Topics in Theoretical Physics

理论物理专题

• 批准号: 9600415
• 负责人: Carl Carlson
• 金额: $ 30万
• 依托单位: College of William and Mary
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-08-01 至 1999-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9600415&HistoricalAwards=false
• 关键词: Topics; Theoretical; Physics

We propose to investigate a number of topics in theoretical physics. One concerns the origin of the violation of time- reversal symmetry, one of the greatest mysteries in physics, and observed in decays of the K-meson. The nature of this violation isn't well understood. A particular rare decay of the K-meson is extremely sensitive to time-reversal violation, but is very difficult to detect. Recently, it has been realized that it may be measurable at TUNAF or BNL. We plan to calculate the decay rate in a wide variety of models of particle interactions. Another topic concerns neutrinos scattering off the deuteron, where more protons are produced in the forward direction than one expects. This is often attributed to rescattering in the deuterium nucleus. Relativistic effects also affect the expectations, and we wish to determine the size of these effects. This is the largest uncertainty in determining the reaction rate of neutrinos off neutrons and protons. Still another topic concerns a popular theory in particle physics, based on supersymmetry. Although most new particles predicted by supersymmetry are very heavy, there remains the possibility that one, the gluino, is light, and detectable at TUNAF and/or BNL. We've examined this previously and will work closely with experimenters in planned searchers.

我们打算研究理论物理学中的一些课题。 一个是关于时间反演对称性破坏的起源，这是物理学中最大的谜团之一，在K介子的衰变中观察到。 这种违反的性质还没有得到很好的理解。 K介子的一种特殊的衰变对时间反演破坏非常敏感，但很难检测到。 最近，人们已经认识到，它可能是可测量的，在TUNAF或BNL。 我们计划在各种各样的粒子相互作用模型中计算衰变率。 另一个主题是关于中微子从氘核散射的问题，在氘核中产生的质子比预期的要多。 这通常归因于氘原子核中的再散射。 相对论效应也会影响预期，我们希望确定这些效应的大小。 这是确定中微子与中子和质子反应速率的最大不确定性。 还有一个话题是关于粒子物理学中一个基于超对称性的流行理论。 虽然超对称性预言的大多数新粒子都非常重，但仍有一种可能性，即胶子，是轻的，并且可以在TUNAF和/或BNL检测到。 我们之前已经对此进行了研究，并将与计划搜索器中的实验者密切合作。