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Analysis and Operations for the Precision Measurement of the Muon Anomaly

μ子异常精密测量的分析与操作

基本信息

批准号：
2110479
负责人：
Tim Gorringe
金额：
$ 52万
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：
2021
资助国家：
美国
起止时间：
2021-09-01 至 2025-08-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2110479&HistoricalAwards=false
关键词：
Analysis Operations Precision Measurement Muon

项目摘要

This award supports research by the PI with the muon g-2 experiment at Fermi National Accelerator Facility in Chicago, Illinois. The goal of the experiment is a precision measurement of the anomalous response of the muon to a strong magnetic field. The anomalous magnetic moment of the muon comes from the `quantum foam' of virtual particles that exists in empty space. The anomaly can be measured precisely and the exact result addresses an intriguing discrepancy between prior measurements and the theoretical calculation of the muon's anomalous magnetism - a discrepancy that hints at unknown forces or new particles of nature. The PI group's responsibilities within the experiment are the operation and maintenance of the experiment's data acquisition system and the data analysis for the extraction of the muon anomalous precession frequency - the measured quantity that determines the anomalous magnetism.The award provides a broader impact through the involvement and training of high school students, physics majors, graduate students and post-doctoral researchers. The group's involvement in large-scale data acquisition, analysis and modeling also exposes students to innovative computer and telecommunications technologies. Moreover, the experiment itself - involving a precision measurement of a textbook quantity - will have a broad impact and a lasting legacy in nuclear, particle and astrophysics.The muon g-2 experiment will measure the muon anomalous magnetic moment to 140 parts-per-billion; a four-fold improvement over the prior BNL E821 experiment. The measurement will address the longstanding ~3.6 standard deviation discrepancy between the previous BNL E821 measurement and the Standard Model prediction. It represents a key test of the Standard Model of Physics and has broad sensitivity to new interactions, particles and phenomenon beyond the Standard Model. The first data taking run took place from November, 2017 through July, 2018 and was published in April, 2021. This initial 460 part-per-billion measurement is in agreement with the earlier 540 part-per-billion result from the BNL E821 experiment and increased the discrepancy between experiment and standard model to 4.2 standard deviations. The team expects a factor of two improvement from the data collected in runs that have not yet been analyzed and a factor of four improvement from future runs of the experiment. This award will support continuing research involving activities in experimental operations, data acquisition and data analysis on the Fermilab g-2 experiment. The PI's group is responsible for the development and the operation of the 20 GByte/sec, 100 TFlop, g-2 data readout and processing system and its upgrades. The PI's group is also responsible for the integrated energy analysis of the muon anomalous precession frequency. This new technique for extracting the frequency uses different raw data, applies different reconstruction procedures, and inherits different systematic uncertainties, in comparison to the traditional positron counting approaches and is important to the demonstration of the robustness of the frequency measurement. Lastly, the PI will continue his overall leadership in the anomalous frequency team as an analysis coordinator.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.

该奖项支持PI在伊利诺伊州芝加哥的费米国家加速器设施进行的μ子g-2实验的研究。该实验的目标是精确测量μ介子对强磁场的异常响应。μ介子的反常磁矩来自于存在于真空中的虚粒子的“量子泡沫”。这种异常可以被精确测量，确切的结果解决了先前测量与μ子异常磁性的理论计算之间的有趣差异-这种差异暗示了未知的力量或自然界的新粒子。 PI团队在实验中的职责是操作和维护实验的数据采集系统，并进行数据分析，以提取μ子异常进动频率（确定异常磁性的测量量）。该奖项通过高中生、物理专业学生、研究生和博士后研究人员的参与和培训，产生了更广泛的影响。该小组参与大规模数据采集，分析和建模也使学生接触到创新的计算机和电信技术。此外，该实验本身--涉及对教科书数量的精确测量--将在核、粒子和天体物理学领域产生广泛的影响和持久的遗产。μ子g-2实验将测量μ子异常磁矩至140十亿分之一;比之前的BNL E821实验提高了四倍。测量将解决之前BNL E821测量和标准模型预测之间长期存在的~3.6标准差差异。它代表了物理学标准模型的关键测试，对标准模型之外的新相互作用，粒子和现象具有广泛的敏感性。第一次数据运行时间为2017年11月至2018年7月，并于2021年4月发布。这个最初的460 ppm测量值与BNL E821实验的540 ppm结果一致，并将实验和标准模型之间的差异增加到4.2个标准差。该团队希望从尚未分析的运行中收集的数据中获得两倍的改进，并从未来的实验运行中获得四倍的改进。该奖项将支持继续进行研究，包括费米实验室g-2实验的实验操作，数据采集和数据分析活动。PI的团队负责20 GByte/sec，100 TFlop，g-2数据读出和处理系统及其升级的开发和操作。PI的小组还负责μ子异常进动频率的综合能量分析。与传统的正电子计数方法相比，这种用于提取频率的新技术使用不同的原始数据，应用不同的重建程序，并且继承不同的系统不确定性，并且对于证明频率测量的鲁棒性是重要的。最后，PI将继续作为分析协调员全面领导异常频率团队。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。