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Manuscript Title: Multiquark calculations with SCHOONSCHIP.
Authors: J. Wroldsen
Program title: MULTIQUARK
Catalogue identifier: AAVG_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 27(1982)39
Programming language: SCHOONSCHIP.
Computer: CDC CYBER 70-74.
Operating system: NOS/BE LEVEL 473.
RAM: 64K words
Word size: 60
Peripherals: disc.
Keywords: Elementary, Particle physics, Qcd, Multiquark spectroscopy, Colour-magnetic Interaction, Broken flavour symmetry, Construction of Wavefunctions in colour Flavour- and spin-space.
Classification: 11.5.

Nature of problem:
The purpose of MULTIQUARK is to use the algebra program SCHOONSCHIP to calculate the spectrum of multiquark systems. For this purpose the colour-magnetic interaction HCM has to be found. It is shown how this operator can be programmed in SCHOONSCHIP using the substitution facility.

Solution method:
The highest states in colour, spin and flavour space of the irreducible representations that can possibly be mixed under the action of Hcm have to be present when the program starts. The problem is then solved in two steps. The first step is to create the wavefunctions we are interested in. These are created from the highest states using step- operators in colour-, spin- and flavour-space. The necessary step operators are included among the blocks (equivalent to subroutines in FORTRAN). These wavefunctions, declared as COMMON variables, will be present on TAPE5 at the end of the program. These wavefunctions are used as input to the second program, where Hcm is applied to one of the wavefunctions.

The problem worked out in detail here is for 4qq~ systems. It is therefore easily also used for any subgroup of quarks present in this system, for instance qqq or qq~. If one wants to increase the number of quarks beyond 4qq~ the methods employed here are easily generalized.