Intermediate Energy Physics at Boston University

这3 1/2年的补助金将支持两名教师，两名博士后，三名研究生和三名本科生参加在欧洲核子研究中心，在瑞士的实验，并在布鲁克海文国家实验室的AGS质子加速器。 欧洲核子研究中心的实验以一种新的独特的方式研究-目前还不清楚-基本的CP（粒子-反粒子交换，空间反演）对称性破坏，通过使用LEAR（低能反质子环）湮灭停止的反质子来产生中性K介子和反K介子束。 对称性破坏表现在K介子衰变率的不对称性上。 数据采集阶段最近完成，数据分析将需要两年的努力。 这笔赠款的一部分是通过MPS/多学科活动办公室设备倡议提供的，以便为这项分析工作购买所需的计算机工作站和磁带驱动器。 在AGS，将使用600吨超导磁存储环进行μ子异常磁矩（g-2）的高精度测量。 该实验自1988年开始建设，今年开始数据采集. 这种测量的精度提高（20至0.35 ppm）将提供有关电弱相互作用基本理论的信息，特别是关于超对称性和可能的μ子或W玻色子子结构。这些测量补充了从非常高的能量加速器获得的测量，例如费米实验室和大型强子对撞机，现在正在欧洲核子研究中心建设中。

This 3 1/2 year grant will support two faculty, two postdoctorals, three graduate and three undergraduate students to participate in experiments at CERN, in Switzerland, and at the AGS proton accelerator at Brookhaven National Laboratory. The CERN experiment studies in a new unique way the--as yet not understood--fundamental CP (particle-antiparticle exchange, space inversion) symmetry violation, by producing beams of neutral kaons and anti- kaons by annihilation of stopped antiprotons using LEAR (Low Energy Antiproton Ring). The symmetry violation manifests itself in asymmetries in the kaon decay rates. The data taking phase was completed recently and the data analysis will require tow years of effort. Part of this grant is provided through the MPS/Office of Multidisciplinary Activities equipment initiative, allowing acquisition of needed computer workstations and tape drives for this analysis effort. At the AGS a high precision measurement of the anomalous magnetic moment (g-2) of the muon will be performed using a 600 ton superconducting magnetic storage ring. Under construction since 1988, this experiment begins data taking this year. The improved precision (factor 20 to 0.35 ppm) of this measurement will provide information regarding the fundamental theory of the electro-weak interaction, specifically with regard to supersymmetry and possible muon or W-boson substructure. These measurements complement those obtained from very high-energy accelerators, such as at Fermilab and the Large Hadron Collider, now under construction at CERN.