We perform a model study on the 2-flavor lattice Schwinger model using standard Wilson and O(a) improved Sheikholeslami-Wohlert (SW) action. We find, that the phase diagram is altered, the critical line shifted closer towards its continuum value κc=0.25. We find no improvement in the rotation invariance of meson propagators; the scaling of the Schwinger mass is considerably improved, high momentum states are not. The additional cost of ≈30 CPU-time is highly justified when calculating masses, but not for high momentum observables.
@article{arxiv.hep-lat/9807011,
title = {The lattice Schwinger model with the SW action},
author = {Ch. Hoelbling and C. B. Lang and R. Teppner},
journal= {arXiv preprint arXiv:hep-lat/9807011},
year = {2007}
}