论文标题
Leptonic标量门户：Muon $ G-2 $异常和暗物质的起源？
Leptonic scalar portal: Origin of muon $g-2$ anomaly and dark matter?
论文作者
论文摘要
我们提出了一个模型，同时解释了4.2 $σ$ MUON $ G-2 $异常和暗物质的遗物密度（DM），其中DM通过标量门户门户玻色子$φ$携带的sm leptonic和sm leptonic数字与标准模型（SM）相互作用，并允许$ e $ e $ E. $φ$可以用高能电子产生，在反应$ e z \ toμzφ$中散射目标核，然后迅速无形衰减$ φ〜 \ to $ 〜DM粒子，并在最终状态下单个外出的MUON伴随着大量失踪能量的事件中搜索。有趣的是，在$ \ simeq 3 \ times 10^{11} $的数据样本中已经观察到了几个具有相似签名的事件，2016- 2018年收集的目标是在cern sps的Na64实验中搜索轻度暗物质的目标。将这些事件归因于背景，使我们能够对$φ$质量和耦合设置第一个约束，同时果断地将这些事件的起源和剩余参数空间的很大一部分放在带有升级的NA64检测器或其他计划的实验的未来中。
We present a model explaining both the 4.2 $σ$ muon $g-2$ anomaly and the relic density of dark matter (DM) in which DM interacts with the Standard Model (SM) via a scalar portal boson $φ$ carrying both dark and SM leptonic numbers, and mediating a nondiagonal interaction between the electron and muon that allows $e \leftrightarrow μ$ transitions. The $φ$ could be produced in high-energy electron scattering off a target nuclei in the reaction $e Z \to μZφ$ followed by the prompt invisible decay $φ~\to$~DM particles and searched for in events with large missing energy accompanied by a single outgoing muon in the final state. Interestingly, several events with a similar signature have been observed in a data sample of $\simeq 3\times 10^{11}$ electrons on target collected during 2016-2018 for the search for light dark matter in the NA64 experiment at the CERN SPS [PRL {\bf 123}, 121801 (2019)]. Attributing so far these events to background allows us to set first constraints on the $φ$ mass and couplings while leaving at the same time decisively probing the origin of these events and a large fraction of the remaining parameter space to a near exiting future with the upgraded NA64 detector or other planned experiments.
