Comparison of Lattice and Chiral Perturbation Theory calculations of pion scattering lengths

Abstract

I compare the lattice calculation of Fukugita et al. for the pion S-wave scattering lengths to the predictions of Chiral Perturbation Theory to two loop accuracy. I find good agreement, despite the use of the quenched approximation in the lattice calculation.

Comments: Plain Latex, 7 pages, 2 figures