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In this article, we take the point of view that the pentaquark state$\Theta^+(1540)$ has negative parity, and choose the diquark-triquark typeinterpolating current to calculate the strong coupling constant $g_{\Theta NK}$in the QCD sum rule approach. Our numerical results indicate the values of thestrong coupling constant $g_{\Theta NK}$ are very small, $|g_{\ThetaNK}|=0.175\pm0.084$, and the width $\Gamma_\Theta <4MeV$, which can explain thenarrow width $\Gamma \leq 10 MeV$ naturally.Comment: 10 pages, 2 figures, Third version, to appear in Phys.Rev.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Decay width of the pentaquark state<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>Θ</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mo stretchy="false">(</mml:mo><mml:mn>1540</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>with QCD sum rules

Decay width of the pentaquark stateΘ+(1540)with QCD sum rules