| 对四夸克凝聚的研究 |
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| 引用本文： | 陈立安,许子斌,何龙庆.对四夸克凝聚的研究[J].南京晓庄学院学报,2011,27(3):30-33. |
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| 作者姓名： | 陈立安 许子斌 何龙庆 |
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| 作者单位： | 1. 南京晓庄学院物理与电子工程学院,江苏南京,211171
2. 辽宁省葫芦岛市自来水公司,辽宁葫芦岛,125001 |
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| 基金项目： | 南京晓庄学院青年教师专项资助项目 |
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| 摘 要： | 文章通过外场方法得到了四夸克凝聚的一般表达式.这个一般表达式中既包含夸克传播子又包含着衣顶点,分析了其因子化问题,结果发现,只有当所有的着衣顶点取裸顶点的时候,四夸克凝聚的因子化假定才成立.为了表明实际情况下因子化假定在多大程度上成立,该文利用一个简单的胶子传播子模型在DS方程的框架下对四夸克凝聚的值做了计算,结果发现,在这个胶子传播子模型下,着衣顶点对四夸克凝聚的效应不是很大,但是也不能忽略.
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| 关 键 词： | 四夸克凝聚 真空饱和假定 因子化 DS方程 |
A Study on the Four-quark Condensate |
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| CHEN Li-an,XU Zi-bin,HE Long-qing.A Study on the Four-quark Condensate[J].Journal of Nanjing Xiaozhuang College,2011,27(3):30-33. |
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| Authors: | CHEN Li-an XU Zi-bin HE Long-qing |
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| Institution: | 1.Dept of Physics and Engineering,Nanjing Xiaozhuang University,Nanjing 211171,Jiangsu; 2.Huludao Water-Supplying Company,Huludao 125001,Liaoning) |
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| Abstract: | In the present study,the general formula for the four-quark condensate is obtained by the background field method.This formula contains the dressed quark propagator and the corresponding fully-dressed vertexes.Then the factorization problem of the four-quark condensate is analyzed and it is found that factorization can be established only when the bare vertex approximation is adopted.In order to check the accurate degree of the factorization in real situations,a simple nonperturbative QCD model is used to calculate the numerical value of the four-quark condensate and the result shows that the effects of introducing dressed vertex are small but cannot be ignored. |
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| Keywords: | four-quark condensate vacuum saturation assumption factorization Dyson-Schwinger equation |
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