2026-10-15 アルゴンヌ国立研究所（ANL）
The muon EDM measured in different Fermilab data-taking periods compared with the previous Brookhaven result. The combined Fermilab value is compatible with zero (no observation). (Image: c/o Muon g-2 Collaboration)
＜関連情報＞
- https://www.anl.gov/article/muon-g2-experiment-places-new-constraints-on-a-forbidden-property-of-muons
- https://arxiv.org/abs/2608.11124
ミューオンの電気双極子モーメントに対する改良された直接制限
An improved direct limit on the muon electric dipole moment
The Muon g- Collaboration: D. P. Aguillard, T. Albahri, D. Allspach, J. Annala, K. Badgley, S. Baeßler, L. Bailey, E. Barlas-Yucel, T. Barrett, E. Barzi, F. Bedeschi, M. Berz, M. Bhattacharya, H. P. Binney, P. Bloom, J. Bono, E. Bottalico, T. Bowcock, S. Braun, M. Bressler, G. Cantatore, R. M. Carey, B. C. K. Casey, D. Cauz, R. Chakraborty, A. Chapelain, S. Chappa, S. Charity, C. Chen, M. Cheng, R. Chislett, Z. Chu, T. E. Chupp, C. Claessens, F. Confortini, M. E. Convery, S. Corrodi, L. Cotrozzi , J. D. Crnkovic , S. Dabagov , P. T. Debevec , S. Di Falco , G. Di Sciascio , S. Donati and g, B. Drendel, A. Driutti, M. Eads, A. Edmonds, J. Esquivel, M. Farooq, R. Fatemi, K. Ferraby, C. Ferrari, M. Fertl, A. T. Fienberg, A. Fioretti, D. Flay, S. B. Foster, H. Friedsam, N. S. Froemming, C. Gabbanini, I. Gaines, S. Ganguly, J. George, L. K. Gibbons, A. Gioiosa, K. L. Giovanetti, P. Girotti, W. Gohn, L. Goodenough, T. Gorringe, J. Grange, S. Grant and, F. Gray, S. Haciomeroglu, T. Halewood-Leagas, D. Hampai, F. Han, J. Hempstead, D. W. Hertzog, G. Hesketh, E. Hess, A. Hibbert, Z. Hodge, S. Y. Hoh, K. W. Hong, R. Hong, T. Hu, Y. Hu, M. Iacovacci, M. Incagli, S. Israel, P. Kammel, M. Kargiantoulakis, M. Karuza, J. Kaspar, D. Kawall, L. Kelton, A. Keshavarzi et al. (95 additional authors not shown)
arXiv Submitted on 11 Aug 2026
DOI:https://doi.org/10.48550/arXiv.2608.11124
A limit on the permanent electric dipole moment (EDM) of the positive muon is presented based on data from the Fermilab Muon g-2 Experiment taken between 2019 and 2020. The tracking detectors measure the average vertical decay angle of positrons from muon decays, enabling a search for an interaction between a possible muon EDM dμ and the lab-frame magnetic field. The result, dμ=(−0.35±0.19stat±0.34sys)×10−19 e⋅cm, is consistent with zero and sets a new direct limit on the muon EDM of |dμ|<1.10×10−19 e⋅cm at the 95 percent confidence level.
