标题： 使用介子衰变中缪子极化不对称性检验标准模型 显示英文标题

标题： Tests of the Standard Model Using Muon Polarization Asymmetries in Kaon Decays

摘要： 我们已经研究了在各种K介子衰变过程中测量末态缪子极化的物理和实验可行性。 从这些测量中可以获得关于CP破坏、夸克混合（CKM）矩阵和新物理的有价值信息。 我们考虑了K_L到mu+ mu-和K到pi mu+ mu-衰变中的缪子极化。 尽管这些效应很小，或者由于涉及的小分支比而难以测量，但这些研究可以提供对CKM参数的清晰测量。 实验难度似乎与观察K到pi nu barnu相当。 涉及非标准CP破坏的新物理来源可能在这些测量中产生可观测效应。 来自中子和电子电偶极矩新结果以及中性K介子衰变中epsilon-prime over epsilon的限制，并未排除某些可能对信号有贡献的模型。 对KMU3和辐射KMU2衰变中衰变平面外的缪子极化的详细研究似乎也具有兴趣。 利用当前的K介子束流和探测器技术，有可能测量KMU3的T破坏极化，其不确定性接近0.0001。 这种灵敏度水平将为新物理提供一个有趣的探测手段。 显示英文摘要

摘要： We have examined the physics and the experimental feasibility of studying various kaon decay processes in which the polarization of a muon in the final state is measured. Valuable information on CP violation, the quark mixing (CKM) matrix, and new physics can be obtained from such measurements. We have considered muon polarization in K_L to mu+ mu- and K to pi mu+ mu- decays. Although the effects are small, or difficult to measure because of the small branching ratios involved, these studies could provide clean measurements of the CKM parameters. The experimental difficulty appears comparable to the observation of K to pi nu barnu. New sources of physics, involving non-standard CP violation, could produce effects observable in these measurements. Limits from new results on the neutron and electron electric dipole moment, and epsilon-prime over epsilon in neutral kaon decays, do not eliminate certain models that could contribute to the signal. A detailed examination of muon polarization out of the decay plane in KMU3 and radiative KMU2 decays also appears to be of interest. With current kaon beams and detector techniques, it is possible to measure the T-violating polarization for KMU3 with uncertainties approaching 0.0001. This level of sensitivity would provide an interesting probe of new physics.