Linear Breit-Wheeler pair production by high-energy bremsstrahlung photons colliding with an intense X-ray laser pulse

TL;DR

This paper theoretically investigates a feasible experimental setup for observing linear Breit-Wheeler pair production by colliding high-energy bremsstrahlung photons with intense X-ray laser pulses, highlighting optimal conditions for detection.

Contribution

It proposes a novel experimental configuration combining bremsstrahlung and X-ray laser photons to enable the first observation of linear Breit-Wheeler pair creation.

Findings

Pair yields depend on electron energy, target thickness, laser parameters, and collision geometry.

Under current X-ray laser capabilities, the number of produced pairs is detectable.

The setup is feasible for experimental verification at existing facilities.

Abstract

A possible setup for the experimental verification of linear Breit-Wheeler pair creation of electrons and positrons in photon-photon collisions is studied theoretically. It combines highly energetic bremsstrahlung photons, which are assumed to be generated by an incident beam of GeV electrons penetrating through a high-$Z$ target, with keV photons from an X-ray laser field, which is described as a focused Gaussian pulse. We discuss the dependencies of the pair yields on the incident electron energy, target thickness, laser parameters, and collision geometry. It is shown that, for suitable conditions which are nowadays in reach at X-ray laser facilities, the resulting number of created particles seems to be well accessible for enabling the first experimental observation of the linear Breit-Wheeler process $\gamma\gamma\to e^+e^-$.