170 citations · 3.6k across the 120 of their papers we have counts for
11 papers · 2 filters
Excited nucleon spectrum using a non-perturbatively improved clover fermion action
LHPC Collaboration, D. G. Richards, QCDSF Collaboration +8
We discuss the extraction of negative-parity baryon masses from lattice QCD calculations. The mass of the lowest-lying negative-parity state is computed in quenched l…
The strong coupling constant from lattice QCD with N_f=2 dynamical quarks
S. Booth, M. Göckeler, R. Horsley +8
We compute for two flavors of light dynamical quarks using non-perturbatively improved Wilson fermions. We improve on a recent calculation by employing Padé-i…
Progress towards a lattice determination of (moments of) nucleon structure functions
S. Capitani, M. Gockeler, R. Horsley +4
Using unimproved and non-perturbatively O(a) improved Wilson fermions, results are given for the three lowest moments of unpolarised nucleon structure functions. Renormalisation, c…
Chirally improved Dirac operators: Studying the sensitivity to topological excitations for zero and finite temperature
Christof Gattringer, Meinulf Göckeler, C. B. Lang +3
We discuss the construction and properties of an approximate solution of the Ginsparg-Wilson equation, the so-called chirally improved lattice Dirac operator. In particular we stud…
Comparing lattice Dirac operators in smooth instanton backgrounds
Christof Gattringer, Meinulf Göckeler, C. B. Lang +2
We compare the behavior of different lattice Dirac operators in gauge backgrounds which are lattice discretizations of a classical instanton. In particular we analyze the standard…
Properties of near-zero modes and chiral symmetry breaking
Christof Gattringer, Meinulf Goeckeler, P. E. L. Rakow +2
We study localization and chirality properties of eigenvectors of the lattice Dirac operator. In particular we focus on the dependence of our observables on the size of the corresp…
Negative-parity Baryon Masses using an O(a)-improved Fermion Action
LHPC Collaboration, QCDSF Collaboration, UKQCD Collaboration +7
We present a calculation of the mass of the lowest-lying negative-parity J=1/2- state in quenched QCD. Results are obtained using a non-perturbatively O(a)-improved clover fermion…
A comprehensive picture of topological excitations in finite temperature lattice QCD
Christof Gattringer, Meinulf Göckeler, P. E. L. Rakow +2
We study spectra, localization properties and local chirality of eigenvectors of the lattice Dirac operator. We analyze ensembles of quenched SU(3) configurations on both sides of…
A lattice evaluation of four-quark operators in the nucleon
M. Göckeler, R. Horsley, B. Klaus +5
Nucleon matrix elements of various four-quark operators are evaluated in quenched lattice QCD using Wilson fermions. Some of these operators give rise to twist-four contributions t…
Calorons and localization of quark eigenvectors in lattice QCD
M. Göckeler, P. E. L. Rakow, A. Schäfer +2
We analyze the localization properties for eigenvectors of the Dirac operator in quenched lattice QCD in the vicinity of the deconfinement phase transition. Studying the characteri…
Determination of from quenched and dynamical QCD
S. Booth, M. Göckeler, R. Horsley +8
The scale parameter is computed on the lattice in the quenched approximation and for flavors of light dynamical quarks. The dynamical calculation is d…