Abstract
The assistance of an intense optical laser pulse on electron-positron pair production by the Breit-Wheeler and Schwinger processes in XFEL fields is analyzed. The impact of a laser beam on high-energy photon collisions with XFEL photons consists in a phase space redistribution of the pairs emerging in the Breit-Wheeler sub-process. We provide numerical examples of the differential cross section for parameters related to the European XFEL. Analogously, the Schwinger type pair production in pulsed fields with oscillating components referring to a superposition of optical laser and XFEL frequencies is evaluated. The residual phase space distribution of created pairs is sensitive to the pulse shape and may differ significantly from transiently achieved mode occupations.
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Notes
- 1.
\(p_\parallel \) is parallel to the laser plane and \(p_\perp \) perpendicular to it.
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Acknowledgments
R. Sauerbrey, T. E. Cowan and H. Takabe are gratefully acknowledged for the collaboration within the HIBEF project [33]. We thank S. Fritzsche and A. Surzhykov for the common work on the caustic interpretation of elementary QED processes in bi-frequent fields. D.B. and S.A.S have been supported by Narodowe Centrum Nauki under grant number UMO-2014/15/B/ST2/03752.
We dedicate this article to Walter Greiner on the occasion of his 80th birthday. Walter Greiner promoted essentially the in-depth exploration of the nature of the quantum vacuum.
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Nousch, T. et al. (2017). Laser Assisted Breit-Wheeler and Schwinger Processes. In: Schramm, S., Schäfer, M. (eds) New Horizons in Fundamental Physics. FIAS Interdisciplinary Science Series. Springer, Cham. https://doi.org/10.1007/978-3-319-44165-8_18
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