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arXiv 1310.2128hep-lathep-ph
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费米子在双指数表象中的规范理论

Gauge theories with fermions in two-index representations

Thomas DeGrand, Yigal Shamir, Benjamin Svetitsky

摘要:

在对缓慢运行的理论的特性作了一些介绍性的评论之后,我将报告用薛定谔泛函方法对两个规范理论得到的结果,这两个规范理论被认为位于共形窗的底部附近:在二指数反对称表象中,有两个伴随狄拉克费米子的SU(3)理论和有六个狄拉克费米子的SU(4)理论。在这两种情况下,我们发现一个小的β函数在强耦合,但我们不能确认或排除红外固定点。在这两个理论中,质量反常维度趋于稳定,保持在0.5以下,很像前面研究的费米子在双指数对称表象中的理论。

英文摘要:

After some introductory comments on the peculiar features of slowly running theories, I will report results obtained using the Schrodinger functional technique for two gauge theories that are believed to lie near the bottom of the conformal window: the SU(3) theory with two adjoint Dirac fermions, and the SU(4) theory with six Dirac fermions in the two-index antisymmetric representation. In both cases we find a small beta function in strong coupling, but we cannot confirm or rule out an infrared fixed point. In both theories the mass anomalous dimension levels off, staying well below 0.5, much like the theories with fermions in the two-index symmetric representation investigated earlier.

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