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arXiv 2007.01810hep-phhep-lat
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手征破缺系统的近共形动力学

Near-conformal dynamics in a chirally broken system

Thomas Appelquist, Richard C. Brower, Kimmy K. Cushman, George T. Fleming, Andrew D. Gasbarro, Anna Hasenfratz, Xiao-Yong Jin, Ethan T. Neil, James C. Osborn, C… 展开作者

Thomas Appelquist, Richard C. Brower, Kimmy K. Cushman, George T. Fleming, Andrew D. Gasbarro, Anna Hasenfratz, Xiao-Yong Jin, Ethan T. Neil, James C. Osborn, Claudio Rebbi, Enrico Rinaldi, David Schaich, Pavlos Vranas, Oliver Witzel

摘要:

复合希格斯模型必须表现出与量子色动力学(QCD)非常不同的动力学,无论它们是将希格斯玻色子玻色子描述为类玻色子态还是伪南布-戈德斯通玻色子。大尺度分离和大反常尺寸是唯象模型经常需要的。质量分裂系统非常适合复合希格斯模型,因为它们在紫外线下由共形固定点控制,但在红外线下手性断裂。在这项工作中,我们使用格点场论计算畴壁费米子调查系统的四轻和六重的味道。我们演示了附近的共形不动点如何影响四种光味的性质,表现出手征对称性打破在红外。具体地说,我们描述超尺度的维数物理量,并确定相应的异常质量尺寸。我们得到了$y_m=1+γ^*= 1.47(5)$,表明$N_f=10$位于共形窗内。将低能谱与手性微扰理论的预测进行比较,我们观察到非常好的一致性,这支持了4+6质量分裂系统具有相对较轻的$0^{++}$等单线态标量的近共形动力学的期望。

英文摘要:

Composite Higgs models must exhibit very different dynamics from quantum chromodynamics (QCD) regardless whether they describe the Higgs boson as a dilatonlike state or a pseudo-Nambu-Goldstone boson. Large separation of scales and large anomalous dimensions are frequently desired by phenomenological models. Mass-split systems are well-suited for composite Higgs models because they are governed by a conformal fixed point in the ultraviolet but are chirally broken in the infrared. In this work we use lattice field theory calculations with domain wall fermions to investigate a system with four light and six heavy flavors. We demonstrate how a nearby conformal fixed point affects the properties of the four light flavors that exhibit chiral symmetry breaking in the infrared. Specifically we describe hyperscaling of dimensionful physical quantities and determine the corresponding anomalous mass dimension. We obtain $y_m=1+γ^*= 1.47(5)$ suggesting that $N_f=10$ lies inside the conformal window. Comparing the low energy spectrum to predictions of dilaton chiral perturbation theory, we observe excellent agreement which supports the expectation that the 4+6 mass-split system exhibits near-conformal dynamics with a relatively light $0^{++}$ isosinglet scalar.

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