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arXiv 2009.07709physics.acc-phhep-ex
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从μ子$g\textrm{-}2$实验走向粒子物理学的前沿

Toward the Frontiers of Particle Physics With the Muon $g\textrm{-}2$ Experiment

Eremey Valetov

摘要:

费米实验室的μ子$g\textrm{-}2$实验(E989)的目标是使用正μ子以前所未有的精度测量μ子异常($a_μ$)。这一测量的动机是先前布鲁克海文$a_μ$测量和标准模型预测之间的差异超过三个标准差,这暗示了物理学超越标准模型的可能性。μ子在储存环中循环,测量需要从用量热计收集的衰变正电子时间和能量测量中精确确定μ子异常进动频率(自旋进动相对于动量)。需要以高精度知道μ子所看到的平均磁场,因此存储环磁场被调整为非常均匀,并且用核磁共振(NMR)探针持续监测。在确定μ子异常岁差频率(例如测量窗口期间的μ子损失)时,还需要详细的μ子Campus束线和μ子存储环模拟来量化束流动力学和自旋相关的系统效应。在会议召开时,该实验最近开始了Run-3,并计划在2020年发布Run-1物理结果。

英文摘要:

The Muon $g\textrm{-}2$ Experiment (E989) at Fermilab has a goal of measuring the muon anomaly ($a_μ$) with unprecedented precision using positive muons. This measurement is motivated by the difference between the previous Brookhaven $a_μ$ measurement and Standard Model prediction exceeding three standard deviations, which hints at the possibility of physics beyond the Standard Model. Muons are circulated in a storage ring, and the measurement requires a precise determination of the muon anomalous precession frequency (spin precession relative to momentum) from the resulting decay positron time and energy measurements collected with calorimeters. The average magnetic field seen by the muons needs to be known with high precision, and so the storage ring magnetic field is shimmed to be very uniform and is continually monitored with nuclear magnetic resonance (NMR) probes. Detailed Muon Campus beamline and muon storage ring simulations are also required for quantifying beam dynamics and spin-related systematic effects in the determination of the muon anomalous precession frequency, e.g. muon losses during the measurement window. At the time of the conference, the experiment has recently commenced Run-3, and the release of Run-1 physics results is planned for 2020.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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