S. Güsken

Non-singlet axial vector couplings of the baryon octet in lattice QCD*

We calculate in the quenched approximation the F and D parameters characterising the axial vector matrix elements of the baryon octet. The use of an improved fermion action and smeared interpolating fields enables us to go down in quark mass to the SU ( 3 ) symmetric point. Both the F/D ratio and g A are in good agreement with the experimental values within a statistical error of a≈10%.

A study of smearing techniques for hadron correlation functions

Abstract We present a systematic study of smearing techniques, applied to increase the overlap of Hadron operators with their ground states. We find that the relevant parameters of the different schemes can be optimized such that the Hadron propagators are dominated by the ground state at time separation t = 1 already.

Many Masses On One Stroke: Economic Computation Of Quark Propagators

The computational effort in the calculation of Wilson fermion quark propagators in Lattice Quantum Chromodynamics can be considerably reduced by exploiting the Wilson fermion matrix structure in inversion algorithms based on the non-symmetric Lanczos process. We consider two such methods: QMR (quasi minimal residual) and BCG (biconjugate gradients). Based on the decomposition M/κ = 1/κ−D of the Wilson mass matrix, using QMR, one can carry out inversions on a whole trajectory of masses simultaneously, merely at the computational expense of a single propagator computation. In other words, one has to compute the propagator corresponding to the lightest mass only, while all the heavier masses are given for free, at the price of extra storage. Moreover, the symmetry γ5M = M†γ5 can be used to cut the computational effort in QMR and BCG by a factor of two. We show that both methods then become — in the critical regime of small quark masses — competitive to BiCGStab and significantly better than the standard MR m...

Light and Strange Hadron Spectroscopy with Dynamical Wilson Fermions

We present the final analysis of the light and strange hadron spectra from a full QCD lattice simulation with two degenerate dynamical sea quark flavors at

The Pion nucleon sigma term with dynamical Wilson fermions

\ensuremath{\beta}=5.6

Light quark masses with dynamical Wilson fermions

on a

First evidence of Nf-dependence in the QCD interquark potential

{16}^{3}\ifmmode\times\else\texttimes\fi{}32

Mass-splittings in the baryon octet and the nucleon σ-term in lattice QCD☆

lattice. Four sets of sea quark masses corresponding to the range

alpha(S) from Upsilon spectroscopy with dynamical Wilson fermions

0.69l~{m}_{\ensuremath{\pi}}{/m}_{\ensuremath{\rho}}l~0.83

Evaluating sea quark contributions to flavour-singlet operators in lattice QCD

are investigated. For reference we also ran a quenched simulation at