Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 53: Ultrashort laser pulses III

Q 53.6: Talk

Thursday, March 20, 2014, 17:45–18:00, DO26 207

Second order QED tree-level processes in pulsed plane wave fields — •Felix Mackenroth and Antonino Di Piazza — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany

Second order tree-level processes in dressed state QED can occur with either an off-shell (p²≠ m²) or on-shell particle connecting the two vertices. We show for the study of an intermediate electron propagator that by dropping the usual assumption of a monochromatic scattering laser field, the laser dressed propagator naturally splits up into an on- and off-shell part and is finite without the need for ad-hoc regularization [1]. We relate this study of two-photon emission to a recently proposed quantum picture of radiation reaction in the so-called ultra-relativistic, moderately quantum regime interpreting it as the incoherent emission of several photons [2]. We corroborate this latter picture by identifying quantum radiation patterns typical of radiation reaction. Finally we comment on the possibility of treating processes involving a photon instead of an electron propagator.

[1] D. Seipt, B. Kämpfer, Phys. Rev. D 85, 101701 (2012), F. Mackenroth, A. Di Piazza, Phys. Rev. Lett. 110, 070402 (2013).
[2] A. Di Piazza, K. Z. Hatsagortsyan and C. H. Keitel, Phys. Rev. Lett. 105, 220403 (2010).