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arXiv 1306.3881hep-lat
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改进交错双线性系统的非微扰重整化

Non-perturbative Renormalization for Improved Staggered Bilinears

Andrew T. Lytle, Stephen R. Sharpe

摘要:

本文将非微扰重整化应用于改进的交错费米子双线性系统。我们解释了如何推广的方法交错费米子的方式是一致的晶格对称性,并介绍了一种新的类型的晶格双线性变换协变,避免混合。我们推导出传播子和顶点的晶格对称性的后果。我们实现的方法数值hyperplasma涂抹(HYP)和asqtad价费米子的行动,使用晶格与asqtad海夸克产生的MILC合作。我们比较非微扰的结果,从而获得那些从微扰理论,使用两个尺度无关的比率bilinears(其中我们计算26),和尺度相关bilinears本身。总的来说,我们发现,如果我们允许截断误差的大小大致为单圈项的平方(对于比率)或大小为O(1)\times α ^2(对于双线性本身),单圈微扰理论就能成功地描述HYP费米子的结果。然而,微扰理论在描述非微扰asqtad结果方面不太成功。

英文摘要:

We apply non-perturbative renormalization to bilinears composed of improved staggered fermions. We explain how to generalize the method to staggered fermions in a way which is consistent with the lattice symmetries, and introduce a new type of lattice bilinear which transforms covariantly and avoids mixing. We derive the consequences of lattice symmetries for the propagator and vertices. We implement the method numerically for hypercubic-smeared (HYP) and asqtad valence fermion actions, using lattices with asqtad sea quarks generated by the MILC collaboration. We compare the non-perturbative results so obtained to those from perturbation theory, using both scale-independent ratios of bilinears (of which we calculate 26), and the scale-dependent bilinears themselves. Overall, we find that one-loop perturbation theory provides a successful description of the results for HYP-fermions if we allow for a truncation error of roughly the size of the square of the one-loop term (for ratios) or of size O(1) \times α^2 (for the bilinears themselves). Perturbation theory is, however, less successful at describing the non-perturbative asqtad results.

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