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arXiv 0801.3146hep-lat
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含有Clover费米子和Symanzik改进胶子的双圈加性质量重整化

Two-loop additive mass renormalization with clover fermions and Symanzik improved gluons

A. Skouroupathis, M. Constantinou, H. Panagopoulos

摘要:

我们计算了格点量子色动力学中跳跃参数$κ_c$的临界值,最多可达微扰理论中的两个环。我们采用Sheikholeslami-Wohlert(三叶草)改进的费米子作用和Symanzik改进的胶子作用与4-和6-链接循环。我们研究的数量是一个典型的情况下,真空期望值导致的添加剂重整化,因此,它的特点是由一个电源(线性)发散的晶格间距,其计算在于微扰理论的适用性的限制。我们的结果是多项式在$c_{SW}$(三叶草参数),并涵盖了广泛的值的Symanzik系数$c_i$。显式地示出了对颜色数N和费米子味数$N_f$的依赖性。为了将我们的结果与来自蒙特卡罗模拟的$κ_c$的非微扰评估进行比较,我们采用了改进的微扰理论方法来改进动作。

英文摘要:

We calculate the critical value of the hopping parameter, $κ_c$, in Lattice QCD, up to two loops in perturbation theory. We employ the Sheikholeslami-Wohlert (clover) improved action for fermions and the Symanzik improved gluon action with 4- and 6-link loops. The quantity which we study is a typical case of a vacuum expectation value resulting in an additive renormalization; as such, it is characterized by a power (linear) divergence in the lattice spacing, and its calculation lies at the limits of applicability of perturbation theory. Our results are polynomial in $c_{SW}$ (clover parameter) and cover a wide range of values for the Symanzik coefficients $c_i$. The dependence on the number of colors N and the number of fermion flavors $N_f$ is shown explicitly. In order to compare our results to non perturbative evaluations of $κ_c$ coming from Monte Carlo simulations, we employ an improved perturbation theory method for improved actions.

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