Precision Muon Experiments

精密介子实验

• 批准号: 1503552
• 负责人: Tim Gorringe
• 金额: $ 55.5万
• 依托单位: University of Kentucky Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-08-15 至 2019-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1503552&HistoricalAwards=false
• 关键词: Precision; Muon; Experiments

Precise experimental tests of fundamental particle properties are now a well-established way to search for new laws of nature beyond our current physical knowledge. The proposed research is for two experiments to make precise measurements of an elementary particle called the muon, which is similar to the electron but with larger mass. One experiment at tha Fermi National Accelerator Laboratory, called g-2, will measure the magnetic moment of the muon to an accuracy of better than a part-per-million, which will provide a test of the Standard Model of particle physics, the theory that explains the properties of the elementary particles making up most of the visible matter in the Universe. The other experiment, called MuSun, at the Paul Scherrer Institute (PSI) in Switzerland will measure the lifetime of an atom comprised of a muon and a deuteron (a nucleus made from one proton and one neutron). This experiment will further the knowledge of the reaction of thermonuclear hydrogen burning which powers the sun, as well as helping to understand neutrino interactions with matter.The muon g-2 experiment will measure the muon anomalous magnetic moment to 140 parts-per-billion, a four-fold improvement over the previous experiment at Brookhaven National Laboratory (BNL), known as E821. The measurement will address the longstanding 3 standard deviation discrepancy between the same measurement from E821 and the Standard Model prediction. It represents a key test of the Standard Model and has broad sensitivity to new particles and interactions beyond the Standard Model. The muon g-2 project has involved the relocation of the muon storage ring from Brookhaven National Laboratory to Fermilab as well as new detector, electronics and acquisition systems. The PI and his group are responsible for the 8 GByte/sec calorimeter readout, using multi-teraflop GPU-based data processing, and distributed event building for the data acquisition system. The MuSun experiment will measure the mu- d to n n neutrino doublet capture rate to an accuracy of 1.5%. The measurement addresses a longstanding discrepancy among earlier measurements of mu d capture. It will provide a five-fold improvement in our knowledge of the two-body weak axial currents that plays a role in pp thermonuclear fusion, cross sections for neutrino experiments, and ordinary and double beta-decay.

现在，基本粒子特性的精确实验测试是一种良好的方法，可以在我们当前的物理知识之外寻找新的自然定律。 拟议的研究是针对两个实验，以精确测量称为MUON的基本粒子，该粒子与电子相似，但具有较大的质量。 Tha Fermi国家加速器实验室的一个实验称为G-2，将测量MUON的磁矩，比每百万的磁矩更高的精度，该实验将对粒子物理学的标准模型进行测试，该理论解释了构成宇宙中大部分可见问题的基本粒子的特性。 在瑞士的Paul Scherrer Institute（PSI）的另一个称为Musun的实验将测量由Muon和Deuteron组成的原子的寿命（一个由一个质子和一个Neutron制成的核）。 该实验将进一步了解热核氢燃烧的反应，从而为太阳提供动力，并有助于了解中微子与物质的相互作用。MUONG-2实验将测量Muon Anomoles磁矩，至140分，至140份，对Brookhaven National Laboratory（BRNL）（BNL）（bnl）（e821）的前一个实验进行了四倍的改进。该测量将解决E821与标准模型预测相同测量之间的长期3个标准偏差差异。它代表了标准模型的关键测试，并且对标准模型以外的新粒子和相互作用具有广泛的敏感性。 MUON G-2项目涉及将MUON存储环从Brookhaven国家实验室搬迁到Fermilab以及新的检测器，电子和采集系统。 PI和他的小组使用基于多Teraflop GPU的数据处理以及数据采集系统的分布式事件构建负责8 GBYTE/SEC量热仪读数。 Musun实验将测量Mu-d至N N Netrino Doublet捕获率的精度为1.5％。 该测量解决了MU D捕获的早期测量之间的长期差异。 它将为我们对两体弱轴向电流的了解提供五倍的改善，该轴向电流在PP热核融合，中微子实验的横截面以及普通和双重β-末期中起作用。