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Journals and Conferences
We apply the Hybrid Monte Carlo Algorithm to pure gauge QCD and to QCD with 4 flavors of staggered dynamical fermions. We show how the acceptance in the global Metropolis step depends upon the parameters of the algorithm. By tuning the values of the coupling constants in the algorithm to be different from those in the global Metropolis step, we find that… (More)
This talk presents results of a comparitive study of iterative algorithms like minimal residue (M R) and conjugate gradient (CG, BiCGγ5, and BiCGstab) used for inverting the Dirac matrix M. The tests were done on the Connection Machine CM-5 using 32 3 × 64 lattices. The fermion action used is of Wilson type, both with and without the clover term. The… (More)
We present our latest results for the ∆I = 1/2 rule, obtained on quenched ensembles with β = 6.0 and 6.2, and a set of N f = 2 configurations with β = 5.7. The statistical noise is quite under control. We observe an enhancement of the ∆I = 1/2 amplitude consistent with experiment, although the systematic errors are still large. We also present a… (More)
We investigate the use of two types of non-local (\smeared") sources for quark propagators in quenched lattice QCD at = 6:0 using Wilson fermions at = 0:154 and 0:155. We present results for the hadron mass spectrum, meson decay constants, quark masses, the chiral condensate and the quark distribution amplitude of the pion. The use of smeared sources leads… (More)
We present results of a study of BK using tadpole improved gauge-invariant staggered operators. Using three ensembles of 16 3 × 32 configurations with varying numbers of dynamical flavors, we observe a small dependence on N f. Using 7 quenched ensembles at different values of β, we extrapolate to a = 0.
We present preliminary results of matrix elements of four fermion operators relevant to the determination of ǫ and ǫ ′ /ǫ using staggered fermions.
Last year, we reported our first results on the determination of Gasser–Leutwyler coefficients using partially quenched lattice QCD with three flavors of dynamical staggered quarks. We give an update on our progress in determining two of these coefficients, including an exhaustive effort to estimate all sources of systematic error. At this conference, we… (More)
We calculate the kaon B-parameter in quenched lattice QCD at β = 6.0 using Wil-son fermions at κ = 0.154 and 0.155. We use two kinds of non-local (" smeared ") sources for quark propagators to calculate the matrix elements between states of definite momentum. The use of smeared sources yields results with much smaller errors than obtained in previous… (More)
We review the status of lattice computer calculations in Quantum Chromo-dynamics (QCD) and mention a new field of computational high-energy physics—that of Strings or random surfaces. After outlining Monte Carlo Field Theory we explain in detail both QCD and Strings—describing how these theories are discretized on a lattice, what one can calculate, and how… (More)
We report on progress and future plans for calculating kaon weak matrix elements for ǫ ′ /ǫ using staggered fermions. The first goal of this project is to provide a check of the results (ǫ ′ /ǫ < 0) obtained using quenched Domain Wall fermions (DWF) by the CP-PACS  and RBC  collaborations. The second goal is to extend the work to dynami-cal… (More)