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arXiv 2202.04035hep-ph
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SM复单态扩展中希格斯玻色子不可见衰变的单圈修正

One-loop Corrections to the Higgs Boson Invisible Decay in a Complex Singlet Extension of the SM

Felix Egle, Margarete Mühlleitner, Rui Santos, João Viana

摘要:

在对撞机上寻找暗物质(DM)的想法是建立在寻找看不见的东西的基础上的。有基于生产和衰变过程的搜索,其中DM可能会显示其自身为缺失的能量。如果什么都找不到,我们用DM候选者来约束标准模型(SM)的许多扩展的参数空间的最佳工具是希格斯玻色子。随着希格斯耦合的测量变得越来越精确,高阶修正将开始发挥重要作用。对不可见衰减宽度的树级贡献提供了关于门户耦合的信息。高阶修正也使我们能够从希格斯势的暗区获得树级振幅中不存在的其他参数。在这项工作中,我们将专注于复杂的单重扩展的SM阶段与DM候选人。计算了希格斯玻色子衰变为两个DM粒子的单圈电弱修正。我们发现,修正是稳定的,几个百分点的顺序。目前的测量希格斯不可见分支比,BR $(H \to$不可见$) < 0.11$,已经限制了参数空间的模型在领先的顺序。我们预计,到LHC结束时,实验测量将需要包括对衰变的电弱修正,以匹配实验精度。此外,唯一的竞争过程,这是直接检测,被证明有一个截面以下的中微子地板。

英文摘要:

The search for dark matter (DM) at colliders is founded on the idea of looking for something invisible. There are searches based on production and decay processes where DM may reveal itself as missing energy. If nothing is found, our best tool to constrain the parameter space of many extensions of the Standard Model (SM) with a DM candidate is the Higgs boson. As the measurements of the Higgs couplings become increasingly precise, higher-order corrections will start to play a major role. The tree-level contribution to the invisible decay width provides information about the portal coupling. Higher-order corrections also gives us access to other parameters from the dark sector of the Higgs potential that are not present in the tree-level amplitude. In this work we will focus on the complex singlet extension of the SM in the phase with a DM candidate. We calculate the one-loop electroweak corrections to the decay of the Higgs boson into two DM particles. We find that the corrections are stable and of the order of a few percent. The present measurement of the Higgs invisible branching ratio, BR$(H \to$ invisible $) < 0.11$, already constrains the parameter space of the model at leading order. We expect that by the end of the LHC the experimental measurement will require the inclusion of the electroweak corrections to the decay in order to match the experimental accuracy. Furthermore, the only competing process, which is direct detection, is shown to have a cross section below the neutrino floor.

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