Progress in computing the spectrum of excited baryons and mesons in lattice QCD is described. Our first results in the zero-momentum bosonic I=1, S=0, T1u+ symmetry sector of QCD using a correlation matrix of 56 operators are presented. In addition to a dozen spatially-extended meson operators, 44 two-meson operators are used, involving a wide variety of light isovector, isoscalar, and strange meson operators of varying relative momenta. All needed Wick contractions are efficiently evaluated using a stochastic method of treating the low-lying modes of quark propagation that exploits Laplacian Heaviside quark-field smearing. Level identification is discussed.
@article{arxiv.1310.7887,
title = {Spectrum of excited states using the stochastic LapH method},
author = {John Bulava and Brendan Fahy and Justin Foley and You-Cyuan Jhang and Keisuke J. Juge and David Lenkner and Colin Morningstar and Chik Him Wong},
journal= {arXiv preprint arXiv:1310.7887},
year = {2013}
}
Comments
14 pages, 7 figures, talk and poster presented at the 31st International Symposium on Lattice Field Theory (Lattice 2013), 29 July - 3 August 2013, Mainz, Germany