论文标题
I阶段MU3E实验的技术设计
Technical design of the phase I Mu3e experiment
论文作者
论文摘要
MU3E实验旨在查找或排除违反衰减的Lepton风味$μ\ rightarrow eee $,以$ 10^{ - 16} $以上的分支分数。实验的第一阶段使用Paul Scherrer Institute(PSI)现有的梁线的第一阶段旨在达到$ 2 \ cdot 10^{ - 15} $的单个事件灵敏度。我们概述了阶段〜I MU3E检测器的技术设计和预期性能的各个方面。高达$ 10^{8} $ MUON每秒衰减的高速度,而衰减电子和正负声的低动量构成了一套独特的挑战,我们使用基于高压单体单体主动像素传感器的超薄跟踪探测器来解决这些挑战。
The Mu3e experiment aims to find or exclude the lepton flavour violating decay $μ\rightarrow eee$ at branching fractions above $10^{-16}$. A first phase of the experiment using an existing beamline at the Paul Scherrer Institute (PSI) is designed to reach a single event sensitivity of $2\cdot 10^{-15}$. We present an overview of all aspects of the technical design and expected performance of the phase~I Mu3e detector. The high rate of up to $10^{8}$ muon decays per second and the low momenta of the decay electrons and positrons pose a unique set of challenges, which we tackle using an ultra thin tracking detector based on high-voltage monolithic active pixel sensors combined with scintillating fibres and tiles for precise timing measurements.