潜伏在TeV标度以下的伪向量
Lurking pseudovectors below the TeV scale
摘要：
如果电弱对称性破缺是由一个新的强耦合动力学扇区驱动的，人们预计它们的束缚态将出现在TeV尺度或略低于TeV尺度。然而，电弱精度数据对大多数现有模型施加了严格的限制，使它们处于压力之下。传统的模型要求新的复合态是成对出现的，它们是相当重的，接近简并的自旋1共振。在本文中，我认为自旋为1的状态实际上可以更轻，而不与实验界限相冲突。作为一个例子，我考虑一个复合模型与轻赝矢量共振耦合到标准模型规范玻色子，费米子和标量场。我展示了如何这样的共振基本上没有留下任何印记的非线性光学修正的标准模型。这不是通过参数调整发生的，而是真实UV完成的通用属性的结果。这个伪矢量大多不受现有数据的约束，可能轻至600 GeV。在本文的最后一部分，我简要地讨论了它的最典型的签名，直接检测在对撞机。
英文摘要：
If electroweak symmetry breaking is driven by a new strongly-coupled dynamical sector, one expects their bound states to appear at the TeV scale or slightly below. However, electroweak precision data imposes severe constraints on most of the existing models, putting them under strain. Conventional models require the new composite states to come in pairs of rather heavy, close to degenerate spin-1 resonances. In this paper I argue that spin-1 states can actually be lighter without clashing with experimental bounds. As an example, I consider a composite model with a light pseudovector resonance that couples to the Standard Model gauge boson, fermion and scalar fields. I show how such a resonance leaves basically no imprint on the NLO corrections to the Standard Model. This happens not through parameter tuning, but rather as a consequence of generic properties of realistic UV completions. This pseudovector is mostly unconstrained by existing data and could be as light as 600 GeV. In the last part of the paper I briefly discuss its most characteristic signatures for direct detection at colliders.
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