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Journal Article

#### Polarization-operator approach to pair creation in short laser pulses

##### MPS-Authors

##### Locator

http://dx.doi.org/10.1103/PhysRevD.91.013009

(Publisher version)

##### Fulltext (public)

1406.7235.pdf

(Preprint), 2MB

##### Supplementary Material (public)

There is no public supplementary material available

##### Citation

Meuren, S., Hatsagortsyan, K. Z., Keitel, C. H., & Di Piazza, A. (2015). Polarization-operator
approach to pair creation in short laser pulses.* Physical Review D,* *91*(1):
013009. doi:10.1103/PhysRevD.91.013009.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0025-0205-A

##### Abstract

Short-pulse effects are investigated for the nonlinear Breit-Wheeler process,
i.e. the production of an electron-positron pair induced by a gamma photon
inside an intense plane-wave laser pulse. To obtain the total pair-creation
probability we verify (to leading-order) the cutting rule for the polarization
operator in the realm of strong-field QED by an explicit calculation. Using a
double-integral representation for the leading-order contribution to the
polarization operator, compact expressions for the total pair-creation
probability inside an arbitrary plane-wave background field are derived.
Correspondingly, the photon wave function including leading-order radiative
corrections in the laser field is obtained via the Schwinger-Dyson equation in
the quasistatic approximation. Moreover, the influence of the carrier-envelope
phase and of the laser pulse shape on the total pair-creation probability in a
linearly polarized laser pulse is investigated, and the validity of the (local)
constant-crossed field approximation analyzed. It is shown that with presently
available technology pair-creation probabilities of the order of ten percent
could be reached for a single gamma photon.