Effect of tree-level and mean-field improvement on the light-hadron spectrum in quenched QCD

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Physical Review, D

OSTI ID:450556

We compute the light-hadron mass spectrum at {beta}=5.7 using the O(a)-improved Sheikholeslami-Wohlert fermion action with two choices of the clover coefficient: the classical value c=1 and a mean-field or tadpole-improved estimate c=1.57. We compare our results with those of the GF11 Collaboration who use the Wilson fermion action (c=0). 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 {Delta}, and also in the Edinburgh plot. A number of other quantities, for example, m{sub V}{sup 2}{minus}m{sub P}{sup 2}, J, am{sub K}/am{sub {rho}}, and am{sub K{sup {asterisk}}}/am{sub {rho}} do not appear to change significantly. We also investigate the effect of changing the lattice volume from approximately (2 fm){sup 3} to (2.6 fm){sup 3}. We find that the meson masses are consistent to within one standard deviation and baryon masses are consistent to within two standard deviations. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 450556
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 3 Vol. 55; ISSN 0556-2821; ISSN PRVDAQ
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CHIRAL SYMMETRY
DELTA BARYONS
FERMIONS
HADRONS
LATTICE FIELD THEORY
MASS SPECTRA
MEAN-FIELD THEORY
MESONS
NUCLEONS
O GROUPS
QUANTUM CHROMODYNAMICS
VECTOR MESONS