η/η´介子衰变中基本对称性的检验

The search for new physics beyond the Standard Model has been attracted many attentions these years, while the rare decays of η/η´ offer us a unique and ideal laboratory to test the fundamental symmetries, e.g, C,P and CP. Using the 1.3 billion J/ψ events taken at the BESIII detector, we plan to perform a full study of η/η´ rare decays (e.g., the CP violating decays η/η´→ππ and C violating decays η/η´→π0e+e-) via J/ψ→γη/η´and present the best limits for the test of these fundamental symmetries.

寻找超出标准模型的新物理一直备受关注，而η/η´稀有衰变为我们提供了理想的实验场所。利用北京谱仪III实验上所采集的13亿J/ψ事例，本项目将通过J/ψ→γη/η´系统研究η和η´的稀有衰变，如CP破坏过程η/η´→ππ和C破坏过程η/η´→π0e+e- 等，给出它们的分支比上限，精确检验 C、P和CP对称性。