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We discuss the work of the QCDSP collaboration to build an inexpensive Teraflop scale massively parallel computer suitable for computations in Quantum Chromodynamics (QCD). The computer is a collection of nodes connected in a four dimensional toroidial grid with nearest neighbor bit serial communications. A node is composed of a Texas Instruments Digital… (More)
The Quantum Chromodynamics on Digital Signal Processors ( <i>QCDSP</i>) machines in operation at Columbia University and nearly complete at the RIKEN Brookhaven Research Center are MIMD machines with processing nodes based on the Texas Instruments TMS320C31-50 digital signal processor (DSP), interconnected as a four-dimensional torus. The Columbia machine… (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 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 present preliminary results of matrix elements of four fermion operators relevant to the determination of ǫ and ǫ ′ /ǫ using staggered fermions.
We investigate the use of two kinds of staggered fermion operators, smeared and unsmeared. The smeared operators extend over a 4 4 hypercube, and tend to have smaller perturbative corrections than the corresponding unsmeared operators. We use these operators to calculate kaon weak matrix elements on quenched ensembles at β = 6.0, 6.2 and 6.4. Extrapolating… (More)
We extend a systematic renormalization procedure for quantum field theory to include particle masses and present several applications. We use a Hamiltonian formulation and light-front quantization because this may produce a convergent Fock-space expansion. The QCD Hamiltonian is systematically renormalized to second order in the strong coupling and the… (More)
SFI Working Papers contain accounts of scientific work of the author(s) and do not necessarily represent the views of the Santa Fe Institute. We accept papers intended for publication in peer-reviewed journals or proceedings volumes, but not papers that have already appeared in print. Except for papers by our external faculty, papers must be based on work… (More)