Symmetry, Superconvergence, and Sum Rules for Spectral Functions
Phys. Rev. Lett. 18, 761 – Published 1 May, 1967
DOI: https://doi.org/10.1103/PhysRevLett.18.761
Abstract
We discuss the convergence and the superconvergence properties of the invariant amplitudes which occur in suitable combinations of the propagator functions of the vector and the axial-vector currents, based on the use of symmetry arguments for the asymptotic behavior. The sum rules so obtained for the spectral functions are in good agreement with experiment.