Abstract

The NA64 experiment consists of two detectors which are planned to be located at the electron (NA64e) and muon (NA64μ) beams of the CERN SPS and start operation after the LHC long-stop 2 in 2021. Its main goals include searches for dark sector physics—particularly light dark matter (LDM), visible and invisible decays of dark photons (\(A{\kern 1pt} '\)), and new light particles that could explain the ⁸Be and \({{g}_{\mu }} - 2\) anomalies. Here we review these physics goals, the current status of NA64 including recent results and perspectives of further searches, as well as other ongoing or planned experiments in this field. The main theoretical results on LDM, the problem of the origin of the \(\gamma {\text{ - }}A{\kern 1pt} '\) mixing term and its connection to loop corrections, possible existence of a new light \(Z{\kern 1pt} '\) coupled to \({{L}_{\mu }} - {{L}_{\tau }}\) current are also discussed.

中文翻译：

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使用NA64搜索暗区物理

摘要

NA64实验由两个探测器组成，这些探测器计划位于CERN SPS的电子束（NA64e）和μ子束（NA64μ）上，并于2021年在大型强子对撞机长停时2之后开始运行。其主要目标包括寻找暗区物理学-特别是浅暗物质（LDM），暗光子的可见和不可见衰减（\（A {\ kern 1pt}'\）），以及可以解释⁸ Be和\（{{g} _ { \ mu}}-2 \）异常。在这里，我们回顾了这些物理目标，NA64的当前状态（包括最近的结果和进一步搜索的观点）以及该领域中正在进行的或计划中的其他实验。关于LDM的主要理论结果，\（\ gamma {\ text {-}} A {\ kern 1pt}'\）的起源问题混合项及其与环路校正的关系，可能存在与\（{{L} _ {\ mu}}-{{L} _ {\ tau}耦合的新光\（Z {\ kern 1pt}'\）} \）当前也进行了讨论。