Light Hadron Spectroscopy on Coarse Lattices with O(a^2) Mean-Field Improved Actions

Abstract

The masses and dispersions of light hadrons are calculated in lattice QCD using an O(a^2) tadpole-improved gluon action and an O(a^2) tadpole-improved next-nearest-neighbor fermion action originally proposed by Hamber and Wu. Two lattices of constant volume with lattice spacings of approximately 0.40 fm and 0.24 fm are considered. The results reveal some scaling violations at the coarser lattice spacing on the order of 5%. At the finer lattice spacing, the calculated mass ratios reproduce state-of-the-art results using unimproved actions. Good dispersion and rotational invariance up to momenta of pa ~ 1 are also found. The relative merit of alternative choices for improvement operators is assessed through close comparisons with other plaquette-based tadpole-improved actions.

17 page RevTeX manuscript. 7 Figures. This and related papers may also be obtained from http://www.physics.adelaide.edu.au/~dleinweb/Publications.html

References in corpus (7)

• Efficient glueball simulations on anisotropic lattices
• Prospects for perfect actions
• Accurate Scale Determinations for the Wilson Gauge Action
• Scaling of Non-Perturbatively O(a) Improved Wilson Fermions: Hadron Spectrum, Quark Masses and Decay Constants
• Perturbative Improvement for Lattice QCD: An Update
• Mean-link tadpole improvement of SW and D234 actions
• Scaling Tests of Some Lattice Fermion Actions

Cited by in corpus (10)

• Infinite Volume and Continuum Limits of the Landau-Gauge Gluon Propagator
• Vector meson production and nucleon resonance analysis in a coupled-channel approach for energies m_N < sqrt(s) < 2 GeV I: pion-induced results and hadronic parameters
• Vector meson production and nucleon resonance analysis in a coupled-channel approach for energies m_N < sqrt(s) < 2 GeV II: photon-induced results
• Infrared Behavior of the Gluon Propagator on a Large Volume Lattice
• Testing the fixed-point QCD action and the construction of chiral currents
• Chiral Behaviour of the Rho Meson in Lattice QCD
• Scale setting and the light baryon spectrum in $N_f=2+1$ QCD with Wilson fermions
• General Algorithm For Improved Lattice Actions on Parallel Computing Architectures
• Charmed baryons from lattice QCD
• Hadron Properties with FLIC Fermions