The Mu3e Experiment Searching for the Lepton Flavour Violating Decay μ+ → e+e+e−

Afaf Wasili
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引用次数: 2

Abstract

The Mu3e experiment is a novel experiment to search for the lepton flavour violating (LFV) decay μ+ → e+e−e+, with an ultimate sensitivity to a branching ratio of one in 2×10^15 in phase I and one in 10^16 muon decays for phase II. This is an improvement in sensitivity by four orders of magnitude compared to previous searches by the SINDRUM experiment. Since this decay is suppressed to unobservable levels in the Standard Model of particle physics, any measurement of this decay would be a clear sign of new physics. The experiment is currently under construction and will take place at the Paul Scherrer Institute in Switzerland. In order to achieve this number of muon decays, the Paul Scherrer Institute (PSI) is utilizing the worlds most intense proton beam, which is used to produce very intense 10^8 μ/s at πE5 beamline (phase I) and a new high-intensity muon beam line HiMB is providing 10^9 μ/s (phase II). To achieve the proposed sensitivity, the Mu3e experiment requires excellent vertex, timing and momentum resolutions. These are needed to reduce the main background processes, such as Internal conversion and accidental coincidences caused by two or more Michel decays. This paper will present an overview of the Mu3e experiment with the performance of the phase I Mu3e detector, and how this sensitivity is achieved by high voltage monolithic active pixel sensors for high spatial resolution and scintillating fibres and tiles providing precise timing information at high particle rates.
寻找违反衰变μ+→e+e+e−的轻子味的Mu3e实验
Mu3e实验是一种寻找μ+→e+e−e+轻子风味破坏(LFV)衰变的新实验,在第一阶段的分支比为1 / 2×10^15,在第二阶段为1 / 10^16。与先前SINDRUM实验的搜索相比,这是灵敏度提高了四个数量级。由于这种衰变在粒子物理学的标准模型中被抑制到不可观察的水平,任何对这种衰变的测量都将是新物理学的明显标志。该实验目前正在建设中,将在瑞士的保罗·谢勒研究所进行。为了达到这一目标,Paul Scherrer研究所(PSI)正在使用世界上最强的质子束,该质子束在π - e5光束线(相位1)上产生10^8 μ/s的极强质子束,而新的高强度μ子光束线HiMB则提供10^9 μ/s(相位2)。为了达到所提出的灵敏度,Mu3e实验需要出色的顶点、时间和动量分辨率。这些都需要减少主要的背景过程,如内部转换和由两个或多个米歇尔衰变引起的偶然巧合。本文将概述Mu3e实验与相位1 Mu3e探测器的性能,以及如何通过高压单片有源像素传感器实现高空间分辨率和闪烁光纤和瓦片,以高粒子速率提供精确的定时信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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