Electromagnetic cascade evolution in the collision of two-color ultra-intense laser pulses

We consider the collision of laser pulses with Petawatt intensities, and study the statistics of the electron-positron-photon jets which arise due to strong-field QED effects. The nonlinear dynamics of the seeded electrons in the field is analysed, and analytical estimates are derived for the angular spectra/widths of the emitted jets. It turns out that varying the amplitude and frequency ratio of the laser pulses can help control these jet properties. These results are verified with three-dimensional Monte-Carlo and two-dimensional particle-in-cell simulations. It is shown that they could potentially be helpful in distinguishing between products borne out of cascades, and fermions formed due to Schwinger decay of the vacuum.