmetry in high-energy ${\mu }^{+}{\mu }^{-}$ photoproduction in the electric field of a heavy atom
• High-energy $e^{+}{e}^{-}$ photoproduction in the field of a heavy atom accompanied by bremsstrahlung
• High-energy electroproduction in an atomic field
• Small-angle scattering and quasiclassical approximation beyond leading order
• Double bremsstrahlung from high-energy electron in the atomic field
• Charge asymmetry in the spectra of bremsstrahlung and pair production