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Decay width of the pentaquark state $Θ^+(1540)$ with QCD sum rules

Zhi-Gang Wang·Wei-Min Yang·Shao-Long Wan
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Abstract

In this article, we take the point of view that the pentaquark state $Θ^+(1540)$ has negative parity, and choose the diquark-triquark type interpolating current to calculate the strong coupling constant $g_{ΘNK}$ in the QCD sum rule approach. Our numerical results indicate the values of the strong coupling constant $g_{ΘNK}$ are very small, $|g_{ΘNK}|=0.175\pm0.084$, and the width $Γ_Θ<4MeV$, which can explain the narrow width $Γ\leq 10 MeV$ naturally.

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Zhi-Gang Wang, Wei-Min Yang, Shao-Long Wan. 2005-07-31. Decay width of the pentaquark state $Θ^+(1540)$ with QCD sum rules. https://doi.org/10.1103/physrevd.72.034012

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