Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 4: Quanteneffekte: QED

Q 4.3: Talk

Monday, March 12, 2012, 11:00–11:15, V7.01

Nonlinear Double Compton Scattering in pulsed plane wave fields — •Felix Mackenroth and Antonino Di Piazza — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany

Nonlinear Double Compton Scattering (NDCS) is the emission of two photons by an electron scattered in a strong laser field [1] which cannot be accounted for perturbatively. In the framework of QED this process can occur with an off-shell (p²≠ m²) or on-shell electron between the two emissions. The former process has no classical analogue while in the latter case the process is split up into two incoherent Nonlinear Compton Scattering events. We show that by dropping the usual assumption of a monochromatic laser field, the dressed propagator of the intermediate electron naturally splits up into an on- and off-shell part and is finite without the need for ad-hoc regularization [2]. Furthermore recently a quantum treatment of radiation reaction was presented taking into account only incoherent photon emissions and neglecting the coherent processes [3]. By comparing the two contributions to NDCS we explore the validity of this approximation.

[1] E. Lötstedt and U.D. Jentschura, Phys. Rev. Lett. 103, 110404 (2009).
[2] F. Mackenroth and A. Di Piazza, in preparation.
[3] A. Di Piazza, K. Z. Hatsagortsyan and C. H. Keitel, Phys. Rev. Lett. 105, 220403 (2010).