标题： 为什么我们现在需要新的BNL muon g-2实验？ 显示英文标题

标题： Why do we need the new BNL muon g-2 experiment now?

摘要： CMD-2和SND正负电子湮没实验的新最终结果，连同BaBar的辐射返回测量，导致标准模型对μ子异常预测的近期改进。0.48 ppm的不确定性——一个主要由数据驱动的结果——现在略低于0.54 ppm的实验不确定性。差异a_mu(expt)- a_mu(SM) = (27.6 ± 8.4) × 10^-10，代表了3.3个标准偏差的影响。在这个水平上，这是超越标准模型物理的一个最引人注目的指标之一，至少是对超对称性（SUSY）或额外维度等推测性新理论的重大约束。本研讨会的其他人详细介绍了标准模型理论对a_mu进一步改进的计划。在这里，我概述了BNL E969如何实现实验不确定性的两倍或更多减少。新实验基于一种经过验证的技术和记录。我主张这项工作必须立即开始，以对预期在LHC发现的新物理产生最大影响。 显示英文摘要

摘要： New final results from the CMD-2 and SND e+e- annihilation experiments, together with radiative return measurements from BaBar, lead to recent improvements in the standard model prediction for the muon anomaly. The uncertainty at 0.48 ppm--a largely data-driven result--is now slightly below the experimental uncertainty of 0.54 ppm. The difference, a_mu(expt)- a_mu(SM) = (27.6 +/- 8.4) x 10^-10, represents a 3.3 standard deviation effect. At this level, it is one of the most compelling indicators of physics beyond the standard model and, at the very least, a major constraint for speculative new theories such as SUSY or extra dimensions. Others at this Workshop detailed further planned standard model theory improvements to a_mu. Here I outline how BNL E969 will achieve a factor of 2 or more reduction in the experimental uncertainty. The new experiment is based on a proven technique and track record. I argue that this work must be started now to have maximal impact on the interpretation of the new physics anticipated to be unearthed at the LHC.