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Manuscript Title: PiN: Computation of pion-nucleon scattering and bound states with the color dielectric quark model.
Authors: D. Lu, G. He, R.H. Landau
Program title: PiN
Catalogue identifier: ADHA_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 108(1998)75
Programming language: Fortran.
Computer: IBM RS6000/320.
Operating system: UNIX.
RAM: 1.7M words
Keywords: Particle physics, Elementary, Phenomenological model, Lippmann-schwinger, Equation, Baryons, Mesons, Quarks, Bound states, Scattering, Integral equations.
Classification: 11.6.

Nature of problem:
The subatomic interactions between mesons and baryons is believed to arise from the interaction between the quarks and gluons contained within the particles. This difficult many-body field theory problem is modeled by considering only the baryons as bound states of quarks, and by treating the mesons as elementary fields. The gluon degrees of freedom are averaged out of the theory, resulting in an effective color dielectric field which binds the quarks within the baryons. The scattering and bound states of the meson-baryon system supported by this model are computed.

Solution method:
Conversion of integral equations to linear (matrix) equations; removal of singularity with explicit subtraction; solution of matrix equations using scientific library routines.

Restrictions:
Up to P partial waves.

Running time:
15s (IBM/RS6000, 43P), 68s (SUN/SPARC 4) for test run (one energy); a 1000 such runs may be needed for a 3-D visualization.