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arXiv 0704.0413hep-ph
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极控QCD求和规则中的奇异强子

Exotic Hadron in Pole-dominated QCD Sum Rules

Toru Kojo, Daisuke Jido, Arata Hayashigaki

摘要:

我们在QCD求和规则中研究了五夸克态$Θ^{+} (I=0,J=1/2)$,强调我们不能提取Borel窗口之外的五夸克态的任何性质。为了找到合适的Borel窗,我们准备了一个良好的设置的分解器,并进行算子乘积展开到15维的因式分解假设。我们的程序减少了不必要的高能量污染,并提高了低能量相关。在Borel窗口中,手征偶和奇和规则的独立分析给出了$Θ^+$质量、$1.68\pm0.22$ GeV和剩余的一致值。发现奇偶校验为{ \it正}。

英文摘要:

We study pentaquark $Θ^{+} (I=0,J=1/2)$ in the QCD sum rules emphasizing that we can not extract any properties of the pentaquark outside of the Borel window. To find the appropriate Borel window, we prepare a favorable set up of the correlators and carry out the operator product expansion up to dimension 15 within factorization hypothesis. Our procedures reduce the unwanted high energy contaminations and enhance the low energy correlation. In the Borel window, independent analyses for the chiral-even and odd sum rules give the consistent values of the $Θ^+$ mass, $1.68\pm0.22$ GeV, and the residue. The parity is found to be {\it positive}.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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