Precision Measurement of the Muon Anomalous Magnetic Moment

该奖项支持继续开展研究活动，以精确测量一种名为Muon的基本粒子的特征，这种粒子类似于电子，但质量更大。这项实验在伊利诺伊州芝加哥附近的费米国家加速器设施(Fermilab)进行。现在，对基本粒子性质进行精确的实验测试是一种成熟的方法，可以在我们目前的物理知识之外寻找新的自然规律。这项测量将解决先前测量和标准模型预测的Muon？S特性之间的有趣差异，并且对新粒子和未检测到的力非常敏感，这些新粒子和未检测到的力是对高能对撞机和其他地方的其他工作的独特补充。PI将继续让高中生、物理专业的学生、研究生和博士后研究人员参与研究活动。该小组参与的高性能数据采集、分析和模拟将使学生接触到创新计算机和电信技术的许多方面。介子g-2实验将测量到140 ppb的介子反常磁矩；比之前的BNL E821实验提高了四倍。该测量将解决之前的BNL E821测量与标准模型预测之间存在的约3.5西格玛的长期差异。它代表了标准模型的一项关键测试，并对标准模型以外的新粒子和相互作用具有广泛的敏感性。它补充了在能量、强度和宇宙前沿对新物理学的其他探索。Muon g-2项目涉及将E821 Muon存储环从布鲁克海文国家实验室迁至费米实验室，并对探测器、电子设备和采集子系统进行了重大升级。在费米实验室Muon园区安装存储环及其相关仪器的工作已于2017年完成。第一次数据运行发生在2017年11月至2018年7月，已经超过了之前的BNL E821的统计数据。未来三年的另外两个主要运行期应该可以实现收集约21倍于BNL E821的统计数据的目标。PI的小组一直是，并将继续是20 Gbyte/sec，100 TFLOP，g-2数据读出和处理系统以及Q方法确定异常进动频率的基础设施、分析和模拟工作的领导者。该小组总努力的大约三分之一将与数据获取责任相关，三分之二与Q方法分析责任相关。这一奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

This award supports continuing research activities to precisely measure characteristics of an elementary particle called the muon, which is similar to the electron but with larger mass. The experiment takes place at Fermi National Accelerator Facility (Fermilab) near Chicago, Illinois. 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 measurement will address an intriguing discrepancy between a prior measurement and the Standard Model prediction of the muon?s characteristics and is sensitive to new particles and undetected forces that uniquely complement other efforts at high energy colliders and elsewhere. The PI will continue his involvement of high school students, physics majors, graduate students and post-doctoral researchers in research activities. The group's involvement in high-performance data acquisition, analysis and simulations will expose students to many aspects of innovative computer and telecommunications technology. The muon g-2 experiment will measure the muon anomalous magnetic moment to 140 ppb; a four-fold improvement over the prior BNL E821 experiment. The measurement will address the longstanding discrepancy of ~3.5 sigma between the previous BNL E821 measurement 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. It complements other searches for new physics at the energy, intensity and cosmic frontiers. The muon g-2 project has involved the relocation of the E821 muon storage ring from Brookhaven National Laboratory to Fermilab as well as major upgrades of the detector, electronics and acquisition sub-systems. The installation of the storage ring and its associated instrumentation on the Fermilab muon campus was completed in 2017. The first data taking run took place from November, 2017 to July, 2018 and has already exceeded the statistics of prior BNL E821. Two further majo running periods over the next three years should achieve the goals of collecting about 21 times the statistics of BNL E821. The PI's group has been, and continues to be, the lead for both the 20 GByte/sec, 100 TFlop, g-2 data readout and processing system and the infrastructure, analysis and simulation effort for the Q-method determination of the anomalous precession frequency. About one third of the group's overall effort will be associated with data acquisition responsibilities and two thirds of the overall effort associated with Q-method analysis responsibilities.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.