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Manuscript Title: A vectorized code for the Monte Carlo computation of spin-dependent
static potentials in QCD. | ||

Authors: M. Campostrini, K.J.M. Moriarty, C. Rebbi | ||

Program title: SPINSU3 | ||

Catalogue identifier: AALH_v1_0Distribution format: gz | ||

Journal reference: Comput. Phys. Commun. 42(1986)175 | ||

Programming language: Fortran. | ||

Computer: CDC CYBER 205, MODEL 682. | ||

Operating system: CDC CYBER 200 VSOS 2.1.6. | ||

RAM: 1600K words | ||

Word size: 64 | ||

Keywords: Particle physics, Elementary, Quantum chromodynamics, Lattice guage theory, Su(3) gauge theory, Spin-dependent forces, Monte carlo techniques, Vector processor. | ||

Classification: 11.5. | ||

Nature of problem:Spin-dependent forces between heavy quarks can be expressed in terms of vacuum expectation values of color electric and magnetic fields in the presence of a Wilson loop; their Monte Carlo computation requires the measurement of Wilson loops with two plaquette insertions on 'vertical' sides. | ||

Solution method:SU(3) gauge theory is simulated with a standard Monte Carlo technique, using the methods illustrated (Comp. Phys. Commun. 32(1984)1) to optimize the computation on a CDC CYBER 205. Loop measurements are performed efficiently by transforming the configuration into the temporal gauge; horizontal sides of every loop are computed with the "multi-hit" technique, to improve statistics. | ||

Restrictions:(a) Space lattice size NS must be even. (b) Fast memory requirements are: 55*LS*NS**3 words for version I, 30*LS**2*NS**3 words for version II, both with half-word precision arithmetic (LS = maximum separation of static quarks). (c) Temporary mass storage requirements are: 0.55*NS**3*NT (512 word) blocks for both versions (NT = temporal lattice size). | ||

Running time:One iteration (20 upgradings + 1 measurement) takes 1600 CPU seconds on a two pipe CYBER 205, for a 16**3*32 lattice and half-precision arithmetic. |

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