It is shown how on-shell O(a) improvement can be implemented non-perturbatively in lattice QCD with Wilson quarks. Improvement conditions are obtained by requiring the PCAC relation to hold exactly in certain matrix elements. These are derived from the QCD Schr\"odinger functional which enables us to simulate directly at vanishing quark masses. In the quenched approximation and for bare couplings in the range 0≤g0≤1, we determine the improved action, the improved axial current, the additive renormalization of the quark mass and the isospin current normalization constants Z_A and Z_V.
@article{arxiv.hep-lat/9608049,
title = {Some new results in O(a) improved lattice QCD},
author = {M. Lüscher and S. Sint and R. Sommer and P. Weisz and H. Wittig and U. Wolff},
journal= {arXiv preprint arXiv:hep-lat/9608049},
year = {2009}
}
Comments
Talks presented at LATTICE96(improvement), 9 LaTeX pages plus 5 postscript figures, espcrc2.sty (included)