Pentaquark Decay Width in QCD Sum Rules

Details Pentaquark Decay Width in QCD Sum Rules Pentaquark Decay Width in QCD Sum Rules

2005-03-18

arxiv.org/abs/hep-ph/0503193v1

Phys.Rev. D72 (2005) 034003

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 6 figures

Scientific paper

10.1103/PhysRevD.72.034003

In a diquark-diquark-antiquark picture of the pentaquark we study the decay $\Theta \rightarrow K^{+} n$ within the framework of QCD sum rules. After evaluation of the relevant three-point function, we extract the coupling $g_{\Theta nK}$ which is directly related to the pentaquark width. Restricting the decay diagrams to those with color exchange between the meson-like and baryon-like clusters reduces the coupling constant by a factor of four. Whereas a small decay width might be possible for a positive parity pentaquark, it seems difficult to explain the measured width for a pentaquark with negative parity.

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