Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/11165
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Type: Journal article
Title: Nonperturbative improvement and tree-level correction of the quark propagator
Author: Skullerud, J.
Leinweber, D.
Williams, A.
Citation: Physical Review. D. Particles, Fields, Gravitation and Cosmology, 2001; 64(7):074508-1-074508-9
Publisher: American Physical Soc
Issue Date: 2001
ISSN: 1550-7998
0556-2821
Statement of
Responsibility: 
Jonivar Skullerud, Derek B. Leinweber and Anthony G. Williams
Abstract: We extend an earlier study of the Landau gauge quark propagator in quenched QCD where we used two forms of the O(a)-improved propagator with the Sheikholeslami-Wohlert quark action. In the present study we use the nonperturbative value for the clover coefficient csw and mean-field improvement coefficients in our improved quark propagators. We compare this with our earlier results which used the mean-field csw and tree-level improvement coefficients for the propagator. We also compare three different implementations of tree-level correction: additive, multiplicative, and hybrid. We show that the hybrid approach is the most robust and reliable and can successfully deal even with strong ultraviolet behavior and zero crossing of the lattice tree-level expression. We find good agreement between our improved quark propagators when using the appropriate nonperturbative improvement coefficients and hybrid tree-level correction. We also present a simple extrapolation of the quark mass function to the chiral limit.
Rights: ©2001 The American Physical Society
RMID: 0020010445
DOI: 10.1103/PhysRevD.64.074508
Appears in Collections:Special Research Centre for the Subatomic Structure of Matter publications

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