论文标题
超越标准模型有效现场理论：单线扩展标准模型
Beyond the Standard Model Effective Field Theory: The Singlet Extended Standard Model
论文作者
论文摘要
简化模型的假设之一是，LHC可以访问一些新的粒子，并且所有其他新粒子都很重且脱钩。有效的场理论（EFT）方法提供了测试该假设的一致方法。可以使用涉及LHC上可访问的新粒子的高阶运算符来增强简化模型。除了标准模型EFT（BSM-EFT）之外，简化模型的任何UV完成都将能够匹配它们。在本文中，我们研究了最简单的简化模型：由真实量规标量表扩展的标准模型。除了通常的可重新分配相互作用外，我们还包括单元标量表与标准模型粒子的尺寸5相互作用。正如我们将显示的那样，即使截止量表为3 TEV，这些新的有效相互作用也可以大大改变HIGGS精度测量和标量搜索的解释。此外，我们讨论了BSM-EFT中的功率计数如何在很大程度上取决于所考虑的过程和参数空间。最后，我们提出了一种$χ^2 $方法，以将新粒子搜索的限制与标准模型的测量结合在一起。与强制截止较重的共振率不同，我们的方法允许在与全球拟合一致的单个渠道中波动。
One of the assumptions of simplified models is that there are a few new particles and interactions accessible at the LHC and all other new particles are heavy and decoupled. The effective field theory (EFT) method provides a consistent method to test this assumption. Simplified models can be augmented with higher order operators involving the new particles accessible at the LHC. Any UV completion of the simplified model will be able to match onto these beyond the Standard Model EFTs (BSM-EFT). In this paper we study the simplest simplified model: the Standard Model extended by a real gauge singlet scalar. In addition to the usual renormalizable interactions, we include dimension-5 interactions of the singlet scalar with Standard Model particles. As we will show, even when the cutoff scale is 3 TeV, these new effective interactions can drastically change the interpretation of Higgs precision measurements and scalar searches. In addition, we discuss how power counting in a BSM-EFT depends strongly on the processes and parameter space under consideration. Finally, we propose a $χ^2$ method to consistently combine the limits from new particle searches with measurements of the Standard Model. Unlike imposing a hard cut off on heavy resonance rates, our method allows fluctuations in individual channels that are consistent with global fits.
