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Structure of radiative corrections in a strong constant crossed field in the bubble-chain approximation
A. A. Mironov, A. M. Fedotov
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We present a calculation of the electron mass operator combining the bubble-chain photon and the leading order electron propagators in a strong constant crossed electromagnetic field. The photon propagator is obtained by a summation of the Dyson series over 1PI polarization loop insertions and is accounted for in general form. By applying the derived mass operator, we find the bubble-chain electron propagator and the elastic scattering amplitude. The results are expressed in the general form of expansion over γ-matrix structures, each multiplied by a scalar invariant function of the electron virtuality and the quantum dynamical parameter χ. We perform their asymptotic analysis and identify the dominant contribution at χ≫1. The presented calculations can be generalized by replacing the leading order electron propagator with the bubble-chain one. This will allow a consistent study the Dyson-Schwinger equations in the fully nonperturbative regime αχ^(2/3)≳1 within the bubble-chain approximation. In addition, we accompany our paper with the open-access computer-algebraic scripts containing all the presented computations [https://github.com/ArsenyMironov/SFQED-Loops].
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