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We discuss and compare the efficiency of various methods, combinations of point-to-all propagators, stochastic timeslice-to-all propagators, the one-end trick and sequential propagators, to compute two-point correlation functions of two-quark and four-quark interpolating operators of different structure including quark-antiquark type, mesonic molecule type,(More)
We compute the ratio Λ L /Λ M S between the scale parameter Λ L , associated with a lattice formulation of QCD using the overlap-Dirac operator, and Λ M S of the MS renormalization scheme. To this end, the necessary one-loop relation between the lattice coupling g 0 and the coupling renormalized in the MS scheme is calculated, using the lattice background(More)
We investigate Lüscher's method of including dynamical Wilson fermions in a lattice simulation of QCD with two quark flavours. We measure the accuracy of the approximation by comparing it with Hybrid Monte Carlo results for gauge plaquette and Wilson loops. We also introduce an additional global Metropolis step in the update. We show that the complexity of(More)
We compute the one-loop lattice renormalization of the two-quark operators ¯ ψΓψ, where Γ denotes the generic Dirac matrix, for the lattice formulation of QCD using the overlap-Dirac operator. We also study the renormalization of quark bilinears which are more extended and have better chiral properties. Finally, we present improved estimates of these(More)
Diquarks may play an important role in hadron spectroscopy, baryon decays, and color superconductivity. We investigate the existence of diquark correlations in lattice QCD by considering systematically all the lowest energy diquark channels in a color gauge-invariant setup. We measure mass differences between the various channels and show that the positive(More)
We study the gluon propagator on the lattice using the Laplacian gauge which is free of lattice Gribov copies. We compare our results with those obtained in the Landau gauge on the lattice, as well as with various approximate solutions of the Dyson Schwinger equations. We find a finite value ∼ (250MeV) −2 for the zero-momentum propagator, and a pole mass ∼(More)
1Goethe-Universität Frankfurt am Main, Institut für theoretische Physik, Max-von-Laue-Straße 1, D-60438 Frankfurt am Main, Germany 2Computation-based Science and Technology Research Center, The Cyprus Institute, 20 Kavafi Street, 2121 Nicosia, Cyprus 3Department of Physics, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus 4NIC, DESY, Platanenallee(More)
We show remnants of chiral symmetry breaking in the center-projected theory. We construct and study an unambiguous definition of center vortices. 1. Non-perturbative effects in the center-projected theory The standard approach to identify center vor-tices proceeds through gauge fixing. In [1], we fixed an SU (2) ensemble to Direct Maximal Center (DMC)(More)