Elementary Particle Physics

本提案请求对费米实验室FOCUS （E831）合作项目产生的数据分析提供支持。这些数据包括迄今为止记录的最大的魅力衰变样本，比该光谱仪之前的运行增加了15倍。该光谱仪具有出色的顶点和颗粒识别功能，这两项功能都是在早期运行经验的基础上进行改进和升级的。范德比尔特小组对介子识别进行了升级，他们承担了一个新的外部介子系统的构建、操作、解释和模拟的主要责任。这个小组还负责实现多重触发器。新的数据集应该允许研究标准模型之外的物理主题，例如通过半光子衰变的d - 0 - d - 0棒混合，稀有和禁止的粲子衰变（改变口味的中性电流，轻子数违反和轻子族数违反衰变），以及CP违反粲子衰变。该小组还参与了费米实验室C0区域BTeV计划的研发工作，该计划旨在作为第三代B物理实验，特别是PI已被选中领导μ子探测器的工作。

9972073SheldonThis proposal requests support for the analysis of data produced by the FOCUS (E831) collaboration at Fermilab. The data include the largest sample of charm decays recorded to date, an increase of a factor of fifteen over the previous run with this spectrometer. The spectrometer features excellent vertexing and particle identification, both of which had been refined and upgraded on the basis of experience with earlier runs. Muon identification was upgraded by the Vanderbilt group which assumed primary responsibility for construction, operation, interpretation, and simulation of a new outer muon system. This group was also responsible for implementation of the multiplicity trigger. The new data set should allow investigation of physics topics beyond the Standard Model, such as D-zero D-zero-bar mixing via semileptonic decays, rare and forbidden charm decays (flavor changing neutral currents, lepton number violating, and lepton family number violating decays), and CP violating charm decays. This group is also involved in R&D work on the proposed BTeV program in region C0 at Fermilab, which is intended as a third generation B physics experiment, in particular the PI has been selected to lead the muon detector effort.