Ab initio QED treatment of the two-photon annihilation of positrons with bound electrons
arXiv:1903.02243 · doi:10.1103/PhysRevLett.123.093401
Abstract
The process of a positron $\unicode{x2013}$ bound-electron annihilation with simultaneous emission of two photons is investigated theoretically. A fully relativistic formalism based on QED description of the process is worked out. The developed approach is applied to evaluate the annihilation of a positron with -shell electrons of a silver atom, for which a strong contradiction between theory and experiment was previously stated. The results obtained here resolve this long-standing disagreement and, moreover, demonstrate a sizeable difference with approaches so far used for calculations of the positron $\unicode{x2013}$ bound-electron annihilation process, namely, the and approximations.
arXiv comment11 pages, 4 figures, 1 table, 46 references
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