Cutoff effects in meson spectral functions
T. Blum, P. Petreczky
TL;DR
This paper investigates how the lattice spacing affects meson spectral functions in quenched QCD, finding that at sufficiently fine lattice spacings, excited states are artifacts rather than physical features.
Contribution
It provides a comparative analysis of spectral functions using domain wall and clover Wilson fermions, clarifying the lattice artifact effects at different spacings.
Findings
Excited states are lattice artifacts for a ≤ 3 GeV lattice spacing.
Spectral functions become reliable for physical interpretation at fine lattice spacings.
The study guides future lattice QCD simulations to choose appropriate lattice spacings.
Abstract
We study the lattice spacing dependence of meson spectral functions calculated in quenched QCD with domain wall fermions as well as clover Wilson fermions in quenched and partially-quenched QCD. We conclude that for lattice spacing GeV all excited states appearing in the spectral functions are lattice artifacts.
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