论文标题
higgsstrahlung的两极分化$ z $ cross部分确定异常$ zzh $耦合
Polarized $Z$ cross sections in Higgsstrahlung for the determination of anomalous $ZZH$ couplings
论文作者
论文摘要
在电子峰值对撞机上与$ z $联合的希格斯玻色子的生产是测量希格斯玻色子耦合的最干净的方法之一。鉴于大型生产横截面的能量高于阈值，可以通过测量极化$ z $的横截面来对过程进行更详细的研究，以便测量可能的异常$ ZZH $耦合。我们表明，$ e^+e^ - \ to zh $的某些跨部分的某些组合有助于增强或隔离两种$ ZZH $耦合之一，以CP和Lorentz不变性的一般为由。这些组合对于以相对独立的模型方式，在有效的场理论，两-higgs-doublet模型和复合希格斯模型的特定环境中获取$ zzh $耦合的信息可能很有用。我们发现，$ z $的纵向螺旋分数预计对异常耦合不敏感，并且在我们考虑的情况下，在标准模型中的价值将接近其价值。我们还讨论了提出的测量对异常耦合的敏感性。
The production of a Higgs boson in association with a $Z$ at an electron-positron collider is one of the cleanest methods for the measurement of the couplings of the Higgs boson. In view of the large production cross section at energies a little above the threshold, it seems feasible to make a more detailed study of the process by measuring the cross sections for polarized $Z$ in order to measure possible anomalous $ZZH$ couplings. We show that certain combinations of cross sections in $e^+e^- \to ZH$ with different $Z$ polarizations help to enhance or isolate the effect of one of the two kinds of $ZZH$ couplings possible on general grounds of CP and Lorentz invariance. These combinations can be useful to get information on the $ZZH$ coupling in the specific contexts of an effective field theory, two-Higgs-doublet models, and composite Higgs models, in a relatively model-independent fashion. We find in particular that the longitudinal helicity fraction of the $Z$ is expected to be insensitive to anomalous couplings, and would be close to its value in the standard model in the scenarios we consider. We also discuss the sensitivity of the proposed measurements to the anomalous couplings.
