One Particle (improper) states and Scattering States in Nelson's Massless Model
arXiv:math-ph/0010043
Abstract
In the one nucleon sector of Nelson's massless model with an ultraviolet cut-off and no infrared regularization, one particle improper states are constructed and a scattering theory is developed both for the massless scalar field and for the non-relativistic particle.
121 pages, 1 Postscript figure