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Search for the rare decay mü ---> eee with a high rate experiment based on thin Monolithic Active Pixel Sensors

通过基于薄型单片有源像素传感器的高速实验寻找罕见的衰变 mü ---> eee

基本信息

批准号：
212235208
负责人：
Professor Dr. Niklaus Berger
金额：
--
依托单位：
Institut für Kernphysik
依托单位国家：
德国
项目类别：
Independent Junior Research Groups
财政年份：
2012
资助国家：
德国
起止时间：
2011-12-31 至 2018-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/212235208?language=en
关键词：
Search rare decay eee rate

项目摘要

The standard model of elementary particle physics encompasses three electron-like particles (the electron, the muon and the tau) and three neutrinos, together known as leptons. It was long believed that the number of leptons of each kind (flavour ) is conserved. Since the discovery of neutrino oscillations it is known that this is not the case; transitions violating charged lepton flavour have however so far eluded detection. The mechanism for and size of lepton flavour violating interactions are of great interest, as they are linked to the generation of neutrino masses, CP violation and new physics beyond the standard model. This project is for an experiment searching for the lepton flavour violating transition μ+ → e+e−e+ with a sensitivity of one in 1016 μ decays. In order to reach that sensitivity, the momenta of the decay electrons from up to a billion μ decays per second have to be precisely reconstructed by a detector built from thin silicon high-voltage monolithic active pixel sensors (HV-MAPS). This project encompasses the design, construction and operation of such a detector (the first of its kind), with a focus on the associated electronics and on-line track reconstruction methods implemented on powerful electronics components such as Field Programmable Gate Arrays (FPGAs) and Graphics Processing Units (GPUs).

基本粒子物理学的标准模型包括三个类电子粒子（电子、介子和τ）和三个中微子，它们合在一起被称为轻子。长期以来，人们一直认为每种轻子（味道）的数量是守恒的。自从发现中微子振荡以来，我们知道情况并非如此；然而，到目前为止，违反带电轻子味道的跃迁还没有被发现。轻子味违反相互作用的机制和大小引起了极大的兴趣，因为它们与中微子质量的产生、CP违反和超越标准模型的新物理学有关。本课题是寻找违反μ+→e+e−e+跃迁的轻子味的实验，灵敏度为1 / 1016 μ衰变。为了达到这种灵敏度，每秒高达10亿μ衰减的衰变电子的动量必须由由薄硅高压单片有源像素传感器（HV-MAPS）制成的探测器精确重建。该项目包括设计、建造和操作这样一个探测器（同类中的第一个），重点是在强大的电子元件上实现的相关电子和在线轨道重建方法，如现场可编程门阵列（fpga）和图形处理单元（gpu）。