发表机构
School of Physics, Peking University（北京大学物理学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
BESIII实验利用最大粲数据样本搜索稀有衰变，涵盖弱衰变、味改变中性流等，未发现显著信号，并设定了多个分支比上限。
AI 中文摘要
BESIII实验利用最大的粲偶素和阈值开放粲数据样本，搜索稀有和对称性破坏的衰变。本文回顾了近期对粲偶素弱衰变、粲味改变中性流、带电轻子味破坏和玻色对称性破坏的搜索。弱衰变搜索提高了多个分支比上限，而稀有粲介子和粲偶素衰变的研究则探测味改变中性流。带电轻子味破坏的搜索在矢量和赝标量介子衰变中设定了上限，并约束了有效相互作用。所有这些搜索均未发现显著信号。中性K介子的上限低于一个提议的局域性场景的预期，而J/ψ的上限接近标准模型CP破坏所预测的量级。
英文摘要
The BESIII experiment searches for rare and symmetry-violating decays with the largest charmonium and threshold open-charm data samples. This contribution reviews recent searches for charmonium weak decays, charm flavour-changing neutral currents, charged-lepton flavour violation, and Bose-symmetry violation. The weak-decay searches have improved several branching-fraction limits, while studies of rare charm-meson and charmonium decays probe flavour-changing neutral currents. Searches for charged-lepton flavour violation set limits in vector and pseudoscalar meson decays and constrain effective interactions. No significant signals are found in any of these searches. The neutral-kaon limits fall below the expectations of a proposed locality scenario, and the $J/ψ$ limit approaches the scale predicted for Standard Model CP violation.
Comments4 figures, 2 tables. Contribution to the 14th International Workshop on e+e- collisions from Phi to Psi (PHIPSI26), 8-11 June 2026, Pisa, Italy
