Contribution of Instanton Induced Interaction for Penta-quarks in MIT Bag Model

Details Contribution of Instanton Induced Interaction for Penta-quarks in MIT Bag Model Contribution of Instanton Induced Interaction for Penta-quarks in MIT Bag Model

2004-10-15

arxiv.org/abs/hep-ph/0410234v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures, Talk given at International Workshop PENTAQUARK04 at SPring-8, Japan, July 20-23, 2004

Scientific paper

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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