Quasiparticle Properties in Effective Field Theory

Details Quasiparticle Properties in Effective Field Theory Quasiparticle Properties in Effective Field Theory

2002-08-27

arxiv.org/abs/nucl-th/0208057v1

Nucl.Phys. A714 (2003) 250-264

Physics

Nuclear Physics

Nuclear Theory

15 pages, revtex4, 4 PS figures

Scientific paper

10.1016/S0375-9474(02)01365-9

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.

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