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arXiv 1310.2893hep-phhep-ex
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黄金通道中有效Higgs耦合的提取

Extracting Effective Higgs Couplings in the Golden Channel

Yi Chen, Roberto Vega-Morales

摘要:

希格斯粒子衰变为四个带电轻子的运动学分布,即所谓的“黄金通道”,是研究希格斯粒子与中性电弱规范玻色子耦合的张量结构的有力工具。在这项研究中,我们构建了一个全面的分析框架的第一部分,旨在最大限度地提高这个通道中包含的信息,以执行直接提取的各种可能的希格斯耦合。为此,我们首先完成了一个较早的分析计算的黄金通道信号和背景的首阶全微分截面,包括4e和$4μ$的最终状态之间的干扰相同的最终状态。我们还研究了标量张量耦合的不同可能的组合的相对分数,通过整合的全微分截面在所有的运动学变量,以及显示各种双差分光谱的信号和背景。从这些解析表达式,我们然后构建一个“发电机级”的分析框架的基础上的极大似然方法。我们证明了我们的框架执行多参数提取的所有可能的有效耦合的自旋0标量对中性电弱规范玻色子,包括任何相关性的能力。这个框架提供了一个强大的方法来研究这些耦合,可以很容易地适应,包括相关的检测器和系统的影响,我们证明在一个配套的研究如下。

英文摘要:

Kinematic distributions in Higgs decays to four charged leptons, the so called `golden channel, are a powerful probe of the tensor structure of its couplings to neutral electroweak gauge bosons. In this study we construct the first part of a comprehensive analysis framework designed to maximize the information contained in this channel in order to perform direct extraction of the various possible Higgs couplings. To that end we first complete an earlier analytic calculation of the leading order fully differential cross sections for the golden channel signal and background to include the 4e and $4μ$ final states with interference between identical final states. We also examine the relative fractions of the different possible combinations of scalar-tensor couplings by integrating the fully differential cross section over all kinematic variables as well as show various doubly differential spectra for both the signal and background. From these analytic expressions we then construct a `generator level' analysis framework based on the maximum likelihood method. We demonstrate the ability of our framework to perform multi-parameter extractions of all the possible effective couplings of a spin-0 scalar to pairs of neutral electroweak gauge bosons including any correlations. This framework provides a powerful method for study of these couplings and can be readily adapted to include the relevant detector and systematic effects which we demonstrate in an accompanying study to follow.

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