First Experimental Limit on the Permanent Electric Dipole Moment of the Deuteron
Abstract
Permanent electric dipole moments (EDMs) provide a sensitive probe of physics beyond the Standard Model and are directly linked to additional sources of CP violation that could explain the matter-antimatter asymmetry of the universe. EDM measurements of charged particles in storage rings rely on detecting a small tilt of the invariant spin axis with respect to the ring plane. In this work, we present the experimental determination of the invariant spin axis of an ensemble of deuterons in the COoler SYnchrotron (COSY), a conventional magnetic storage ring, using a combination of a radio-frequency Wien filter, a superconducting Siberian snake and an electron-cooler solenoid. The measurements reveal tilts of a few milliradians, which are dominated by systematic effects. From the observed tilts, we derive the first experimental limit on the deuteron EDM, . This result demonstrates the feasibility of using storage rings to search for EDMs of charged stable hadrons and provides a foundation for future dedicated facilities.
Cite
@article{arxiv.2602.20828,
title = {First Experimental Limit on the Permanent Electric Dipole Moment of the Deuteron},
author = {A. Andres and V. Hejny and A. Nass and N. N. Nikolaev and J. Pretz and F. Rathmann and V. Shmakova and J. Slim and F. Abusaif and A. Aggarwal and A. Aksentev and B. Alberdi and L. Barion and I. Bekman and M. Beyß and C. Böhme and B. Breitkreutz and N. Canale and G. Ciullo and S. Dymov and N. -O. Fröhlich and R. Gebel and M. Gaisser and K. Grigoryev and D. Grzonka and D. Gu and D. Heberling and J. Hetzel and D. Hölscher and O. Javakhishvili and A. Kacharava and V. Kamerdzhiev and S. Karanth and I. Keshelashvili and A. Kononov and K. Laihem and A. Lehrach and P. Lenisa and N. Lomidze and B. Lorentz and G. Macharashvili and A. Magiera and M. Margos and D. Mchedlishvili and A. Melnikov and F. Müller and D. Okropiridze and A. Pesce and A. Piccoli and V. Poncza and D. Prasuhn and A. Saleev and D. Shergelashvili and R. Shankar and N. Shurkhno and S. Siddique and A. Silenko and H. Soltner and R. Stassen and E. J. Stephenson and H. Ströher and M. Tabidze and G. Tagliente and V. Tempel and Y. Valdau and M. Vitz and T. Wagner and A. Wirzba and A. Wrońska and P. Wüstner and M. Żurek},
journal= {arXiv preprint arXiv:2602.20828},
year = {2026}
}
Comments
9 pages, 4 figures