基于 MEG II 实验的 $\mu^+\to e^+\gamma$ 衰变新限值
高能物理 - 实验
2025-07-31 v2
摘要
本文报告了在瑞士 Paul Scherrer 所器械实验室中利用 MEG II 实验对衰变 的搜索结果。该搜索灵敏度为 ，较完整 MEG 数据集的灵敏度提高了 2.4 倍，数据采集周期约为 MEG 的四分之一，归功于新探测器的卓越性能。该结果与预期背景相符，给出 分支比上限为 （90% 置信水平）。将来自 2023-2024 年的数据将进一步提升上限。数据采集将在未来几年继续进行。
引用
@article{arxiv.2504.15711,
title = {New limit on the \mu+->e+\gamma decay with the MEG II experiment},
author = {K. Afanaciev and A. M. Baldini and S. Ban and H. Benmansour and G. Boca and P. W. Cattaneo and G. Cavoto and F. Cei and M. Chiappini and A. Corvaglia and G. Dal Maso and A. De Bari and M. De Gerone and L. Ferrari Barusso and M. Francesconi and L. Galli and G. Gallucci and F. Gatti and L. Gerritzen and F. Grancagnolo and E. G. Grandoni and M. Grassi and D. N. Grigoriev and M. Hildebrandt and F. Ignatov and F. Ikeda and T. Iwamoto and S. Karpov and P. -R. Kettle and N. Khomutov and A. Kolesnikov and N. Kravchuk and V. Krylov and N. Kuchinskiy and F. Leonetti and W. Li and V. Malyshev and A. Matsushita and S. Mihara and W. Moltzon and Toshinori Mori and D. Nicolo' and H. Nishiguchi and A. Ochi and H. Ogawa and W. Ootani and A. Oya and D. Palo and M. Panareo and A. Papa and D. Pasciuto and A. Popov and F. Renga and S. Ritt and M. Rossella and A. Rozhdestvensky and S. Scarpellini and G. Signorelli and H. Suzuki and M. Takahashi and Y. Uchiyama and R. Umakoshi and A. Venturini and B. Vitali and C. Voena and K. Yamamoto and R. Yokota and T. Yonemoto},
journal= {arXiv preprint arXiv:2504.15711},
year = {2025}
}
备注
6 pages, 4 figures