Excited states in lattice QCD with the stochastic LapH method

¹ School of Mathematics, Trinity College, Dublin 2, Ireland
² Dept. of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA
³ Dept. of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112, USA
⁴ High Energy Accelerator Research Organization (KEK), Ibaraki 305-0801, Japan
⁵ Dept. of Physics, University of the Pacific, Stockton, CA 95211, USA
⁶ Dept. of Physics, University of California San Diego, La Jolla, CA 92093, USA

Published online: 9 June 2014

Abstract

Progress in computing the spectrum of excited baryons and mesons in lattice QCD is described. Results in the zero-momentum bosonic I = 1/2, S = 1, T_1u symmetry sector of QCD using a correlation matrix of 58 operators are presented. 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 using probe operators is discussed.