Rise and fall of laser-intensity effects in spectrally resolved Compton process

The spectrally resolved differential cross section of Compton scattering, $d \sigma / d \omega’ \vert_{\omega’ = const}$, rises from small towards larger laser intensity parameter $\xi$, reaches a maximum, and falls towards the asymptotic strong-field region. Expressed by invariant quantities: $d \sigma /du \vert_{u = const}$risesfromsmalltowardslargervaluesof$\xi$, reaches a maximum at ${\xi }_{max}=\frac{4}{9}\mathcal{K}u{m}^2\mathrm{/}k\cdot p$, ${\cal K} = {\cal O} (1)$,andfallsat$\xi > \xi_{max}$like$\propto \xi^{-3/2} \exp \left (- \frac{2 u m^2}{3 \xi , k \cdot p} \right )$at$u \ge 1$. [The quantity $u$ is the Ritus variable related to the light-front momentum-fraction $s=(1+u)\mathrm{/}u=k\cdot k^{\mathrm{\prime }}\mathrm{/}k\cdot p$ of the emitted photon (four-momentum $k^{\mathrm{\prime }}$, frequency ${\omega }^{\mathrm{\prime }}$), and $k\cdot p\mathrm{/}{m}^2$ quantifies the invariant energy in the entrance channel of electron (four-momentum $p$, mass $m$) and laser (four-wave vector $k$).] Such a behavior of a differential observable is to be contrasted with the laser intensity dependence of the total probability, $\lim_{\chi = \xi k \cdot p/m^2, \xi \to \infty} $\mathbb{P}$ \propto \alpha \chi^{2/3} m^2 / k \cdot p$, which is governed by the soft spectral part. We combine the hard-photon yield from Compton with the seeded Breit-Wheeler pair production in a folding model and obtain a rapidly increasing $e^{+}{e}^{-}$ pair number at $\xi \lesssim 4$. Laser bandwidth effects are quantified in the weak-field limit of the related trident pair production.