Interactions of Kaons, Other Hadrons, and Electrons

*9803848埃克豪斯威廉和玛丽小组与加州大学欧文分校、UTAustin大学、斯坦福大学和里士满大学的合作者一起，计划继续以高灵敏度搜索长寿命中性K介子罕见的双轻子衰变。其中包括轻子非守恒衰变到一个µ子和一个电子，以及味道变化的中性电流衰变到一个Muon-反uon对和一个电子-正电子对。这项名为实验E871的工作是在布鲁克海文国家实验室的AGS设备中进行的。根据现有数据，单事件灵敏度的水平为一万亿分之一到两个比例的目标似乎触手可及。目前正在进行的一项广泛的分析揭示了首次观测到的双电子事件。使用E871探测器，加州大学欧文分校、里士满大学和威廉和玛丽也进行了一项单独的实验E935，试图探测低质量胶子的证据。具体地说，研究了一个长寿命的胶子-胶子强子衰变为一对带电的介子和一个光子子的过程。然后，可以对超对称粒子理论的低质量伽吉诺情景施加限制。在过去的五年里，三名威廉和玛丽的研究生在这项工作的基础上写了他们的博士论文。此外，该项目还产生了七篇本科生高级荣誉研究论文。威廉和玛丽集团对本科生和研究生教育的这一承诺将在未来继续下去。***

***9803848EckhauseThe William and Mary group, in conjunction with collaborators from UCIrvine, UTAustin, Stanford U, and Richmond U, plans to continue its program of searching at high sensitivity for the rare dilepton decays of the long-lived neutral K meson. These include the lepton-nonconserving decay to a muon and an electron, and the flavor-changing neutral current decays to a muon-antimuon pair and to an electron-positron pair. This work, Experiment E871, is carried out at the AGS Facility of the Brookhaven National Laboratory. The objective of single-event sensitivity at a level of one-to-two parts in a thousand billion appears within reach based upon available data. An extensive analysis now in progress has revealed the first observation of di-electron events. Using the E871 detector a separate experiment E935 has also been run by UCIrvine, Richmond U, and William and Mary which attempts to probe for evidence of a low mass gluon. Specifically a search is made for the decay of a long-lived gluon-gluino hadron to a pair of charged pions and a photino. Limits can then be placed on a low mass gaugino scenario of supersymmetric particle theory. Within the past five years three William and Mary graduate students have written their Ph.D. dissertations based on this work. In addition this program has led to seven undergraduate senior honors research theses. This commitment to education by the William and Mary group at both the undergraduate and graduate levels will continue in the future. ***