Shanahan, H. P., Davies, C. T. H., Bowler, K.C., Kenway, R. D., Richards, D. G., Rowland, P.A., Ryan, S. M., Lacock, P., Michael, C., Burford, D. R., Stella, N., Wittig, H. ‘Effect of tree-level and mean-field improvement on the light-hadron spectrum in quenched QCD’ in Physical Review D, 55, 1997, pp 1548 - 1558
Physical Review D 55
We compute the light-hadron mass spectrum at b55.7 using the O(a)-improved Sheikholeslami-Wohlert
fermion action with two choices of the clover coefficient: the classical value c51 and a mean-field or
tadpole-improved estimate c51.57. We compare our results with those of the GF11 Collaboration who use the
Wilson fermion action (c50). We find that changing c from zero to 1 and 1.57 leads to significant differences
in the masses of the chirally extrapolated and strange pseudoscalar and vector mesons, the nucleon, the D, and
also in the Edinburgh plot. A number of other quantities, for example, mV 2 2mP
2 , J, amK /amr , and
amK* /amr do not appear to change significantly. We also investigate the effect of changing the lattice volume
from approximately ~2 fm!3 to ~2.6 fm!3. We find that the meson masses are consistent to within one standard
deviation and baryon masses are consistent to within two standard deviations.
PACS number~s!: 12.38.Gc, 11.15.Ha, 14.65.Bt
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