# Towards Highly Improved Quark Actions

## TL;DR

This paper introduces two innovative methods for constructing highly improved quark actions on coarse lattices, including field transformations and anisotropic lattices, demonstrating promising simulation results for hadron spectra.

## Contribution

It presents novel techniques for quark action improvement that address the doubler problem and utilize anisotropic lattices, enhancing simulation accuracy on coarse grids.

## Key findings

- Successful implementation of D234 action on anisotropic lattices
- First simulation results for light hadron and charmonium spectra
- Potential for improved accuracy in lattice QCD simulations

## Abstract

We describe two ideas useful in the construction of highly improved quark actions for simulations on coarse lattices: (1) Field transformations to solve the doubler problem without destroying tree-level improvement for on- or off-shell quantities. (2) Anisotropic lattices with smaller temporal than spatial lattice spacing. We present first simulation results for the quenched light hadron and charmonium spectra obtained with a D234 action on anisotropic lattices.