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arXiv 1104.3606hep-ph
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SU(N)规范Beta函数的不动点合并

Fixed point merger in the SU(N) gauge beta functions

Yuki Kusafuka, Haruhiko Terao

摘要:

本文讨论了SU(N)规范β函数在QCD中的定性行为。在精确的重整化群框架下,通过提取重整化轨道,可以得到非微扰的beta函数。我们研究了一般四费米耦合的重整化群方程,以及在一个简单的近似方案中得到的规范耦合。结果表明,规范β函数在共形窗口中不仅存在红外不动点,而且存在紫外不动点。这些固定点彼此合并,并在共形窗口的边缘消失。夸克质量算符在不动点处的标度维数也被显示出来。

英文摘要:

We discuss qualitative behavior of the SU(N) gauge beta functions in QCD with many massless flavors. Non-perturbative beta functions can be obtained by extracting the renormalized trajectories in the exact renormalization group framework. We examine the renormalization group equations for the general four-fermi couplings as well as the gauge coupling obtained in a simple approximation scheme. It is shown that the gauge beta function possesses not only an IR but also a UV fixed point in the conformal window. These fixed points merge with each other and disappear at the edge of the conformal window. The scaling dimensions of the quark mass operator at the fixed points are also shown.

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