从yeV到TeV：寻找中子电偶极矩
From yeV to TeV: Search for the Neutron Electric Dipole Moment
摘要：
基本粒子的电偶极矩（EDM）的存在标志着时间反演对称性（T）的破坏伴随着宇称（P）的破坏;迄今为止，只有上限已经确定。在CPT是良好对称性的假设下，时间反演破坏又意味着CP破坏。中子是EDM搜索的一个有吸引力的系统，这既是因为它是中性的，也是因为中子EDM比原子核甚至原子的可比量相对更容易解释。我们简要介绍了这种搜索的关键实验要求，并描述了一些方面的中子EDM实验计划的Sputterus中子源在美国橡树岭国家实验室。
英文摘要：
The existence of electric dipole moments (EDM) for fundamental particles signals time-reversal symmetry (T) violation accompanied by violation of parity (P); only upper limits have been established to date. Time-reversal violation in turn implies CP violation under the assumption that CPT is a good symmetry. The neutron is an attractive system for an EDM search, both because it is neu- tral and because a neutron EDM would be relatively easier to interpret than the comparable quantity for a nucleus or even an atom. We introduce briefly the key experimental requirements for such search and describe some aspects of the neutron EDM experiment planned for the Spallation Neutron Source at the U.S. Oak Ridge National Laboratory.
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