Running coupling from gluon and ghost propagators in the Landau gauge: Yang-Mills theories with adjoint fermions
Running coupling from gluon and ghost propagators in the Landau gauge: Yang-Mills theories with adjoint fermions
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DOI：
10.1103/physrevd.97.074510
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发表时间：
2017-09
影响因子：
5
通讯作者：
G. Bergner;S. Piemonte
中科院分区：
文献类型：
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作者：
G. Bergner;S. Piemonte
规范群伴随表示 (AdjQCD) 中费米子变换的非阿贝尔规范理论是许多描述标准模型之外的物理模型的基本要素。两个相关的例子是 N=1 超对称杨-米尔斯 (SYM) 理论和最小步行技术，它们是分别与一个伴随马约拉纳费米子和两个伴随狄拉克费米子耦合的规范理论。虽然限制是 N=1 SYM 的一个属性，但最小行走技术颜色预计是红外共形的。我们研究朗道规范中鬼场和胶子场的传播子，以计算 MiniMom 方案中的运行耦合。我们分析了 Nf=1/2,1,3/2 和 2 个狄拉克费米子的 SU(2) 伴随 QCD 的格子蒙特卡罗模拟的几个不同系综。我们展示了随着相互作用的费米子数量向共形窗口增加，耦合的运行如何变化。
Non-Abelian gauge theories with fermions transforming in the adjoint representation of the gauge group (AdjQCD) are a fundamental ingredient of many models that describe the physics beyond the Standard Model. Two relevant examples are N=1 supersymmetric Yang-Mills (SYM) theory and minimal walking technicolor, which are gauge theories coupled to one adjoint Majorana and two adjoint Dirac fermions, respectively. While confinement is a property of N=1 SYM, minimal walking technicolor is expected to be infrared conformal. We study the propagators of ghost and gluon fields in the Landau gauge to compute the running coupling in the MiniMom scheme. We analyze several different ensembles of lattice Monte Carlo simulations for the SU(2) adjoint QCD with Nf=1/2,1,3/2, and 2 Dirac fermions. We show how the running of the coupling changes as the number of interacting fermions is increased towards the conformal window.