https://doi.org/10.1140/epjd/s10053-025-00981-4
Regular Article - Optical Phenomena and Photonics
Note on Klein–Nishina effect in strong-field QED: the case of nonlinear Compton scattering
1
Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
2
Helmholtz-Zentrum Dresden-Rossendorf, Center for Advanced Systems Understanding (CASUS), Untermarkt 20, 02826, Görlitz, Germany
3
Institut für Theoretische Physik, TU Dresden, 01062, Dresden, Germany
Received:
19
November
2024
Accepted:
10
March
2025
Published online:
15
April
2025
Suitably normalized differential probabilities of one-photon emission in external electromagnetic fields are compared to quantify the transit of nonlinear Compton scattering to linear Compton scattering, described by the Klein–Nishina formula, and to constant-crossed field treatment. The known Klein–Nishina suppression at large energies is further enforced by increasing field intensity. In view of the Ritus–Narozhny conjecture, we demonstrate that different paths in the field intensity versus energy plane toward large values of the quantum nonlinearity parameter 
facilitate significantly different asymptotic dependencies, both in the Klein–Nishina regime and the constant-crossed field regime and in between.
© The Author(s) 2025
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