Contribution of Instanton Induced Interaction for Penta-quarks in MIT Bag Model
Tetsuya Shinozaki, Makoto Oka, Sachiko Takeuchi
Abstract
Roles of instanton induced interactions (III) in the masses of pentaquark baryons, Theta+ (J=1/2 and 3/2) and Xi--, and a dibaryon, H, are discussed using the MIT bag model. It is shown that the two-body terms in III give a strong attraction mainly due to the increase of the number of pairs in multi-quark systems. In contrast, the three-body u-d-s interaction is repulsive. It is found that III lowers the mass of negative-parity Theta+ as much as 100 MeV from the mass predicted by the bag model without III.
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