Double Polarization Reactions with Gamma Rays and CP Violation Studies With Kaon Decays

9901178Blecher可观测的宇宙包含物质，但没有反物质。对这一特点没有令人满意的解释。所有的解决方案都需要新的时间反演违反源。这意味着存在着基本粒子的看不见的反应，它们以不同的速率在时间上向前和向后进行。该计划的一个项目是在日本的KEK设施中通过正K介子衰变寻找这样的反应。中子和质子，称为核子，与电子一起构成普通物质的粒子。一个完整的定量描述其结构是必要的。通过研究极化γ射线与极化核子的相互作用，可以测量各种结构效应，并与理论进行比较。布鲁克海文国家实验室的LEGS设施开发了前所未有的极化伽马射线束，并正在开发将提供最高核子极化的HD冰靶。已经安装了一个大型接收检测器来测量这种相互作用导致的各种最终状态。

9901178BlecherThe observable universe contains matter, but no antimatter. A satisfactory explanation of this feature does not exist. All solutions require new sources of time reversal violation. This means that there exist unseen reactions of elementary particles that proceed at different rates going forward in time as compared to going backward in time. One project of this proposal is to search for such a reaction via positive kaon decay at the KEK facility in Japan.Neutrons and protons, called nucleons, are with electrons the particles that make up ordinary matter. A complete quantitative description of their structure is wanting. Via the study of the interactions of polarized gamma rays with polarized nucleons, various structure dependent effects can be measured and compared with theory. The LEGS facility of Brookhaven National Laboratory has developed gamma ray beams of unprecedented polarization, and is developing HD ice targets that will provide the highest nucleon polarization. A large acceptance detector has been installed to measure the various final states such interactions lead to.