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

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

2005-04-18

arxiv.org/abs/hep-ph/0504151v3

Phys.Rev. D72 (2005) 034012

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 2 figures, Third version, to appear in Phys.Rev.D

Scientific paper

10.1103/PhysRevD.72.034012

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

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