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arXiv 1003.5359hep-ph
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超越彩虹阶梯近似的Dyson-Schwinger方程方法计算张量磁化率

Calculation of tensor susceptibility beyond rainbow-ladder approximation of Dyson-Schwinger equations approach

Yuan-mei Shi, Hui-xia Zhu, Wei-min Sun, Hong-shi Zong

摘要:

本文推广了[Y. M. Shi,K. P. Wu,W. M. Sun,H. S. Zong,J. L. Ping,Phys. Lett. B $\bf{639}$,248(2006)]的方法与采用Ball-Chiu(BC)顶点的方法相比。研究了夸克胶子顶点的修饰效应对张量真空磁化率的影响。结果表明,与彩虹梯近似值相比,在BC顶点近似下得到的张量真空磁化率降低了约10%。这说明在DS方法中计算张量真空磁化率时,夸克胶子顶点的修饰效应并不大。

英文摘要:

In this paper, we extend the calculation of tensor vacuum susceptibility in the rainbow-ladder approximation of the Dyson-Schwinger (DS) approach in [Y.M.Shi, K.P.Wu, W.M.Sun, H.S.Zong, J.L.Ping, Phys. Lett. B $\bf{639}$, 248 (2006)] to that of employing the Ball-Chiu (BC) vertex. The dressing effect of the quark-gluon vertex on the tensor vacuum susceptibility is investigated. Our results show that compared with its rainbow-ladder approximation value, the tensor vacuum susceptibility obtained in the BC vertex approximation is reduced by about 10%. This shows that the dressing effect of the quark-gluon vertex is not large in the calculation of the tensor vacuum susceptibility in the DS approach.

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