Diagonal Kenney-Laub rational approximation to the overlap operator using Wilson and Brillouin kernels shows enhanced chiral symmetry preservation and efficiency over Chebyshev polynomials on quenched lattices.
Chiral symmetry and O(a) improvement in lattice QCD
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abstract
The dominant cutoff effects in lattice QCD with Wilson quarks are proportional to the lattice spacing a. In particular, the isovector axial current satisfies the PCAC relation only up to such effects. Following a suggestion of Symanzik, they can be cancelled by adding local O(a) correction terms to the action and the axial current. We here address a number of theoretical issues in connection with the O(a) improvement of lattice QCD and then show that chiral symmetry can be used to fix the coefficients multiplying the correction terms.
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hep-lat 2years
2026 2verdicts
UNVERDICTED 2representative citing papers
Non-perturbative renormalization constants for gluonic and fermionic components of the traceless energy-momentum tensor in Nf=3 lattice QCD are computed to few-percent accuracy using discretized Ward identities with shifted boundary conditions.
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Diagonal Kenney-Laub Rational Approximation to the Overlap Operator using Wilson and Brillouin Kernel
Diagonal Kenney-Laub rational approximation to the overlap operator using Wilson and Brillouin kernels shows enhanced chiral symmetry preservation and efficiency over Chebyshev polynomials on quenched lattices.
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The QCD energy-momentum tensor on the lattice: non-perturbative renormalization with $N_f=3$
Non-perturbative renormalization constants for gluonic and fermionic components of the traceless energy-momentum tensor in Nf=3 lattice QCD are computed to few-percent accuracy using discretized Ward identities with shifted boundary conditions.