作为CP分析仪的“被遗忘的”衰变S -> Z+h
The "forgotten" decay S -> Z+h as a CP analyzer
摘要：
标量粒子$S$是标准模型下的规范单态，是许多基础物理模型的通用特征，特别是作为隐藏或暗区的可能介体。我们表明，衰变$S\to Zh$提供了一个强大的探针的CP性质的标量，因为它是允许的，只有当$S$有CP奇相互作用。我们进行了一个独立的模型分析，这种衰变的背景下，有效的拉格朗日和计算相关的威尔逊系数所产生的整合出重费米子一圈的顺序。我们用ATLAS和CMS观测到的750 GeV双光子共振的例子来说明我们的发现，并表明$S\to Zh$的衰变率自然可能与双光子率的大小相似或更大。
英文摘要：
Scalar particles $S$ which are gauge singlets under the Standard Model are generic features of many models of fundamental physics, in particular as possible mediators to a hidden or dark sector. We show that the decay $S\to Zh$ provides a powerful probe of the CP nature of the scalar, because it is allowed only if $S$ has CP-odd interactions. We perform a model-independent analysis of this decay in the context of an effective Lagrangian and compute the relevant Wilson coefficients arising from integrating out heavy fermions to one-loop order. We illustrate our findings with the example of the 750 GeV diphoton resonance seen by ATLAS and CMS and show that the $S\to Zh$ decay rate could naturally be of similar magnitude or larger than the diphoton rate.
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