Towards Highly Improved Quark Actions
Abstract
We describe two ideas useful in the construction of highly improved quark actions for simulations on coarse lattices: (i) Field transformations solve the doubler problem without destroying tree-level improvement for on- or off-shell quantities. The simplest example is the Sheikholeslami-Wohlert (clover) action. Going to the next order of improvement yields the class of D234 actions. (ii) Anisotropic lattices with at < as useful because they push up the energy of unphysical branches of the dispersion relation (which are generic to highly improved actions), allow accurate mass determinations for particles with bad signal/noise properties (glueballs, P-state mesons), and enable one to simulate heavy quarks within a relativistic framework. We present first simulation results for the quenched light hadron and charmonium spectra obtained with a D234 action on anisotropic lattices.
- Publication:
-
Nuclear Physics B Proceedings Supplements
- Pub Date:
- February 1997
- DOI:
- 10.1016/S0920-5632(96)00803-1
- arXiv:
- arXiv:hep-lat/9608113
- Bibcode:
- 1997NuPhS..53..861A
- Keywords:
-
- High Energy Physics - Lattice;
- High Energy Physics - Theory
- E-Print:
- Talks presented at LATTICE96(improvement), 6 pages, LaTeX, 2 eps files, espcrc2.sty (included)