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The Conversion of Gluons into Quarks and the Multiquark States

The rate for the conversion of the gluon into a color octet quark pair which subsequently forms a multiquark state with another quark pair or a gluon is discussed. The static potential in a state where and is studied in the MIT bag model. It is shown that the repulsive Coulomb force between and is dominant at small separations, which would significantly suppress the wave function at the origin. For the charm quark the ratio of for the ordinary to that for the in the state is estinated to be 2-5. Therefore the assumption would lead to an overestimation for the rate of and it is necessary to take the suppression effect of the repulsive Coulomb force into consideration.