Quasiparticle Properties in Effective Field Theory
  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. 
L. Platter (FZ J\"ulich), H.-W. Hammer (Ohio State U.), Ulf-G.   Mei{\ss}ner (FZ J\"ulich and U. Graz)