Quantum periodic cluster methods for strongly-correlated electron systems are reformulated and developed. The real lattice is divided into a superlattice of clusters. The reformulation and development are based on a canonical transformation, which periodizes the fermions in the cluster space. The dynamical cluster approximation and the cellular dyn...

Kniehl, B.A.Piclum, J.H.Steinhauser, M. (Hamburg Univ. (Germany)...Deutsches Elektronen-Synchrotron (DESY),...

We calculate the O (#alpha##alpha#_s) corrections to the relationships between the MS Yukawa couplings and the pole masses of the first five quark flavours in the standard model. We also present the corresponding relationships between the MS and pole masses, which emerge as by-products of our main analysis. The occurring self-energies are evaluated...

The effect of repeatedly smearing SU (3) gauge configurations is investigated. Six gauge actions (Wilson, Symanzik, Iwasaki, DBW2, Beinlich-Karsch-Laermann, Langfeld) and three smearing recipes (APE, HYP, EXP, the first two with and without projection) are compared. The impact on Wilson loops and the Creutz ratio is monitored as well as the ''naive...

univ., leipzigHorsley, R. (Edinburgh Univ. (United Kin...Deutsches Elektronen-Synchrotron (DESY),...Schiller, A. (Leipzig Univ. (Germany). I...Perlt, H. (Regensburg Univ. (Germany). I...Deutsches Elektronen-Synchrotron (DESY),...

We compute lattice renormalisation constants of local bilinear quark operators for overlap fermions and improved gauge actions. Among the actions we consider are the symanzik, luescher-weisz, iwasaki and DBW2 gauge actions. The results are given for a variety of #rho# parameters. We show how to apply mean field (tadpole) improvement to overlap ferm...