ar X iv : h ep - l at / 9 90 90 67 v 1 9 S ep 1 99 9 1

ar X iv : h ep - l at / 9 90 90 36 v 1 7 S ep 1 99 9 1 Flavour - singlet pseudoscalar and scalar mesons

We measure correlations appropriate for favour-singlet mesons using dynamical quark configurations from UKQCD. Improved methods of evaluating the disconnected quark diagrams are presented. The scalar and pseu-doscalar meson channels are explored, with special reference to the mixing of scalar mesons with scalar glueballs.

ar X iv : h ep - l at / 9 70 90 10 v 1 5 S ep 1 99 7 1 HUPD - 9715 NRQCD Results on Form Factors ∗

We report results on fB and semi-leptonic B decay form factors using NRQCD. We investigate 1/M scaling behavior of decay amplitudes. For fB Effect of higher order relativistic correction terms are also studied.

ar X iv : h ep - l at / 9 90 90 26 v 1 3 S ep 1 99 9 1 Chiral symmetry breaking from Ginsparg - Wilson fermions ∗

We calculate the large-volume and small-mass dependences of the quark condensate in quenched QCD using Neuberger's operator. We find good agreement with the predictions of quenched chiral perturbation theory, enabling a determination of the chiral lagrangian parameter Σ, up to a multiplicative renormalization.

ar X iv : h ep - l at / 9 90 60 02 v 1 1 J un 1 99 9 Exploring the π + – π + Interaction in Lattice QCD

ar X iv : h ep - l at / 9 60 90 13 v 1 3 S ep 1 99 6 1

We present an exact local bosonic algorithm for the simulation of dynamical fermions in lattice QCD. We show that this algorithm is a viable alternative to the Hybrid Monte Carlo algorithm.