Path-integral formulation of scattering theory

Authors

Paul Finkler, University of Nebraska-LincolnFollow
C. Edward Jones, University of Nebraska-Lincoln
M. Misheloff, University of Nebraska-Lincoln

Date of this Version

10-15-1975

Document Type

Article

Citation

Physical Review D, VOLUME 12, NUMBER 8, 15 OCTOBER 1975

Abstract

A new formulation of nonrelativistic scattering theory is developed which expresses the S matrix as a path integral. This formulation appears to have at least two advantages: (1) A closed formula is obtained for the S matrix in terms of the potential, not involving a series expansion; (2) the energy-conserving δ function can be explicitly extracted using a technique analogous to that of Faddeev and Popov, thereby yielding a closed pathintegral expression for the T matrix. The introduction of the concept of the classical interaction picture provides considerable physical insight into this formulation. This formulation also suggests a successionof improvements to the eikonal approximation, the first of which is discussed explicitly.