论文标题
QCD和规则中的非本地Gluon凝结物
Nonlocal gluon condensates in QCD sum rules
论文作者
论文摘要
非局部Gluon冷凝物是对Gluon场强量量产物的真空期望。将两，三和四胶质冷凝物的短距离扩张呈现到Dimension-8本地运营商。我们提出了一种根据背景字段方法中提出的扩展和Feynman图技术来计算Wilson系数的方法。使用胶球电流相关器作为示例来证明该方法。在QCD总规则中讨论了背景字段方法的方法论方面。我们确认了两个胶结$ 0^{\ pm +}的运算符产品扩展（OPE）的结果，并计算出来自Dimension-6四夸克冷凝物和尺寸8混合夸克 - 格鲁隆冷凝物的其他贡献。 QCD总规则中使用的opes thi-gluon $ 0^{\ pm +} $胶合球被重新访问至dimension-6订单。
Nonlocal gluon condensates are vacuum expectations of the product of gluon field strength tensors. Short-distance expansions of two-, three-, and four-gluon condensates are presented up to dimension-8 local operators. We propose a method for calculating the Wilson coefficients based on the presented expansions and the Feynman diagram technique in the background field approach. The method is demonstrated using the glueball current correlators as examples. Methodological aspects of the background field approach are discussed in relation to glueball studies within QCD sum rules. We confirm the results for Operator Product Expansion (OPE) of the two-gluon $0^{\pm +}$ glueball current correlators and calculate additional contributions coming from dimension-6 four-quark condensate and dimension-8 mixed quark-gluon condensates. The OPEs used in QCD sum rules for three-gluon $0^{\pm +}$ glueballs are revisited up to dimension-6 order.
