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arXiv 2001.02690hep-phhep-lathep-th
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进入共形窗口：多重表示规范理论

Into the conformal window: multi-representation gauge theories

Byung Su Kim, Deog Ki Hong, Jong-Wan Lee

备注：
39 pages, 8 figures, 8 tables; Revised version; To appear in PRD
发表信息：
Phys. Rev. D 101, 056008 (2020)
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摘要：

本文研究了四维规范理论在多重表象中与费米子物质场的共形窗口。特别相关的例子是紫外线完整模型与费米子在两个不同的表示认为在复合希格斯和顶部部分复合的背景下。我们首先讨论了各种分析方法来揭开共形窗口的下边缘，并将其扩展到多物质表示。特别地，我们认为，方案独立的系列展开的反常尺寸的费米子双线性在红外固定点，$γ_{\barχχ,\,{\rm IR}}$，结合的约束临界条件，$γ_{\barχχ,\,{\rm IR}} = 1$或等价的$γ_{\barχχ,\,{\rm IR}} (2-γ_{\barχχ,\,{\rm IR}})=1$，可以用来确定边界的共形相变的充分的物理基础。在说明性的情况下，$SU(2)$和$SU(3)$理论与$N_R$狄拉克费米子在各种表示，我们评估我们的结果与其他分析或晶格的结果进行比较。

英文摘要：

We investigate the conformal window of four-dimensional gauge theories with fermionic matter fields in multiple representations. Of particularly relevant examples are the ultra-violet complete models with fermions in two distinct representations considered in the context of composite Higgs and top partial-compositeness. We first discuss various analytical approaches to unveil the lower edge of the conformal window and their extension to the multiple matter representations. In particular, we argue that the scheme-independent series expansion for the anomalous dimension of a fermion bilinear at an infrared fixed point, $γ_{\barχχ,\,{\rm IR}}$, combined with the conjectured critical condition, $γ_{\barχχ,\,{\rm IR}} = 1$ or equivalently $γ_{\barχχ,\,{\rm IR}} (2-γ_{\barχχ,\,{\rm IR}})=1$, can be used to determine the boundary of conformal phase transition on fully physical grounds. In illustrative cases of $SU(2)$ and $SU(3)$ theories with $N_R$ Dirac fermions in various representations, we assess our results by comparing to other analytical or lattice results.

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