发表机构
College of Physics, Jilin University（吉林大学物理学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文回顾Belle和Belle II实验利用世界最大e+e-对撞数据，对τ轻子、B介子及底偶素态电荷轻子味破坏衰变的最新搜寻结果。
AI 中文摘要
电荷轻子味破坏（CLFV）在标准模型（SM）中因无质量中微子及不存在右手中微子而被禁止。中微子振荡的发现证实了中微子具有质量，且轻子味并非自然界的精确对称性。引入右手中微子的SM最小扩展可通过涉及中微子的圈图产生CLFV。然而，此类过程极为罕见，例如$\mu \to e\gamma$的分支比预计在$10^{-54}$量级，远超当前对撞机实验的灵敏度。相比之下，若干新物理模型预测的CLFV衰变率处于当前实验灵敏度范围内，如Belle和Belle II实验，它们已在$\Upsilon(4S)$共振附近收集了世界上最大的不对称$e^+e^-$对撞数据。这些大数据样本被用于探索$\tau$轻子、$B$介子及底偶素态的CLFV衰变可能性。本报告回顾了Belle和Belle II实验在这些CLFV衰变方面的一些最新结果。
英文摘要
Charged lepton flavor violation (CLFV) is forbidden in the Standard Model (SM) due to massless neutrinos and absence of right-handed neutrinos. The discovery of neutrino oscillations established that the neutrinos are massive and the lepton flavor is not an exact symmetry of nature. A minimal extension of the SM that incorporates right-handed neutrinos gives rise to CLFV through loop-level diagrams involving neutrinos. However, such processes are extremely rare, for instance, the branching fraction of $μ\to eγ$ is expected to be at the level of $10^{-54}$, far beyond the sensitivity of current collider experiments. In contrast, several new physics models predict CLFV decay rates within the sensitivity of current experiments, such as the Belle and Belle II experiments, which have collected the world's largest asymmetric $e^+e^-$ collision data near the $Υ(4S)$ resonance. The large data sample has utilized to explore the possibility of CLFV decays of $τ$ leptons, $B$ mesons, and bottomonium states. The report reviews some latest results on these CLFV decays at Belle and Belle II.
Comments13 pages, 4 figures, Proceedings of the CLFV-2026 conference
