Spectral density in the pseudoscalar and vector channels is extracted from the SU(2) lattice quenched data. It is shown to consist of three sharp poles within the energy range accessible on the lattice.
@article{arxiv.hep-lat/9511011,
title = {Spectral Density on the Lattice},
author = {D. Makovoz and G. A. Miller},
journal= {arXiv preprint arXiv:hep-lat/9511011},
year = {2009}
}