Coordination Funds

协调基金

• 批准号: 460653163
• 负责人: Professor Dr. André Schöning
• 金额: --
• 依托单位: Physikalisches Institut
• 依托单位国家: 德国
• 项目类别: Research Units
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/460653163?language=en
• 关键词: Coordination; Funds

The project aims to set up a DFG-Research Unit for all German groups participating in the Mu3e experiment (Heidelberg, Karlsruhe and Mainz).With the Mu3e experiment we aim to search for the rare decay μ → eee with an ultimate sensitivity of less than B(Gamma -> eee) < 1E-16. This decay is allowed in the extended Standard Model (SM) of particle physics (with massive neutrinos), albeitan extremely small decay rate of << 1E-56 is predicted, which is why this decay is within the SM virtually unobservable. The discovery of this lepton flavor violating (LFV) decay would therefore manifest the existence of new physics beyond the SM.LFV processes are predicted by a variety of models beyond the SM. These include supersymmetry, Little Higgs models, models with extra (compactified) space dimensions, or grand unification theories. It is therefore not surprising that several groups around the world are preparing different experiments to search for LFV processes.The current experimental exclusion limit for the decay Gamma -> eee comes from the SINDRUM experiment, which was performed more than 30 years ago, and is B(Gamma -> eee) <1E-12 (90% confidence level). The Mu3e experiment thus ultimately seeks to improve the sensitivity by four orders of magnitude.In a first phase (Phase I), the Mu3e experiment will be performed at the PiE5 beamline at the Paul-Scherrer Institute (PSI, Switzerland), which provides a pure high-intensity muon beam. For phase I, a sensitivity of B(fgamma -> eee) < 5E-15 is expected after about 3 years of running time. Phase II will require a new, even more intense beamline, which is currently in the planning stage.Within the proposed Research Unit the German Mu3e groups plan to setup, commission and operate the Mu3e Phase I experiment. The German groups have been instrumental in the preparation of the experiment and plan to take responsibility for major components of the detector. These include the tracking detector build from modern monolithic silicon pixel sensors, the scintillation counters for precise timing, and the data acquisition system including a GPU-based processor farm.

该项目旨在为所有参与Mu 3e实验的德国团体（海德堡，卡尔斯鲁厄和美因茨）建立DFG研究单位。通过Mu 3e实验，我们的目标是寻找极限灵敏度小于B（伽马-> γ）<1 E-16的稀有衰变μ → γ。这种衰变在粒子物理学的扩展标准模型（SM）中是允许的（有大质量中微子），爱因斯坦的衰变率被预测为<<1 E-56，这就是为什么这种衰变在SM中几乎是不可观测的。这种轻子味违反（LFV）衰变的发现，因此，将表明存在新的物理超越SM。LFV过程被预测的各种模型超越SM。这些包括超对称性，小希格斯模型，具有额外（紧致化）空间维度的模型，或大统一理论。因此，世界上有几个小组正在准备不同的实验来寻找LFV过程也就不足为奇了。目前伽马-> γ衰变的实验排除极限来自30多年前进行的SINDRUM实验，为B（伽马-> γ）<1 E-12（90%置信水平）。在第一阶段（第一阶段），Mu 3e实验将在瑞士保罗-谢勒研究所（PSI）的PiE 5光束线上进行，该光束线提供了纯的高强度μ子光束。对于阶段I，在大约3年的运行时间之后，预期灵敏度为B（fgamma -> λ）< 5E-15。第二阶段将需要一个新的，甚至更强的光束线，目前正在规划阶段。在拟议的研究单位内，德国Mu 3e小组计划设置，委托和操作Mu 3e第一阶段实验。德国小组在实验的准备工作中发挥了重要作用，并计划负责探测器的主要部件。这些包括由现代单片硅像素传感器构建的跟踪探测器，用于精确计时的闪烁计数器，以及包括基于GPU的处理器群的数据采集系统。