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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:59 |
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Conference: Bucharest University Faculty of Physics 2018 Meeting
Section: Theoretical Physics and Applied Mathematics
Title:
Efficient Computation of the Trident Pair Production Spectra in Long Pulsed Plane-Wave Laser Fields
Authors:
Victor DINU (1)
Affiliation:
1) University of Bucharest, Physics
E-mail
victordinu@yahoo.com
Keywords:
strong laser, trident, nonlinear QED, pair production, quantum coherence
Abstract:
Trident pair production is considered in a pulsed plane-wave laser field. It is studied using the lightfront formalism and analytically integrating away transverse momenta. The division of the propagator into two lightfront instantaneous / non-instantaneous terms and the exchange of identical particles lead to the appearance of six terms, with different structures. They all contribute to what is known as a one-step process, but only one of them corresponds, in part, to the so-called two-step process. For a large intensity parameter a0, or for a long pulse, the latter dominates the former process. We developed an efficient method to compute the spectrum produced by a long laser pulse in the coherent, nonperturbative regime of a0 around unity. The differences between circular and linear polarisation are made manifest, the more complex structure evidenced in the latter case being related to the oscillations in the effective mass.
References:
V. I. Ritus, "Vacuum polarization correction to elastic electron and muon scattering in an intense field and pair electro- and muoproduction," Nucl. Phys. B 44 (1972) 236. doi:10.1016/0550-3213(72)90282-9
H. Hu, C. Müller and C. H. Keitel, "Complete QED theory of multiphoton trident pair production in strong laser fields," Phys. Rev. Lett. 105 (2010) 080401
A. Ilderton, "Trident pair production in strong laser pulses," Phys. Rev. Lett. 106 (2011) 020404
A. Di Piazza, C. Müller, K. Z. Hatsagortsyan and C. H. Keitel, "Extremely high-intensity laser interactions with fundamental quantum systems," Rev. Mod. Phys. 84 (2012) 1177 doi:10.1103/RevModPhys.84.1177
B. King and H. Ruhl, "Trident pair production in a constant crossed field," Phys. Rev. D 88 (2013) 1, 013005
V. Dinu, T. Heinzl, A. Ilderton, M. Marklund and G. Torgrimsson, "Vacuum refractive indices and helicity flip in strong-field QED," Phys. Rev. D 89 (2014) no.12, 125003
V. Dinu and G. Torgrimsson, "Trident pair production in plane waves: Coherence, exchange, and spacetime inhomogeneity," Phys. Rev. D 97, no. 3, 036021 (2018)
Acknowledgement:
The results presented arose from an ingoing collaboration with Greger Torgrimsson, currently a Humboldt fellow at Jena University
V. Dinu is supported by the CNCS-UEFISCDI project PN-III-P4-ID-PCE-2016-0792
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