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arXiv · hep-ph/0404065

Instanton induced quark dynamics and the pentaquark

N. I. Kochelev·H. -J. Lee·V. Vento
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Abstract

We analyze the existence of the exotic $Θ^+$ from the perspective of instanton induced quark dynamics. The 't Hooft interaction gives strong attraction in specific channels of the triquark $ud\bar s$ and diquark $ud$ configurations. In particular it leads to a light $ud\bar s$ triquark cluster, with the mass around $750 {\rm MeV}$, in the I=0, $S=1/2$ and color 3 configuration, and a light $ud$-diquark configuration, with mass $440 {\rm MeV}$, in the I=0, S=0 and color {$\bar{3}$} configuration. If we consider the pentaquark as a bound state of such triquark and diquark configurations in a relative L=1 state we obtain good agreement with the data. The small width of $Θ^+$ has a natural explanation in this model.

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N. I. Kochelev, H. -J. Lee, V. Vento. 2004-04-15. Instanton induced quark dynamics and the pentaquark. https://doi.org/10.1016/j.physletb.2004.05.011

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