The spectrum of excited isovector mesons is studied using a 32^3 x 256 anisotropic lattice with u,d quark masses set to give a pion mass near 240 MeV. Results in the bosonic isovector nonstrange symmetry channels of zero total momentum are presented using correlation matrices of unprecedented size. In addition to spatially-extended single-meson operators, large numbers of 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.1410.8839,
title = {Excited isovector mesons using the stochastic LapH method},
author = {Colin Morningstar and Brendan Fahy and You-Cyuan Jhang and Keisuke J. Juge and David Lenkner and Chik Him Wong},
journal= {arXiv preprint arXiv:1410.8839},
year = {2014}
}
Comments
7 pages, 4 figures, contribution to the 32nd International Symposium on Lattice Field Theory (Lattice 2014), 23-28 June 2014, Columbia University, New York, NY, USA