arXiv:nucl-th/0208057·v1·Nuclear Theory
Quasiparticle Properties in Effective Field Theory
L. Platter (FZ Jülich)🇩🇪 · H.-W. Hammer (Ohio State U.)🇺🇸 · Ulf-G. Meißner (FZ Jülich and U. Graz)🇩🇪
Abstract
The quasiparticle concept is an important tool for the description of many-body systems. We study the quasiparticle properties for dilute Fermi systems with short-ranged, repulsive interactions using effective field theory. We calculate the proper self-energy contributions at order (K_f/Lambda)^3, where Lambda is the short-distance scale that sets the size of the effective range parameters and K_f the Fermi momentum. The quasiparticle energy, width, and effective mass to order O(K_f/Lambda)^3 are derived from the calculated self-energy.
Comments: 15 pages, revtex4, 4 PS figures