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Title: Effect of tree-level and mean-field improvement on the light-hadron spectrum in quenched QCD
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Keywords: Pure & Applied Mathematics
Issue Date: 1997
Publisher: American Physical Society
Citation: 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
Series/Report no.: Physical Review D
Abstract: 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
Description: PUBLISHED
ISSN: 0556-2821
Appears in Collections:Pure & Applied Mathematics (Scholarly Publications)

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