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arXiv · 2203.14776

Non-linear Breit-Wheeler pair production in collisions of bremsstrahlung $\gamma-$quanta and a tightly focussed laser pulse

Alina Golub·Selym Villalba-Chávez·Carsten Müller
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Abstract

Experimental efforts toward the detection of the nonperturbative strong-field regime of the Breit-Wheeler pair creation process plan to combine incoherent sources of GeV $\gamma$ quanta and the coherent fields of tightly focussed optical laser pulses. This endeavour calls for a theoretical understanding of how the pair yields depend on the applied laser field profile. We provide estimates for the number of produced pairs in a setup where the high-energy radiation is generated via bremsstrahlung. Attention is paid to the role of the transversal and longitudinal focussing of the laser field, along with the incorporation of a Gaussian pulse envelope. We compare our corresponding results with predictions from plane-wave models and determine the parameters of focused laser pulses which maximize the pair yield at fixed pulse energy. Besides, the impact of various super-Gaussian profiles for the laser pulse envelope and its transverse shape is discussed.

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Alina Golub, Selym Villalba-Chávez, Carsten Müller. 2022-03-28. Non-linear Breit-Wheeler pair production in collisions of bremsstrahlung $\gamma-$quanta and a tightly focussed laser pulse. https://doi.org/10.1103/physrevd.105.116016

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