Narrow pentaquarks in QCD

被引：0
|
作者：
Navarra, FS [1 ]
Nielsen, M [1 ]
da Silva, RR [1 ]
机构：
[1] Univ Sao Paulo, Inst Fis, CP 66318, BR-05389970 Sao Paulo, SP, Brazil
来源：
HADRON SPECTROSCOPY | 2006年 / 814卷
基金：
巴西圣保罗研究基金会;
关键词：
D O I：
暂无
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We study the decay Theta -> K(+)n within the framework of QCD sum rules and compute 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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收藏
页码：330 / +
页数：3
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