Appelquist Thomas, Ingoldby James, Piai Maurizio
Department of Physics, Sloane Laboratory, Yale University, New Haven, Connecticut 06520, USA.
Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy.
Phys Rev Lett. 2021 May 14;126(19):191804. doi: 10.1103/PhysRevLett.126.191804.
We analyze a composite Higgs model based on the confining SU(3) gauge theory with N_{f}=8 Dirac fermions in the fundamental representation. This gauge theory has been studied on the lattice and shown to be well described by a dilaton effective field theory (EFT). Here we modify the EFT by assigning standard-model quantum numbers such that four of the composite pseudo-Nambu-Goldstone boson (pNGB) fields form the standard-model Higgs doublet, by coupling it to the top quark and by adding to the potential a term that triggers electroweak symmetry breaking. The model contains a pNGB Higgs boson, a set of heavier pNGBs, and an approximate dilaton in the same mass range. We study the phenomenology of the model and discuss the amount of tuning required to ensure consistency with current direct and indirect bounds on new physics, highlighting the role of the dilaton field.
我们分析了一个基于禁闭SU(3)规范理论的复合希格斯模型，该理论在基本表示中有(N_f = 8)个狄拉克费米子。这个规范理论已经在晶格上进行了研究，并被证明可以由一个伸缩子有效场论（EFT）很好地描述。在这里，我们通过赋予标准模型量子数来修改EFT，使得四个复合赝南布-戈德斯通玻色子（pNGB）场形成标准模型希格斯二重态，通过将其与顶夸克耦合，并通过在势中添加一项来触发电弱对称性破缺。该模型包含一个pNGB希格斯玻色子、一组较重的pNGB以及一个处于相同质量范围的近似伸缩子。我们研究了该模型的现象学，并讨论了为确保与当前新物理的直接和间接限制相一致所需的微调量，突出了伸缩子场的作用。
