Phys. Rev. D 72, 034003 (2005) [10 pages]Pentaquark decay width in QCD sum rulesReceived 28 April 2005; published 5 August 2005 In a diquark-diquark-antiquark picture of the pentaquark we study the decay Θ→K+n within the framework of QCD sum rules. After evaluation of the relevant three-point function, we extract the coupling gΘnK which is directly related to the pentaquark width. Restricting the decay diagrams to those with color exchange between the mesonlike and baryonlike clusters reduces the coupling constant by a factor of 4. 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. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.72.034003
DOI:
10.1103/PhysRevD.72.034003
PACS:
12.38.Lg, 12.39.Mk, 12.40.Yx
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