From Faddeev–Kulish to LSZ. Towards a non-perturbative description of colliding electrons

Dybalski, Wojciech (Zentrum Mathematik, Technische Universität München, Germany) (Fakultät für Mathematik, Ludwig-Maximilians-Universität München, Germany)

27 October 2017

Abstract: In a low energy approximation of the massless Yukawa theory (Nelson model) we derive a Faddeev–Kulish type formula for the scattering matrix of N electrons and reformulate it in LSZ terms. To this end, we perform a decomposition of the infrared finite Dollard modifier into clouds of real and virtual photons, whose infrared divergencies mutually cancel. We point out that in the original work of Faddeev and Kulish the clouds of real photons are omitted, and consequently their wave-operators are ill-defined on the Fock space of free electrons. To support our observations, we compare our final LSZ expression for N=1 with a rigorous non-perturbative construction due to Pizzo. While our discussion contains some heuristic steps, they can be formulated as clear-cut mathematical conjectures.

Published in: Nuclear Physics B (2017)
Published by: Elsevier
DOI: 10.1016/j.nuclphysb.2017.10.018
License: CC-BY-3.0

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