The linear delta expansion is applied to a calculation of the SU(2) mass gap on the lattice. Our results compare favourably with the strong-coupling expansion and are in good agreement with recent Monte Carlo estimates.
@article{arxiv.hep-ph/9405311,
title = {Extended Variational Approach to the SU(2) Mass Gap on the Lattice},
author = {J. O. Akeyo and H. F. Jones and C. S. Parker},
journal= {arXiv preprint arXiv:hep-ph/9405311},
year = {2009}
}