On the impact of dimension-eight SMEFT operators on Higgs measurements
On the impact of dimension-eight SMEFT operators on Higgs measurements
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DOI：
10.1007/jhep02(2019)123
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发表时间：
2018-08
影响因子：
5.4
通讯作者：
C. Hays;Adam Martin;V. Sanz;Jack Setford
中科院分区：
文献类型：
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作者：
C. Hays;Adam Martin;V. Sanz;Jack Setford
AbstractUsing生产的希格斯玻色子与aW玻色子作为一个测试案例，我们评估的影响，8维运营商的背景下，标准模型有效场论。在1/Λ的展开式中，8维SM干涉项和6维平方项出现在同一阶，因此，8维效应可以被看作是从单独使用6维算子的分析中推断出的新物理学的系统不确定性。为了研究8维算子的唯象后果，必须首先确定可以对给定过程做出贡献的算子的完整集合。我们通过希尔伯特级数方法的组合来实现这一点，该方法产生不变量的数量及其字段内容，并逐步将希尔伯特级数输出转换为现象学上有用的格式。我们提供的配方是通用的，适用于维度≤ 8标准模型有效理论内的任何其他过程。我们通过一次打开一个6维算子并将所有8维算子系数设置为相同的大小来量化8维算子的影响。在这个过程中，并给出当前的精度σ（pp→h W+），我们发现8维算子的影响推断的新的物理标度是小的，（几个%），与一些变化取决于8维系数的相对符号和6维算子被认为是。当σ（pp→hW+）被更精确地测量或（更显著地）在高质量运动学区域中测量时，8维项的影响增加。我们提供了一个FeynRules实现我们的运营商集，用于进一步更详细的分析。
AbstractUsing the production of a Higgs boson in association with aWboson as a test case, we assess the impact of dimension-8 operators within the context of the Standard Model Effective Field Theory. Dimension-8-SM-interference and dimension-6-squared terms appear at the same order in an expansion in 1/Λ, hence dimension-8 effects can be treated as a systematic uncertainty on the new physics inferred from analyses using dimension-6 operators alone. To study the phenomenological consequences of dimension-8 operators, one must first determine the complete set of operators that can contribute to a given process. We accomplish this through a combination of Hilbert series methods, which yield the number of invariants and their field content, and a step-by-step recipe to convert the Hilbert series output into a phenomenologically useful format. The recipe we provide is general and applies to any other process within the dimension ≤ 8 Standard Model Effective Theory. We quantify the effects of dimension-8 by turning on one dimension-6 operator at a time and setting all dimension-8 operator coefficients to the same magnitude. Under this procedure and given the current accuracy onσ(pp→h W+), we find the effect of dimension-8 operators on the inferred new physics scale to be small,(few %), with some variation depending on the relative signs of the dimension-8 coefficients and on which dimension-6 operator is considered. The impact of the dimension-8 terms grows as σ(pp→hW+) is measured more accurately or (more significantly) in high-mass kinematic regions. We provide a FeynRules implementation of our operator set to be used for further more detailed analyses.